The compact and, with \ M\, very massive object located at the center of the Milky Way is currently the very best candidate for a supermassive black hole in our immediate vicinity. The strongest evidence for this is provided by measurements of stellar orbits, variable X-ray emission, and strongly variable polarized near-infrared emission from the location of the radio source Sagittarius A* in the middle of the central stellar cluster. Simultaneous near-infrared and X-ray observations of SgrA* have revealed insights into (...) the emission mechanisms responsible for the powerful near-infrared and X-ray flares from within a few tens to one hundred Schwarzschild radii of such a putative SMBH. If SgrA* is indeed a SMBH it will, in projection onto the sky, have the largest event horizon and will certainly be the first and most important target for very long baseline interferometry observations currently being prepared by the event horizon telescope. These observations in combination with the infrared interferometry experiment GRAVITY at the very large telescope interferometer and other experiments across the electromagnetic spectrum might yield proof for the presence of a black hole at the center of the Milky Way. The large body of evidence continues to discriminate the identification of SgrA* as a SMBH from alternative possibilities. It is, however, unclear when the ever mounting evidence for SgrA* being associated with a SMBH will suffice as a convincing proof. Additional compelling evidence may come from future gravitational wave observatories. This manuscript reviews the observational facts, theoretical grounds and conceptual aspects for the case of SgrA* being a black hole. We treat theory and observations in the framework of the philosophical discussions about “realism and underdetermination”, as this line of arguments allows us to describe the situation in observational astrophysics with respect to supermassive black holes. Questions concerning the existence of supermassive black holes and in particular SgrA* are discussed using causation as an indispensable element. We show that the results of our investigation are convincingly mapped out by this combination of concepts. (shrink)

This is an open access book. This book, the first edited collection of its kind, explores the recent emergence of philosophical research in astrophysics. It assembles a variety of original essays from scholars who are currently shaping this field, and it combines insightful overviews of the current state of play with novel, significant contributions. It therefore provides an ideal source for understanding the current debates in philosophy of astrophysics, and it offers new ideas for future cutting-edge research. The (...) selection of essays offered in this book addresses methodological and metaphysical questions that target a wide range of topics, including dark matter, black holes, astrophysical observations and modelling. The book serves as the first standard resource in philosophy of astrophysics for all scholars who work in the field and want to expand or deepen their knowledge, but it also provides an accessible guide for all those philosophers and scientists who are interested in getting a first, basic understanding of the main issues in philosophy of astrophysics. (shrink)

Astrophysics is often cast as an observational science, devoid of traditional experiments, along with astronomy and cosmology. Yet, a thriving field of experimental research exists called laboratory astrophysics. How should we make sense of this apparent tension? I argue that approaching the epistemology of astrophysics by attending to the production of empirical data and the aims of the research better illuminates both the successes and challenges of empirical research in astrophysics than evaluating the epistemology of (...) class='Hi'>astrophysics according to the presence or absence of experiments. (shrink)

Evidence for instances of astrophysical 'fine tuning' (or 'coincidences') is thought by some to lend support to the design argument (i.e. the argument that our universe has been designed by some deity). We assess some of the relevant empirical and conceptual issues. We argue that astrophysical fine tuning calls for some explanation, but this explanation need not appeal to the design argument. A clear and strict separation of the issue of anthropic fine tuning on one hand and any form of (...) Eddingtonian numerology and teleology on the other, may help clarify arguably the most significant issue in the philosophy of cosmology. (shrink)

Evidence for instances of astrophysical ‘fine tuning’ (or ‘coincidences’) is thought by some to lend support to the design argument (i.e. the argument that our universe has been designed by some deity). We assess some of the relevant empirical and conceptual issues. We argue that astrophysical fine tuning calls for some explanation, but this explanation need not appeal to the design argument. A clear and strict separation of the issue of anthropic fine tuning on one hand and any form of (...) Eddingtonian numerology and teleology on the other, may help clarify arguably the most significant issue in the philosophy of cosmology. (shrink)

