Taishi Katsuragawa

Central China Normal University

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Co-Authors

Shin’ichi Nojiri

Nagoya University

Masahiro Yoshimoto

Japan Atomic Energy Agency

Takashi Asada

Ochanomizu University

G. De Lellis

Istituto Nazionale di Fisica Nucleare, Sezione di Napoli

A. Umemoto

University of Tsukuba

N. D’Ambrosio

Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali del Gran Sasso

A. Di Crescenzo

Istituto Nazionale di Fisica Nucleare, Sezione di Napoli

V. Tioukov

Istituto Nazionale di Fisica Nucleare, Sezione di Napoli

F. Pupilli

University of Padua

K. Hakamata

Hamamatsu Photonics (Japan)

Cooperative Institutions

Nagoya University

102

Centre National de la Recherche Scientifique

Institut National de Physique Nucléaire et de Physique des Particules

Istituto Nazionale di Fisica Nucleare, Sezione di Napoli

Istituto Nazionale di Fisica Nucleare

The University of Tokyo

Laboratoire d’Annecy de Physique des Particules

European Organization for Nuclear Research

Kyoto University

University of Naples Federico II

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WIMP tracking with cryogenic nuclear emulsion

Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment (2016)

Mitsuhiro Kimura T. Naka S. Furuya Takashi Asada Taishi Katsuragawa

Nuclear emulsion

Stopping power

Recoil

Photographic emulsion

Tracking (education)

Electron capture

10.1016/j.nima.2016.06.052

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Citations (10)

Stability and Anti-evaporation of the Schwarzschild-de Sitter Balck Holes in Bigravity

arXiv (Cornell University) (2014)

Taishi Katsuragawa Shin’ichi Nojiri

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Gravitational waves in F(R) gravity: Scalar waves and the chameleon mechanism

Physical review. D/Physical review. D. (2019)

Taishi Katsuragawa Tomohiro Nakamura Taishi Ikeda Salvatore Capozziello

We discuss the scalar mode of gravitational waves emerging in the context of $F(R)$ gravity by taking into account the chameleon mechanism. Assuming a toy model with a specific matter distribution to reproduce the environment of detection experiment by a ground-based gravitational wave observatory, we find that the chameleon mechanism remarkably suppresses the scalar wave in the atmosphere of Earth, compared with the tensor modes of the gravitational waves. We also discuss the possibility to detect and constrain scalar waves by the current gravitational observatories and advocate a necessity of the future space-based observations.

Einstein Telescope

10.1103/physrevd.99.124050

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Citations (46)

Cosmic history of chameleonic dark matter in F(R) gravity

Physical review. D/Physical review. D. (2018)

Taishi Katsuragawa Shinya Matsuzaki

We study the cosmic history of the scalaron in $F(R)$ gravity with constructing the time evolution of the cosmic environment and discuss the chameleonic dark matter based on the chameleon mechanism in the early and current Universe. We then find that the scalaron can be a dark matter. We also propose an interesting possibility that the $F(R)$ gravity can address the coincidence problem.

10.1103/physrevd.97.064037

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Citations (27)

Palatini-Born-Infeld Gravity, Bouncing Universe, and Black Hole Formation

arXiv (Cornell University) (2014)

Meguru Komada Shin’ichi Nojiri Taishi Katsuragawa

We consider the Palatini formalism of the Born-Infeld gravity. In the Palatini formalism, the propagating mode is only graviton, whose situation is different from that in the metric formalism. We discuss about the FRW cosmology by using an effective potential. Especially we consider the condition that the bouncing could occur. We also give some speculations about the black hole formation

Formalism (music)

Friedmann–Lemaître–Robertson–Walker metric

f(R) gravity

10.48550/arxiv.1409.1663

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Citations (1)

Nuclear Emulsion Technology and Directional Dark Matter Study

T. Naka Takashi Asada Taishi Katsuragawa Masahiro Yoshimoto A. Umemoto

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Solar system tests in covariant f(Q) gravity

arXiv (Cornell University) (2024)

Wenyi Wang Kun Hu Taishi Katsuragawa

We study the Solar System constraints on covariant $f(Q)$ gravity. The covariant $f(Q)$ theory is described by the metric and affine connection, where both the torsion and curvature vanish. Considering a model including a higher nonmetricity-scalar correction, $f(Q)= Q +\alpha Q^{n} - 2\Lambda$, we derive static and spherically symmetric solutions, which represent the Schwarzschild-de Sitter solution with higher-order corrections, for two different ansatz of the affine connection. On the obtained spacetime solutions, we investigate the perihelion precession, light deflection, Shapiro delay, Cassini constraint, and gravitational redshift in the $f(Q)$ gravity. We place bounds on the parameter $\alpha$ with $n=2, 3$ in our model of $f(Q)$ gravity, using various observational data in the Solar System.

10.48550/arxiv.2412.17463

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Noether current from surface term, Virasoro algebra, and black hole entropy in bigravity

Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D, Particles, fields, gravitation, and cosmology (2013)

Taishi Katsuragawa Shin’ichi Nojiri

We consider the static, spherically symmetric black hole solutions in bigravity theory for minimal model with a condition $f_{\mu \nu} = C^{2} g_{\mu \nu}$ and evaluate the entropy for black holes. In this condition, we show that there exists the Schwarzschild solution for $C^{2} = 1$, which is unique consistent solution. We examine how the massive spin-2 field contributes and affects to the Bekenstein-Hawking entropy corresponding to Einstein gravity. In order to obtain the black hole entropy, we use a recently proposed approach which use Virasoro algebra and central charge corresponding to surface term in the gravitational action.

Virasoro algebra

Central charge

Black hole (networking)

10.1103/physrevd.87.104032

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Citations (14)

Theoretical and experimental constraints on early-universe models in $F(R)$ gravity

arXiv (Cornell University) (2024)

Hua Chen Taishi Katsuragawa Shin’ichi Nojiri Taotao Qiu

This work investigates Early Dark Energy (EDE) scenarios as a potential precombination solution to the Hubble tension problem in the $F(R)$ gravity theory. We first develop a dimensionless quantity to visualize the density ratio between the EDE field and matter. Following existing scenarios, we then discuss conditions under which the Hubble tension could be alleviated by introducing a temporary injection of $10\%$ fractional energy around the time of matter-radiation equality between $z=10^{3}-10^{4}$. We further confront these models with local gravity tests and find inconsistencies with observations. Taking a broader view, we convert constraints from local gravity tests into constraints for general EDE in $F(R)$ gravity. We eventually arrive at a no-go theorem for $F(R)$ gravity, which restricts nontrivial modifications to General Relativity in the early universe.

10.48550/arxiv.2406.16503

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Properties of Homothetic Solutions in Bigravity

Taishi Katsuragawa

Homothetic transformation

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