125 citations · 1.5k across the 62 of their papers we have counts for
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Boundary Conditions for Constraint Systems in Variational Principle
Keisuke Izumi, Keigo Shimada, Kyosuke Tomonari +1
We show the well-posed variational principle in constraint systems. In a naive procedure of the variational principle with constraints, the proper number of boundary conditions doe…
High-energy properties of the graviton scattering in quadratic gravity
Yugo Abe, Takeo Inami, Keisuke Izumi
We obtain the matter-graviton scattering amplitude in the gravitational theory of quadratic curvature, which has term in the action. Unitarity bound is not satisfied bec…
Brane Dynamics of Holographic BCFTs
Keisuke Izumi, Tetsuya Shiromizu, Kenta Suzuki +2
In this paper we study various dynamical aspects of the AdS/BCFT correspondence in higher dimensions. We study properties of holographic stress energy tensor by analyzing the metri…
Invertibility conditions for field transformations with derivatives: toward extensions of disformal transformation with higher derivatives
Eugeny Babichev, Keisuke Izumi, Norihiro Tanahashi +1
We discuss a field transformation from fields to other fields that involves derivatives, , and derive conditions for th…
Divergence equations and uniqueness theorem of static spacetimes with conformal scalar hair
Takeshi Shinohara, Yoshimune Tomikawa, Keisuke Izumi +1
We reexamine the Israel-type proof of the uniqueness theorem of the static spacetime outside the photon surface in the Einstein-conformal scalar system. We derive in a systematic f…
Holographic entanglement entropy of deSitter braneworld with Lovelock
Kouki Kushihara, Keisuke Izumi, Tetsuya Shiromizu
We examine the deSitter entropy in the braneworld model with the Gauss-Bonnet/Lovelock terms. Then, we can see that the deSitter entropy computed through the Euclidean action exact…