I explore how the notion of divine creation could be made understandable in a worldview dominated by empirical science. The crucial question concerns the empirical basis of belief in creation. Astronomical observations have changed our worldview in an exemplary manner. I show by an example from imaginative literature that human beings can perceive stars by means other than astronomical observation. This alternative mode may be described as “participatory perception,” in which a human experiences the world not by objectifying separation as (...) in science, but by personal involvement. I relate such perceptions to “embodied cognitive science,” a topical interdisciplinary field of research in philosophy, psychology, and neuroscience. Embodied cognitions initiate processes that can convey personal experiences of the stars. Such cognitions may involve religious apprehensions and give rise to sophisticated values. It is argued that the knowledge available through astrophysics and interpretation of the universe as divine creation represent two different ways of perceiving the same reality and should thus be seen as mutually complementary. (shrink)

In the context of astrophysical modeling at the solar system scale, we investigate the modalities implied by taking into account different levels of detail at which phenomena can be considered. In particular, by framing the analysis in terms of the how-possibly/how-actually distinction, we address the debated question as to whether the degree of plausibility is tightly linked to the degree of detail. On the grounds of concrete examples, we argue that, also in the astrophysical context examined, this is not necessarily (...) the case. (shrink)

Astrophysics faces methodological challenges as a result of being a predominantly observation-based science without access to traditional experiments. In light of these challenges, astrophysicists frequently rely on computer simulations. Using collisional ring galaxies as a case study, I argue that computer simulations play three roles in reasoning in astrophysics: (1) hypothesis testing, (2) exploring possibility space, and (3) amplifying observations.

Astrophysics is a scientific field with a rich ontology of individual processes and general phenomena that occur in our universe. Despite its central role in our understanding of the physics of the universe, astrophysics has largely been ignored in the debate on scientific realism. As a notable exception, Hacking (Philos Sci 56(4):555–581, 1989) argues that the lack of experiments in astrophysics forces us to be anti-realist with respect to the entities which astrophysics claim inhabit the universe. (...) In this paper, I investigate the viability of astrophysical realism about black holes, given other formulations of entity realism, specifically Cartwright’s (How the Laws of Physics Lie. Oxford University Press, 1983), and Chakravartty’s (A Metaphysics for Scientific Realism: Knowing the Unobervable. Cambridge University Press, 2007) versions of entity realism. I argue that on these accounts of entity realism, you cannot be a realist with respect to black holes, and likewise, if you want to be a realist about black holes, you cannot be an entity realist of these particular strands. (shrink)

While written by a prominent and active scientist, this book is based on personal experience and biblical theology. It doesn't try to derive God s existence from science and it's critical of scientific inferences on the notion of God (Natural Theology). Cosmic fine-tuning and other coincidences are no proof of God, but are amazing, astounding and will never be fully explained. Amazement is the appropriate emotional perception of reality. The objective world is not a matter of course and may well (...) not exist at all; thus reality, at times, is experienced to be very special. Human life, the beauty of nature, the habitability of planet Earth can be considered undeserved gifts. In the light of these gifts, the universe is metaphorically interpreted and existentially believed as a divine Creation. Science cannot create such faith but can foster it. Is God necessary to explain the universe? Is the idea of a Creator excluded by modern science? Why continue speaking of a Creator and to believe (trust and hope) in His continuing creation when God cannot be demonstrated in scientific data? Arnold Benz, a renowned astrophysicist and Christian, insists that human perception reaches further than science and demonstrates this in various examples, personal, biblical, and literary.". (shrink)

With the ever-growing quality of observational data in astronomy, the complexity of astrophysical models has been increasing in turn. This trend raises the question: Are there still reasons to prefer simpler models if the final goal is an actual model-target comparison? I argue for two aspects in which astrophysical research may favor models having reduced complexity: first, to address the problem of determining the values of adjustable parameters and, second, to pave the way for a validation of the model based (...) on the modeler’s understanding of the scope of the model and the critical processes on the target’s side. (shrink)

This chapter examines some of the philosophical literature on idealizations in science and the epistemic challenges idealizations potentially pose for astrophysical methodology, particularly its use of computer simulations. We begin by surveying philosophical literature on idealization connected to (1) kinds of idealizations deployed in science, (2) the aims of idealization in science, and (3) various strategies for de-idealization. Using collisional ring galaxy simulations as a case study, we examine how these three themes play out in the context of astrophysical computer (...) simulations. Ultimately, we argue that deploying deidealization strategies is central to bolstering epistemic confidence in simulations in astrophysics. We conclude with some remarks on the role of idealization in the context of astrophysical computer simulations more generally. (shrink)

