We consider a model of the state evolution of relativistic vector bosons, which includes both the dynamical equations for the particle four-velocity and the equations for the polarization four-vector evolution in the field of a nonlinear plane gravitational wave. In addition to the gravitational minimal coupling, tidal forces linear in curvature tensor are suggested to drive the particle state evolution. The exact solutions of the evolutionary equations are obtained. Birefringence and tidal deviations from the geodesic motion are discussed.

This paper explores the metaphysical concepts of divine “love” (ʿeshq), “attraction” (jadhbe), and “selflessness” (bīkhodī) in the seminal Iranian Shīʿī Muslim thinker Mullā Muḥsin Fayḍ Kāshānī’s poetry. This research emerges from the gap in existing literature, which mainly explores Fayḍ Kāshānī’s philosophical, theological, or ḥadīth works, while the scrutiny of his poetry largely stays within its literary attributes, overlooking the philosophical and mystical themes embedded within. The paper’s thesis posits that according to Fayḍ Kāshānī, the spiritual journey commences with reason, (...) progressing to constant divine contemplation, a combination that nurtures muḥabbat—an initial stage of divine love—which, when discovered, evokes a more intense love: “divine attraction” in the seeker’s heart, leading to selflessness and divine unity. This paper employs the hermeneutic method and analytical examination to scrutinize Fayḍ Kāshānī’s poetry within the context of his treatises. It follows an “intracultural” interpretation to explore Fayḍ Kāshānī’s thought within Persian intellectual tradition and uses an “intercultural” interpretation to contextualize the findings within Islamic, Christian, and ancient Greek metaphysics. The methodology includes a “horizontal interpretation” of Quranic and ḥadīth references in Fayḍ Kāshānī’s works and a “vertical interpretation” of unveiling deeper meanings of Fayḍ Kāshānī’s thoughts within the broader mystical traditions. (shrink)