6 papers
Trapped Surface as a Cosmic Censor
Hideo Furugori, Daisuke Yoshida, Kaho Yoshimura
We formulate a local geometric criterion for weak cosmic censorship in black hole overcharging and overspinning thought experiments. Under the null convergence and generic conditio…
Apparent Horizons Associated with Dynamical Black Hole Entropy
Hideo Furugori, Kanji Nishii, Daisuke Yoshida +1
We define entropic marginally outer trapped surfaces (E-MOTSs) as a generalization of apparent horizons. We then show that, under first-order perturbations around a stationary blac…
Consistency between Bulk and Boundary Causalities in Asymptotically Anti-de Sitter Spacetimes
Lei Fu, Keisuke Izumi, Daisuke Yoshida
We investigate the consistency between bulk and boundary causalities in static, spherically symmetric, asymptotically anti-de Sitter (AdS) spacetimes. We derive a general formula t…
The First Law and Weak Cosmic Censorship for de Sitter Black Holes
Daisuke Yoshida, Kaho Yoshimura
We apply Iyer-Wald's covariant phase space formalism to asymptotically de Sitter spacetimes and establish the thermodynamic first law, expressed in terms of the Abbott-Deser mass.…
Multi-Sheet Wormholes in the Gravitational Soliton Formalism
Yusuke Makita, Keisuke Izumi, Daisuke Yoshida +1
We analytically construct static regular solutions describing wormholes that connect multiple asymptotic regions, supported by a phantom scalar field. The solutions are static and…
Removing naked singularities in static axially symmetric spacetimes by patching with the flat spacetimes
Daiki Saito, Daisuke Yoshida
We investigate static, axially symmetric spacetimes without naked singularities that are constructed by patching Weyl class spacetimes with the flat spacetimes. Once the exterior g…