This article argues in favour of an inferential role for fictions in scientific modelling. The argument proceeds by means of a detailed case study, namely models of the internal structure of stars in stellar astrophysics. The main assumptions in such models are described, and it is argued that they are best understood as useful fictions. The role that conditionals play in these models is explained, and it is argued that fictional assumptions play an important role as either background or (...) antecedent conditions. I then expand on the argument for the compatibility of fictions and scientific realism. I argue that realism and antirealism plausibly offer correspondingly different accounts of the semantics of these fictional conditionals. (shrink)

This dissertation examines the dynamical dark matter problem in twentieth century astrophysics from the point of view of History and Philosophy of Science. The dynamical dark matter problem describes the situation astronomers find themselves in with regard to the dynamics of large scale astrophysical systems such as galaxies and galaxy clusters: The observed motions are incompatible with the visible distribution matter given the accepted law of gravitation. This discrepancy has two classes of possible solutions: either there exists copious amounts (...) of some kind of matter that neither emits nor absorbs radiation , or the law of gravitation must be revised. ;Chapter 2 describes the physical and philosophical foundations of dynamical inferences---inferences from discrepancies between well-founded theoretical expectations and reliable observations to the characteristics of candidate solutions. Chapter 3 discusses the history of dark matter . Chapter 4 reviews the present evidence bearing on the dark matter problem. Chapter 5 evaluates the important candidate matter solutions in light of the available evidence. Chapter 6 evaluates two candidate gravitational solutions on evidential and methodological grounds, and addresses the problem of theory choice. I do not try to solve the dark matter problem, but to uncover and evaluate patterns of inference involved in evidential arguments for and against candidate solutions. ;I show that Newton's "Reasoning from Phenomena" is a good framework from which to understand what is going on in this field. I argue that "higher order" and especially non-dynamical evidence is the best hope for solving this problem in dynamics. This is so in part because of "the dark matter double bind": the very existence of the dark matter problem means that we cannot be sure of the overall matter distribution in astrophysical systems, and this in turn means that the observed motions by themselves cannot provide relative confirmation of any theory of gravitational interactions taking place at these scales. I use Newton's Rules of Reasoning to argue that we should retain General Relativity as our theory of gravity at galactic and greater scales, despite the lack of positive evidence to confirm it over its rivals at these scales. (shrink)

This article discusses Xenophanes' “cloud astro-physics”. It analyses and explains all heavenly and meteorological phenomena in terms of clouds. It provides a view of this newer Xenophanes, who is now being recognized as an important philosopher-scientist in his own right and a crucial figure in the development of critical thought about human knowledge and its objects in the next generation of Presocratic thinkers. Xenophanes' account has been preserved in Aëtius, the doxographic compendium reconstructed by Hermann Diels late in the nineteenth (...) century mainly from two sources that show extensive parallelism: pseudo-Plutarch Placita Philosophorum or Epitome of Physical Opinions ; and Ioannes Stobaeus' Eclogae Physicae or Physical Extracts. In the Stobaeus version, which is also the one printed in the standard edition of the Pre-socratics. (shrink)

Recent developments in astrophysical cosmology have revived support for the design argument among a growing clique of astrophysicists. I show that the scientific/mathematical evidence cited in support of intelligent design of the universe is infected with a mathematical sharp practice: the concepts of two numbers being of the same order of magnitude, and of being within an order of each other, have been stretched from their proper meanings so as to doctor the numbers evidentially. This practice started with A. S. (...) Eddington and P. A. M. Dirac in the 1920s and 1930s, but it is still very much alive today. 1 Introduction 2 The birth of a sharp practice 3 High tide for the anthropic principle 4 How not to do things with numbers 5 The recalcitrant sloppiness of crud 6 How excited can excited carbon-12 be? 7 Is a pile of doubts a doubtful pile? 8 Conclusion. (shrink)

The dark matter problem in astrophysics exposes an underappreciated weakness in the evidential warrant for General Relativity (GR). The "dark matter double bind" entails that GR gets no differential evidential support from dynamical phenomena occurring at scales larger than our solar system, as compared to members of a significant class of rival gravitation theories. These rivals are each empirically indistinguishable from GR for phenomena taking place at solar system scales, but make predictions that may differ radically from GR's at (...) larger scales. Thus the typical confidence in the universal applicability of GR is insufficiently warranted in the present evidential context. (shrink)

All quantum-physical and cosmological causal/non-causal dilemmas have superluminally causal solutions if existents are processual by extension-change impact-transfer. Fixing the extent of applicability of mathematics to physics demonstrates Universal Causality for cosmogenetic theories. Whether the cosmos is of finite or infinite content, the Gravitational Coalescence Paradox in cosmogenetic theories yields a philosophical cosmology of infinite-eternal continuous creation: specifically, the Gravitational Coalescence Cosmology.

