5 citations · 10 across the 9 of their papers we have counts for
11 papers
-smooth approximation of mod integral cycles
Gianmarco Caldini, Anna Skorobogatova
We prove that every mod integral cycle of sufficiently high codimension in an oriented Riemannian manifold can be approximated in flat norm by a cycle which i…
Quasinormal modes of Kerr-Newman-de Sitter black holes from Heun connection formulae
Hideo Furugori, Naotaka Kubo, Hayato Motohashi +1
We study quasinormal modes governed by the Teukolsky equation in Kerr-Newman-de Sitter spacetime, formally treating the spin weight and field charge as arbitrary parameters. We use…
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…
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…
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.…
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…
Loosely trapped surface for slowly rotating black hole
Keisuke Izumi, Tetsuya Shiromizu, Daisuke Yoshida +2
We construct the marginal loosely trapped surface (marginal LTS) for the Kerr spacetime with a small Kerr parameter perturbatively, where the LTS condition is saturated. An LTS is…
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…
Gedanken Experiments to Destroy a Black Hole by a Test Particle: Multiply Charged Black Hole with Higher Derivative Corrections
Keisuke Izumi, Toshifumi Noumi, Daisuke Yoshida
We investigate a gedanken experiment to destroy an extremally charged black hole by dropping a test particle, provided that there are multiple gauge fields coupled with each…