109 citations · 613 across the 27 of their papers we have counts for
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gr-qc2021★ 59 cited
Quasinormal modes of charged black holes with corrections from nonlinear electrodynamics
Kimihiro Nomura, Daisuke Yoshida
We study quasinormal modes related to gravitational and electromagnetic perturbations of spherically symmetric charged black holes in nonlinear electrodynamics. Beyond the linear M…
hep-th2021★ 5 cited
String Excitation by Initial Singularity of Inflation
Kanji Nishii, Daisuke Yoshida
We discuss excitation of string oscillation modes by an initial singularity of inflation. The initial singularity of inflation is known to occur with a finite Hubble parameter, whi…
gr-qc2021★ 13 cited
Past extendibility and initial singularity in Friedmann-Lemaître-Robertson-Walker and Bianchi I spacetimes
Kimihiro Nomura, Daisuke Yoshida
We study past-directed extendibility of Friedmann-Lemaître-Robertson-Walker (FLRW) and Bianchi type I spacetimes with a scale factor vanishing in the past. We give criteria for det…