This paper compares four techniques for measuring the masses of galaxies and larger astrophysical systems from their dynamics. The apparent agreement of these techniques is sometimes invoked as reason for hypothesizing the existence of huge quantities of “dark matter” as the best solution to “the dynamical discrepancy”, the 100-fold disparity between the amount of mass visible in large scale astrophysical systems and the amount calculated from dynamics. This paper argues that the agreement, though suggestive, is not definitive. The coincident measurements (...) remain the best reason for preferring dark matter over revisions to General Relativity for solving the dynamical discrepancy, but the resulting warrant for this preference is weak. (shrink)

At the commencement of the universe and in the deep past of the observable realm, the first three minutes is a topic both scientifically challenging and philosophically intriguing. While the universe is believed to have undergone drastic changes over this short period, scientists seem to have essential difficulties with gaining observational evidence and conceiving physics in high-energy conditions. This essay delves into philosophical issues concerning evidence, inference, methodology, and the standard for legitimate scientific knowledge about the early universe. Focusing on (...) three central scientific topics, the Big Bang nucleosynthesis, cosmic inflation, and multiverse, I analyze how scientists employ various forms of evidence, methods, and inferences to achieve remarkable success in obtaining detailed knowledge. It also turns out that those topics face different epistemic challenges and deserve different degrees of credibility. A feature of the early universe is the philosophical root of debates in science. I exemplify this by showing that debates about inflation and the multiverse stem from philosophical disagreements about standards for scientific explanation and the significance of hypothesis testing. I conclude by situating the philosophy of the early universe in the context of big history and pinpointing how it shapes our picture of “the beginning of everything”. (shrink)

We discuss three philosophically interesting epistemic peculiarities of black hole astrophysics: (1) issues concerning whether and in what sense black holes do exist; (2) how to best approach multiplicity of available definitions of black holes; (3) short (i.e., accessible within an individual human lifespan) dynamical timescales present in many of the recent, as well as prospective, observations involving black holes. In each case we argue that the prospects for our epistemic situation are optimistic.

The LIGO-Virgo Collaboration achieved the first ‘direct detection’ of gravitational waves in 2015, opening a new “window” for observing the universe. Since this first detection (‘GW150914’), dozens of detections have followed, mostly produced by binary black hole mergers. However, the theory-ladenness of the LIGO-Virgo methods for observing these events leads to a potentially-vicious circularity, where general relativistic assumptions may serve to mask phenomena that are inconsistent with general relativity (GR). Under such circumstances, the fact that GR can ‘save the phenomena’ (...) may be an artifact of theory-laden methodology.This paper examines several ways that the LIGO-Virgo observations are used in theory and hypothesis testing, despite this circularity problem. First, despite the threat of vicious circularity, these experiments succeed in testing GR. Indeed, early tests of GR using GW150914 are best understood as a response to the threat of theory-ladenness and circularity. Each test searches for evidence that LIGO-Virgo’s theory-laden methods are biasing their overall conclusions. The failure to find evidence of this places constraints on deviations from the predictions of GR. Second, these observations provide a basis for studying astrophysical and cosmological processes, especially through analyses of populations of events. As gravitational-wave astrophysics transitions into mature science, constraints from early tests of GR provide a scaffolding for these population-based studies. I further characterize this transition in terms of its increasing connectedness to other parts of astrophysics and the prominence of reasoning about selection effects and other systematics in drawing inferences from observations.Overall, this paper analyses the ways that theory and hypothesis testing operate in gravitational-wave astrophysics as it gains maturity. In particular, I show how these tests build on one another in order to mitigate a circularity problem at the heart of the observations. (shrink)

