159 citations · 1.6k across the 48 of their papers we have counts for
28 papers · 1 filter
Holographic Description of Bulk Wave Packets in AdS/CFT
Norihiro Tanahashi, Seiji Terashima, Shiki Yoshikawa
In this paper, we extend the study of wave packets from the AdS/CFT correspondence to AdS/CFT and examine properties of their energy density. We find that, while th…
Krylov complexity and chaos in quantum mechanics
Koji Hashimoto, Keiju Murata, Norihiro Tanahashi +1
Recently, Krylov complexity was proposed as a measure of complexity and chaoticity of quantum systems. We consider the stadium billiard as a typical example of the quantum mechanic…
Hairy black holes in AdS with Robin boundary conditions
Tomohiro Harada, Takaaki Ishii, Takuya Katagiri +1
We study hairy black holes in Einstein-Maxwell-complex scalar theory in four-dimensional asymptotically global anti-de Sitter (AdS) spacetime when the Robin boundary conditions are…
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…
A bound on energy dependence of chaos
Koji Hashimoto, Keiju Murata, Norihiro Tanahashi +1
We conjecture a chaos energy bound, an upper bound on the energy dependence of the Lyapunov exponent for any classical/quantum Hamiltonian mechanics and field theories. The conject…
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…
Invertible field transformations with derivatives: necessary and sufficient conditions
Eugeny Babichev, Keisuke Izumi, Norihiro Tanahashi +1
We formulate explicitly the necessary and sufficient conditions for the local invertibility of a field transformation involving derivative terms. Our approach is to apply the metho…
Dyonic Catalysis in the KPV Vacuum Decay
Yuichiro Nakai, Yutaka Ookouchi, Norihiro Tanahashi
We investigate catalysis induced by a dyonic impurity in the metastable vacuum studied by Kachru, Pearson and Verlinde, which can be relevant to vacuum decay in the KKLT scenario.…
Chaos of Wilson Loop from String Motion near Black Hole Horizon
Koji Hashimoto, Keiju Murata, Norihiro Tanahashi
To find the origin of chaos near black hole horizon in string-theoretic AdS/CFT correspondence, we perform a chaos analysis of a suspended string in AdS black hole backgrounds. It…
Wave propagation and shock formation in the most general scalar-tensor theories
Norihiro Tanahashi, Seiju Ohashi
This work studies wave propagation in the most general scalar-tensor theories, particularly focusing on the causal structure realized in these theories and also the shock formation…
Universality in Chaos of Particle Motion near Black Hole Horizon
Koji Hashimoto, Norihiro Tanahashi
Motion of a particle near a horizon of a spherically symmetric black hole is shown to possess a universal Lyapunov exponent of a chaos provided by its surface gravity. To probe the…
New Quasidilaton theory in Partially Constrained Vielbein Formalism
Antonio De Felice, A. Emir Gümrükçüoğlu, Lavinia Heisenberg +2
In this work we study the partially constrained vielbein formulation of the new quasidilaton theory of massive gravity which couples to both physical and fiducial metrics simultane…
Cosmology in bimetric theory with an effective composite coupling to matter
A. Emir Gumrukcuoglu, Lavinia Heisenberg, Shinji Mukohyama +1
We study the cosmology of bimetric theory with a composite matter coupling. We find two possible branches of background evolution. We investigate the question of stability of cosmo…
Shock Formation in Lovelock Theories
Harvey S. Reall, Norihiro Tanahashi, Benson Way
We argue that Lovelock theories of gravity suffer from shock formation, unlike General Relativity. We consider the propagation of (i) a discontinuity in curvature, and (ii) weak, h…
Causality and Hyperbolicity of Lovelock Theories
Harvey S. Reall, Norihiro Tanahashi, Benson Way
In Lovelock theories, gravity can travel faster or slower than light. The causal structure is determined by the characteristic hypersurfaces. We generalise a recent result of Izumi…
Viable cosmology in bimetric theory
Antonio De Felice, A. Emir Gumrukcuoglu, Shinji Mukohyama +2
We study cosmological perturbations in bimetric theory with two fluids each of which is coupled to one of the two metrics. Focusing on a healthy branch of background solutions, we…
Dynamical Meson Melting in Holography
Takaaki Ishii, Shunichiro Kinoshita, Keiju Murata +1
We discuss mesons in thermalizing gluon backgrounds in the N=2 supersymmetric QCD using the gravity dual. We numerically compute the dynamics of a probe D7-brane in the Vaidya-AdS…
Cosmological matching conditions and galilean genesis in Horndeski's theory
Sakine Nishi, Tsutomu Kobayashi, Norihiro Tanahashi +1
We derive the cosmological matching conditions for the homogeneous and isotropic background and for linear perturbations in Horndeski's most general second-order scalar-tensor theo…
Multi-field G-inflation
Tsutomu Kobayashi, Norihiro Tanahashi, Masahide Yamaguchi
We propose a multi-field extension of (generalized) G-inflation, based on covariant multi-galileons and their generalization preserving second-order field equations. We compute the…
Gravitational wave signal from massive gravity
A. Emir Gumrukcuoglu, Sachiko Kuroyanagi, Chunshan Lin +2
We discuss the detectability of gravitational waves with a time dependent mass contribution, by means of the stochastic gravitational wave observations. Such a mass term typically…
Instability in near-horizon geometries of even-dimensional Myers-Perry black holes
Norihiro Tanahashi, Keiju Murata
We study the gravitational, electromagnetic and scalar field perturbations on the near-horizon geometries of the even-dimensional extremal Myers-Perry black holes. By dimensional r…
Hawking temperature for near-equilibrium black holes
Shunichiro Kinoshita, Norihiro Tanahashi
We discuss the Hawking temperature of near-equilibrium black holes using a semiclassical analysis. We introduce a useful expansion method for slowly evolving spacetime, and evaluat…
Galileon Hairs of Dyson Spheres, Vainshtein's Coiffure and Hirsute Bubbles
Nemanja Kaloper, Antonio Padilla, Norihiro Tanahashi
We study the fields of spherically symmetric thin shell sources, a.k.a. Dyson spheres, in a {\it fully nonlinear covariant} theory of gravity with the simplest galileon field. We i…
Black holes in braneworld models
Norihiro Tanahashi, Takahiro Tanaka
In this review, we summarize current understandings of black hole solutions in various braneworld models, including the Arkani-Hamed-Dimopoulos-Dvali model, the Randall-Sundrum (RS…