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Spin wave optics for gravitational waves lensed by a Kerr black hole

Autor: Kubota, Kei-ichiro, Arai, Shun, Motohashi, Hayato, Mukohyama, Shinji

Gravitational waves exhibit the unique signature of their spin-2 nature in processes of wave scattering, due to the interaction between spin and a background spacetime. Since the spin effect is more pronounced for longer wavelengths and gravitational

Externí odkaz: http://arxiv.org/abs/2408.03289

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On spin optics for gravitational waves lensed by a rotating object

Autor: Kubota, Kei-ichiro, Arai, Shun, Mukohyama, Shinji

Publikováno v: Phys.Rev.D 109 (2024) 14, 044027

We study gravitational lensing of gravitational waves taking into account the spin of a graviton coupled with a dragged spacetime made by a rotating object. We decompose the phase of gravitational waves into helicity-dependent and independent compone

Externí odkaz: http://arxiv.org/abs/2309.11024

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Inflationary $\alpha$-Attractor Models with Singular Derivative of Potential

Autor: Kubota, Kei-ichiro, Matsui, Hiroki, Terada, Takahiro

Publikováno v: JCAP 07 (2023) 011

A generalization of inflationary $\alpha$-attractor models (``polynomial $\alpha$-attractor'') was recently proposed by Kallosh and Linde, in which the potential involves logarithmic functions of the inflaton so that the derivative of the potential b

Externí odkaz: http://arxiv.org/abs/2302.03955

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Propagation of scalar and tensor gravitational waves in Horndeski theory

Autor: Kubota, Kei-ichiro, Arai, Shun, Mukohyama, Shinji

Publikováno v: Phys.Rev.D 107 (2023) 6, 064002

Gravitational waves travel through the distributions of matter and dark energy during propagation. For this reason, gravitational waves emitted from binary compact objects serve as a useful tool especially to probe the nature of dark energy. The geom

Externí odkaz: http://arxiv.org/abs/2209.00795

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