Work on the methodology of natural science involves serious difficulties over and above those encountered in any other aspect of natural science or of philosophy. Reference is to the obvious fact that in discussing methodological questions of, for example, physics, so as to be precise, it is not enough to know physics: it is also necessary to familiarize oneself with certain branches of philosophy, the history of science, and so forth. Furthermore, a professional cannot limit himself to "general familiarity" with (...) the material. He has to know the details and, if possible, the entire literature on the question under discussion. However, the volume of literature on physics has, within the memory of the author alone — that is, over approximately forty years — multiplied dozens of times. I cannot say how great has been the increase in the quantity of information on the methodology of natural science and related disciplines. But what is important is that the amount of material that has accumulated to date is enormous. Some notion of the scale of the work may be gained from the abstract journal Obshchestvennye nauki za rubezhom. Seriia 8. Naukovedenie. For example, no. 1 for 1980 contained abstracts of 72 articles and books; this amounts to over 400 titles a year . When we add to this the Soviet literature and the need to include material from many years, we arrive at a figure of four digits. Naturally, only a very small portion of the literature is made use of in any particular piece of work, but it is impossible to know beforehand which items will be specifically needed. (shrink)

The purpose of this paper is twofold. First, we will observe how May’s background in astrophysics influenced Queen's lyrics, such as 'Don't Stop Me Now' or 'Dead on Time'. Our goal is to see how physical and philosophical concepts of matter and time intersect with the common understanding of such phenomena, and how they differ from them. Second, we will focus on usually not that well-known song ‘39, which shows the entire point of the special theory of relativity through (...) a prism of storytelling. Concepts of space and time will be analyzed from both absolute and relative perspectives, connecting them to historical theories of space and time. (shrink)

The article presents philosophical views on music in the context of the transformations of the worldview from Antiquity to the Modern Time. In this research author also mentions the contemporary issues, and uses her own philosophical concept of the music, which can be described as following: the value of music as a substance and the way of the valuable interaction of a person with the world affirm the essence of musical being, in which the invariable principle of Harmony, the principle (...) of Chaos-Form movement, is preserved. Music expresses the fluid essence of the world and changes of being in space and time. Philosophy of music as a field of philosophical knowledge considers music from ontological-epistemological and phenomenological-axiological prospectives, as something more than just a form of art. It explores the deep, ultimate foundations of the existence of music as such and the philosophical and aesthetic foundations of musical art. Since ancient times music has been a representation of the world in the human conscience and served as the harmonic equivalent of cosmological philosophy, mathematics, astronomy, and astrophysics. The scientific view on music was enriched in the Modern Time by the expanded view on the cosmo-sound space reflected in musical art, which at the same time transforms the mathematical ideas of geometricity, squareness etc. The tendency to create integral world music in the musical practice of the XX-XXI centuries explains the attempt of mankind to present music by modern methods of composing musical art as an expression of fear towards the secret Harmony of universal existence, and, on the other hand - as a form of search for salvation and mental balance, intuitively reflecting what is happening in natural science, which more and more points to the abyss of unknowable universe, and the unstable place of man in the world. (shrink)

In recent years, Nietzsche’s views on (natural) science attracted a considerable amount of scholarly attention. Overall, his attitude towards science tends to be one of suspicion, or ambivalence at least. My article addresses the “Nietzsche and science” theme from a slightly different perspective, raising a somewhat different type of question, more pragmatic if you like, namely: how to be a Nietzschean philosopher of science today? What would the methodological contours of a Nietzschean approach to present-day research areas (such as neuroscience, (...) astrophysics, synthetic biology or climate studies) amount to? In other words, my paper reflects a shift of focus from author studies to extrapolation. The design of my article is as follows. I will start with the question (already widely discussed in the expert literature) to what extent Friedrich Nietzsche (a classical philologist by training) managed to familiarise himself with the natural sciences of his epoch. Subsequently, I will outline some basic methodological and conceptual ingredients of Nietzsche’s philosophy of science, focussing on core issues such as “genealogy”, “interpretation”, “enhancement” and “truth”. Next, I will elucidate Nietzsche’s genealogical methodology with the help of three case studies (three representative samples if you will) taken from Nietzsche’s writings and dealing with physiology, astronomy and neuro-psychology respectively. Finally, I will present the methodological contours of a Nietzschean understanding of contemporary technoscience. (shrink)

