3 papers
gr-qc2025
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…
hep-th2025
Perturbative unitarity bounds on field-space curvature in de Sitter spacetime: purity vs scattering amplitude
Qianhang Cai, Tomoya Inada, Masataka Ishikawa +2
We study perturbative unitarity bounds on the field-space curvature in de Sitter spacetime, using the momentum-space entanglement approach recently proposed by Duaso Pueyo, Goodhew…
hep-th2024
Gravitational EFT for dissipative open systems
Pak Hang Chris Lau, Kanji Nishii, Toshifumi Noumi
We elaborate on the effective field theory (EFT) construction for dissipative open systems coupled to dynamical gravity, in light of recent developments on the EFT of dissipative h…