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gr-qc2025
Ringdown in Vaidya spacetimes: time-dependent frequencies, Penrose limit and time-domain analyses
Chul-Moon Yoo, Masashi Kimura, Akihiro Ishibashi +1
We examine the possible characterization of ringdown waves in a dynamical Vaidya spacetime using the Penrose limit geometry around the dynamical photon sphere. In the case of a sta…
gr-qc2025
Bianchi-I cosmology with scale dependent and in asymptotically safe gravity
Chiang-Mei Chen, Akihiro Ishibashi, Rituparna Mandal +1
We study anisotropic Bianchi-I cosmology, incorporating quantum gravitational corrections into the Einstein equation through the scale-dependent Newton coupling and cosmological te…