This handbook provides both an overview of state-of-the-art scholarship in philosophy of science, as well as a guide to new directions in the discipline. Section I contains broad overviews of the main lines of research and the state of established knowledge in six principal areas of the discipline, including computational, physical, biological, psychological and social sciences, as well as general philosophy of science. Section II covers what are considered to be the traditional topics in the philosophy of science, such as (...) causation, probability, models, ethics and values, and explanation. Section III identifies new areas of investigation that show promise of becoming important areas of research, including the philosophy of astronomy and astrophysics, data, complexity theory, neuroscience, simulations, post-Kuhnian philosophy, post-empiricist epistemology, and emergence. Most chapters are accessible to scientifically educated non-philosophers as well as to professional philosophers, and the contributors - all leading researchers in their field -- bring diverse perspectives from the North American, European, and Australasian research communities. This volume is an essential resource for scholars and students. (shrink)

Analytical reflections on tasks and functions of philosophy in the modern world, as well as, efforts deriving novel vision of practically all areas of the philosophical thought may become sound only after consideration of the innovations with which modern natural science has crossed the 20—21 centuries boundary. Discoveries in astrophysics at the end of the 20th century offer new and unprecedented perceptions of our world. In this world only 4% of the total Universe energy is attributed to the known (...) forms of the matter, 20% constitutes “dark matter” and 76% is in “dark energy”. The first decade of the 21st century will go on record inhistory of the civilization as the one associated with breakthrough experiments shedding light on the nature of the mysterious types of the matter, and construction of the unified theory of field. It is safe to regard modern science to be on the verge of profound transformations. These changes are bound to alter our outside world comprehension, redefining human being’s place in it. That advances a set of new serious requirements to philosophy as a science that must present ability to adapt to provide adequate and meaningful methodological interpretations to anticipated discoveries. This article addresses the characteristic features of modern conceptual knowledge of the world, with an attempt of offering their philosophical and methodological comprehension. (shrink)

Written by an experienced author with a strong background in both History and Earth Sciences, this text explores the philosophic implications of the dramatic ...

In Seeing Things, Robert Hudson assesses a common way of arguing about observation reports called "robustness reasoning." Robustness reasoning claims that an observation report is more likely to be true if the report is produced by multiple, independent sources. Seeing Things argues that robustness reasoning lacks the special value it is often claimed to have. Hudson exposes key flaws in various popular philosophical defenses of robustness reasoning. This philosophical critique of robustness is extended by recounting five episodes in the history (...) of science (from experimental microbiology, atomic theory, astrophysics, and astronomy) where robustness reasoning is — or could be claimed to have been — used. Hudson goes on to show that none of these episodes do in fact exhibit robustness reasoning. In this way, the significance of robustness reasoning is rebutted on both philosophical and historical grounds. But the book does more than critique robustness reasoning. It also develops a better defense of the informative value of observation reports. The book concludes by relating insights into the failure of robustness reasoning to a popular approach to scientific realism called "(theoretical) preservationism." Hudson argues that those who defend this approach to realism commit similar errors to those who advocate robustness reasoning. In turn, a new form of realism is formulated and defended. Called "methodological preservationism," it recognizes the fundamental value of naked-eye observation to scientists — and the rest of us. (shrink)

This white paper outlines the plans of the History Philosophy Culture Working Group of the Next Generation Event Horizon Telescope Collaboration.

This book approaches post-truth and relativism in a multidisciplinary fashion. Researchers from astrophysics, philosophy, psychology, media studies, religious studies, anthropology, social epistemology and sociology discuss and analyse the impact of relativism and post-truth both within the academy and in society at large. The motivation for this multidisciplinary approach is that relativism and post-truth are multifaceted phenomena with complex histories that have played out differently in different areas of society and different academic disciplines. There is hence a multitude of ways (...) in which to use and understand the concepts and the phenomena to which they refer, and a multitude of critiques and defenses as well. No single volume can capture the ongoing discussions in different areas in all their complexity, but the different chapters of the book can function as exemplifications of the ramifications these phenomena have had. (shrink)

The purpose of the article is to analyze the meaning of examples in C. Hempel’s works. Hempel uses many examples referring to readings of magnetic hand, burning of white phosphorus, predictions of properties of some elements of the table of Mendeleev, to astrophysical hypotheses, terms of total solar eclipse, throwing of dice, as well as on unmarried men, on white and black swans, green mermaids, black crows and white shoes, blue roses, predictions of Jones’ recovery, the eruption of Vesuvius, the (...) assassination of Julius Caesar, and other “special cases” and “concrete facts”. The question is raised as to whether the case studies are mere illustrative material, a form of argumentation; a way of verifying Hempel’s ideas, their “demonstrable confirmation”, and in this sense a definite empirical basis for the study. The necessity of analyzing concrete examples in the context of Hempel’s theoretical research is shown, for which the examples turn out to be an occasion for investigating the logic of confirmation and the logic of explanation, for analyzing the structures of explanans and explanandum, for understanding the differences in inductive and deductive logical constructions, and for analyzing “quasi-induction”. The paper discusses Hempel’s famous example, the crow paradox, which is named in his honor and is a kind of logical provocation. (shrink)

