3 papers
gr-qc2025
Wormholes as perturbations of near-horizon black hole geometries: no-go theorems within effective field theories
Takamasa Kanai, Kengo Maeda, Daisuke Yoshida
We reformulate the construction of wormhole solutions as perturbations around near-horizon geometries of near-extremal Reissner-Nordström black holes in four dimensions and equal-a…
hep-th2024
Cutoff Scale of Quadratic Gravity from Quantum Focusing Conjecture
Takamasa Kanai, Kengo Maeda, Toshifumi Noumi +1
We derive the cutoff length scale of the quadratic gravity in dimensional spacetime by demanding that the quantum focusing conjecture for the smeared quantum expansion h…
gr-qc2023
Entropy Bound and a Geometrically Nonsingular Universe
Takamasa Kanai, Kimihiro Nomura, Daisuke Yoshida
Bousso's entropy bound is a conjecture that the entropy through a null hypersurface emanating from a two-dimensional surface with a nonpositive expansion is bounded by the area of…