3 citations · 3 across the 1 of their papers we have counts for
7 papers
Confronting Inflation Models with the Coming Observations on Primordial Gravitational Waves
Taotao Qiu, Taishi Katsuragawa, Shulei Ni
The recent observations from CMB have imposed a very stringent upper-limit on the tensor/scalar ratio of inflation models, , which indicates that the primordial grav…
Dark matter candidate induced by Horndeski theory: dark matter halo and cosmological evolution
Jiaming Shi, Taishi Katsuragawa, Taotao Qiu
We study spherically symmetric solutions with a scalar field in the shift-symmetric subclass of the Horndeski theory. Constructing an effective energy-momentum tensor of the scalar…
Big Bang Nucleosynthesis Hunts Chameleon Dark Matter
Hua Chen, Taishi Katsuragawa, Shinya Matsuzaki +1
We study the chameleon field dark matter, dubbed \textit{scalaron}, in gravity in the Big Bang Nucleosynthesis (BBN) epoch. With an -correction term required to solve…
Gravitational Waves in Gravity: Scalar Waves and the Chameleon Mechanism
Taishi Katsuragawa, Tomohiro Nakamura, Taishi Ikeda +1
We discuss the scalar mode of gravitational waves emerging in the context of gravity by taking into account the chameleon mechanism. Assuming a toy model with a specific mat…
Screened and Unscreened Solutions for Relativistic Star in de Rham-Gabadadze-Tolley (dRGT) Massive Gravity
Masashi Yamazaki, Taishi Katsuragawa, Sergei D. Odintsov +1
We study the static and spherical symmetric (SSS) configurations in the non-minimal model of the de Rham-Gabadadze-Tolley (dRGT) massive gravity with a flat reference metric. Consi…
gravity in the early Universe: Electroweak phase transition and chameleon mechanism
Taishi Katsuragawa, Shinya Matsuzaki, Eibun Senaha
It is widely believed that the screening mechanism is an essential feature for the modified gravity theory. Although this mechanism has been examined thoroughly in the past decade,…