Yusmantoro | Searcharxiv

arXiv2025

Scalar tidal response of static and rotating black holes in anti-de Sitter spacetime

In this work, we investigate the tidal response of both static and rotating black holes in anti de-Sitter spacetime. We perform the neutral scalar field perturbation for Schwarzschild and Kerr black holes. On the other hand, charged scalar field are used for perturbing Reissner-Nordstrom and Kerr-Newman black holes. We find that the tidal Love number for all black holes are always nonvanishing due to the presence of cosmological constant. In contrast, tidal dissipation can vanish for certain conditions depending on the scalar field's frequency and the black hole's parameters.

gr-qc↗

arXiv2022

Traversable and stable wormhole solutions in logarithmic f(R) gravity

This study aims to investigate the viability of a viable logarithmic f(R) gravity for inflation in giving wormhole solutions. We consider a static and spherically symmetric spacetime and two different shape functions. We found that the model provides traversable wormhole solutions shown by its violation to energy conditions. Violation to null energy condition indicates the existence of traversable wormhole and the existence of exotic matter. The equation of state parameter is less than -1 which shows the presence of phantom fluid. Furthermore, the stability of wormhole is analyzed using Tolman-Oppenheimer-Volkoff equation and we found that the wormhole solutions are stable. Finally, we conclude that the model is viable in giving wormhole solutions with the same parameter constraints as inflation.

gr-qc↗