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12 papers · 2 filters
Periodic Gravitational Lensing with Oscillating Boson Stars
Xing-Yu Yang, Tan Chen, Rong-Gen Cai
We show that oscillating (real-scalar) boson stars generically host an \emph{oscillating radial caustic}. Sources near this caustic cross it every half period, thereby producing pe…
Third law of repetitive electric Penrose processes
Li Hu, Rong-Gen Cai, Shao-Jiang Wang
Recently, Ruffini et al. [Phys. Rev. Lett. 134 (2025) 8, 081403] pointed out that the repetitive Penrose process cannot drain the entire extractable energy of a Kerr black hole. In…
Topological charge and black hole photon spheres in massive gravity
Pavan Kumar Yerra, Chandrasekhar Bhamidipati
In this paper, we investigate the existence and nature of the photon spheres (PS) in the background of four dimensional static and spherically symmetric black holes in the de Rham-…
A comprehensive dynamical and phenomenological analysis of structure growth in curvature-modulated coupled quintessence scenario
Anirban Chatterjee, Yungui Gong
We investigate an interacting dark energy-dark matter model within the quintessence framework, characterized by the coupling term , a…
Ring formation from black hole superradiance through repeated particle production on bound orbits
Zhen-Hong Lyu, Rong-Gen Cai, Zong-Kuan Guo +2
Ultralight bosonic fields around a rotating black hole can extract energy and angular momentum through the superradiant instability and form a dense cloud. We investigate the scena…
Effects of acceleration on interatomic interactions
Shijing Cheng, Wenting Zhou, Hongwei Yu
The Unruh effect establishes a fundamental equivalence between acceleration and thermality by demonstrating that a uniformly accelerated ground-state detector undergoes excitation…