This Review of “Suggested Answers to Philosophical Puzzles” by Prof. Anguel S. Stefanov (Cambridge Scholars Publishing, 2022) concentrates on the astrophysical chapters of the book. Spreading from what is a proper definition of a non-classical scientific theory, to the very nature of spacetime, the puzzle of the origin of the Universe and the appearance of humankind, this fascinating book brings a fresh, deep, and inspirational approach to some of the oldest, yet not resolved puzzles in modern astrophysics.

Galilée, Descartes et Newton avaient brillamment inauguré une ère scientifique qui s'achève, celle de la science analytique, déterministe et mécaniste. Les sciences de la complexité ouvrent de nouveaux continents à explorer. Sur d'autres principes, sur d'autres dimensions, sur d'autres prémices. De fondements, l'espace, le temps, la force, le mouvement, la matière deviennent des conséquences, des produits, des faits seconds. Tout est processus, et cela rejoint les vieilles intuitions, grecque de Logos, chinoise de Tao ou indienne de Brahman. Sciences, philosophies, spiritualités (...) et mystiques convergent enfin! (shrink)

Scientific philosophy is that which is informed by science. It uses exact tools such as logic and mathematics and provides a framework for scientific activity to solve more general questions about nature, the language we use to describe it, and the knowledge we obtain thanks to it. Many of the scientific philosophy theories can be proven and evaluated using scientific evidence. In this paper, I focus on showing how several classical philosophy topics, such as the nature of space and time (...) or the dimensionality of the future, can be addressed philosophically using the tools from current astrophysics research and, in particular, from the study of black holes and gravitational waves. (shrink)

Meta-philosophy. Philosophy of philosophizing. Philosophy. Art. Religion, science, ethics, death, astrophysics, the universe, philosophizing as theorizing and many other disciplines. 176,400 views of my profile in the top 0.1%.

Ciel noir, corps noir, trou noir, matière noire et énergie noire : pourquoi les physiciens éprouvent-ils le besoin de noircir certaines de leurs idées? Loin d'être anecdotique, cette interrogation permet de traverser l'histoire de la physique et d'en soulever une bonne part des enjeux actuels. L'énigme du ciel noir a préoccupé les astronomes pendant des siècles ; l'étude du rayonnement du corps noir est à l'origine de la révolution quantique ; le trou noir est une singularité cosmique fascinante ; la (...) matière noire et l'énergie noire sont des hypothèses mystérieuses de la cosmologie contemporaine. A partir de leurs disciplines respectives, l'astrophysicien Roland Lehoucq et le philosophe des sciences Vincent Bontems éclairent tour à tour la signification du qualificatif "noir" pour chacune de ces idées. Il ne s'agit donc pas d'un livre de vulgarisation classique, mais d'un dialogue où se répondent la signification scientifique de la couleur noire et la rêverie sur les métaphores ténébreuses. Dans le sillage de Gaston Bachelard, qui fut le premier à pratiquer ainsi en parallèle l'épistémologie et la psychanalyse de l'imaginaire, ces deux chercheurs proposent de manière complice une excursion dans les méandres de la recherche en alternant les éclairages critiques et émerveillés pour en dissiper l'obscurité. Les idées noires de la physique s'y révèlent instructives et inspirantes. (shrink)

In the late 1990s, computational technology had advanced sufficiently that astrophysicists were able to construct reasonably high resolution computer simulations of the Local Group of galaxies. These simulations indicated there should be around 250 small satellite galaxies orbiting the Milky Way and Andromeda. In the real Local Group, however, only around 40 satellites had been observed, and only twenty or so more have been discovered since then. Despite this discrepancy in numbers, claims have been made in recent years that the (...) ‘missing satellites problem’ has been solved. Using the examples of the constructed luminosity curve, and hydrodynamic simulations, this paper explores how simulations are used in conjunction with observation to ‘solve’ the missing satellites problem. It is suggested that the simulated universes have sufficient complexity to be understood as worlds in their own right, ones that can be measured and observed. By demonstrating that these virtual worlds are sufficiently ‘realistic’ with respect to observations, astrophysicists are able to make a robust argument for the existence of ‘dark’, non-observable astrophysical objects. Observational and simulated data are combined to demonstrate the plausibility—a term that develops more ontologically meaningful connotations—of both the existence and the maintenance of dark satellites. It is thus through the conflation of the real and virtual worlds, the blending of simulation data with empirical data, that the missing satellites problem is ‘solved’. (shrink)

