arXiv subjects

Li-Shuai Wang

Publications and source records attributed to Li-Shuai Wang.

3 recordsLinked to original sources

arXiv2026

Evaporation and fate of covariant quantum black holes

A growing number of phenomena and theoretical problems indicate that quantum gravity theory is necessary. In this paper, we investigate the evaporation of covariant quantum BHs for particles with different spins and compare the results with the Schwarzschild case. Our results show that the Hawking radiation and mass loss rate of covariant quantum BHs differ from those of Schwarzschild BHs and they depend on the spins of the emitted particles. Therefore, these results suggest that it may be insufficient to consider only BH evaporation in the massless scalar field case and may provide a possible way to test loop quantum gravity in the future.

gr-qc↗

arXiv2026

Quantum Oppenheimer-Snyder primordial black holes as all the dark matter

Primordial black holes (PBHs) are widely considered as candidates for dark matter in many recent studies, and they are often modeled as Schwarzschild or Kerr black holes (BHs), which have curvature singularities. Nevertheless, resolving the classical singularity may require quantum gravity motivated corrections, thereby yielding an effective quantum corrected BH spacetime geometry different from the Schwarzschild or Kerr cases. Therefore, it is well motivated to consider BHs beyond the Schwarzschild or Kerr as viable PBH candidates. Based on these considerations, we investigate quantum Oppenheimer Snyder BHs as PBHs which could account for all the dark matter. Our results show that these BHs have temperatures and greybody factors markedly different from the Schwarzschild case, suppressing Hawking emission and thereby relaxing the $\gamma$-ray constraints from HEAO-1, COMPTEL, and EGRET, which, relative to the Schwarzschild case, broadens the allowed PBH mass window in the asteroid-mass range where PBHs can constitute all of the dark matter.

gr-qc↗

arXiv2025

Primordial black holes and scalar induced gravitational waves from sound speed resonance in non-minimal derivative coupling inflation model

We investigate an inflationary model with a non-minimal derivative coupling, where the coupling function contains both constant and periodic components. On large scales, the model is in excellent agreement with the latest Planck-ACT-LiteBIRD-BICEP/Keck 2018 (P-ACT-LB-BK18) observations. On small scales, the periodic component induces a sound-speed resonance mechanism that significantly amplifies curvature perturbations, resulting in the production of primordial black holes (PBHs). By incorporating nonlinear effects in the PBH abundance calculation, we find that the resulting PBHs can account for the majority of dark matter in the Universe. Furthermore, the PBH formation process generates scalar-induced gravitational waves (SIGWs) with a characteristic multi-peak spectral shape, which may be detectable by future space-based detectors such as LISA, Taiji, and TianQin. The model also predicts a high-frequency stochastic gravitational-wave background (SGWB) from PBH binary mergers. A combined detection of SIGWs and high-frequency gravitational waves (GWs) in future experiments would provide a direct and testable probe of this inflationary scenario.

astro-ph.CO↗