4 papers
Purely Electric, Magnetic, and Dyonic Black Holes in Einstein-Euler-Heisenberg Theory
Haoyuan Luo, Nan Cao, Xiao Yan Chew +3
We investigate static, spherically symmetric charged black holes in Einstein gravity coupled to Euler--Heisenberg (EH) nonlinear electrodynamics, including purely electric, purely…
Evolution of Linear Perturbations under Time-Dependent Hubble Friction I: SR-USR-SR Inflation
Wen Li, Chao Chen
The origin of the finite dip in the curvature power spectrum of instantaneous Slow-Roll (SR)-Ulta-Slow-Roll (USR)-SR inflation remains controversial at linear order, and its full s…
Constraining matter-bounce scenario from scalar-induced vector perturbations
Mian Zhu, Chao Chen
Bouncing cosmologies, while offering a compelling alternative to inflationary models, face challenges from the growth of vector perturbations during the contracting phase. While li…
Oscillations of the black hole photon ring as a probe of ultralight dilaton fields
Chunlong Li, Chao Chen, Xiao Yan Chew
Advancements of very long baseline interferometry (VLBI) have facilitated unprecedented probing of superradiant phenomena in the vicinities of supermassive black holes (SMBHs), est…