This Element offers an overview of some of the most important debates in philosophy and physics around the topics of emergence and reduction and proposes a compatibilist view of emergence and reduction. In particular, it suggests that specific notions of emergence, which the author calls 'few-many emergence' and 'coarse-grained emergence', are compatible with 'intertheoretic reduction'. Some further issues that will be addressed concern the comparison between parts-whole emergence and few-many emergence, the emergence of effective theories, the use of infinite limits, (...) the notion of intertheoretic reduction and the explanation of universal and cooperative behavior. Although the focus will be principally on classical phase transitions and other examples from condensed matter physics, the main aim is to draw some general conclusions on the topics of emergence and reduction that can help us understand a variety of case-studies ranging from high-energy physics to astrophysics. (shrink)

In 1908, three years after Einstein first published his special theory of relativity, the mathematician Hermann Minkowski introduced his four-dimensional “spacetime” interpretation of the theory. Einstein initially dismissed Minkowski’s theory, remarking that “since the mathematicians have invaded the theory of relativity I do not understand it myself anymore.” Yet Minkowski’s theory soon found wide acceptance among physicists, including eventually Einstein himself, whose conversion to Minkowski’s way of thinking was engendered by the realization that he could profitably employ it for the (...) formulation of his new theory of gravity. The validity of Minkowski’s mathematical “merging” of space and time has rarely been questioned by either physicists or philosophers since Einstein incorporated it into his theory of gravity. Physicists often employ Minkowski spacetime with little regard to the whether it provides a true account of the physical world as opposed to a useful mathematical tool in the theory of relativity. Philosophers sometimes treat the philosophy of space and time as if it were a mere appendix to Minkowski’s theory. In this critical study, Joseph Cosgrove subjects the concept of spacetime to a comprehensive examination and concludes that Einstein’s initial assessment of Minkowksi was essentially correct. (shrink)

The emergence of the hominids, more than five million years ago, marked the start of the human odyssey through space and time. This book deals with the last stage of this fascinating journey: the exploration of cyberspace and cybertime. Through the rapid global implementation of information and communication technologies, a new realm for human experience and imagination has been disclosed. Reversely, these postgeographical and posthistorical technologies have started to colonize our bodies and minds. Taking Homer's Odyssey and Kubrick's 2001: A (...) Space Odyssey as his starting point, the author investigates the 'informatization of the worldview', focusing on its implications for our culture-arts, religion, and science-and, ultimately, our form of life. Moving across a wide range of disciplines, varying from philosophical anthropology and palaeontology to information theory, and from astrophysics to literary, film and new media studies, the author discusses our 'cyberspace odyssey' from a reflective position beyond euphoria and nostalgia. His analysis is as profound as nuanced and deals with issues that will be high on the agenda for many decades to come. In 2003 a Dutch Edition of Cyberspace Odyssey received the Socrates Prize for the best philosophy book published in Dutch. (shrink)

Dr. Stephen Hawking was the most renowned scientist since Einstein, known both for his groundbreaking work in physics and cosmology and for his mischievous sense of humor. He educated millions of readers about the origins of the universe and the nature of black holes, and inspired millions more by defying a terrifying early prognosis of ALS, which originally gave him only two years to live. In later life he could communicate only by using a few facial muscles, but he continued (...) to advance his field and serve as a revered voice on social and humanitarian issues. Hawking not only unraveled some of the universe's greatest mysteries but also believed science plays a critical role in fixing problems here on Earth. Now he turns his attention to the most urgent issues facing us. Will humanity survive? Should we colonize space? Does God exist? These are just a few of the questions Hawking addresses in this wide-ranging, passionately argued final book from one of the greatest minds in history. Featuring a foreword by Eddie Redmayne, who won an Oscar playing Stephen Hawking, an introduction by Nobel Laureate Kip Thorne, and an afterword from Hawking's daughter, Lucy. (shrink)