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Gravitational Waves from Quasi-Circular Black Hole Binaries in Dynamical Chern-Simons Gravity
Kent Yagi, Nicolas Yunes, Takahiro Tanaka
Dynamical Chern-Simons gravity cannot be strongly constrained with current experiments because it reduces to General Relativity in the weak-field limit. This theory, however, intro…
Slowly Rotating Black Holes in Dynamical Chern-Simons Gravity: Deformation Quadratic in the Spin
Kent Yagi, Nicolas Yunes, Takahiro Tanaka
We derive a stationary and axisymmetric black hole solution to quadratic order in the spin angular momentum. The previously found, linear-in-spin terms modify the odd-parity sector…
Gravitational-wave standard siren without redshift identification
Atsushi Nishizawa, Kent Yagi, Atsushi Taruya +1
Proposed space-based gravitational-wave (GW) detectors such as DECIGO and BBO will detect neutron-star (NS) binaries and determine the luminosity distances to the binari…
Probing the Inhomogeneous Universe with Gravitational Wave Cosmology
Kent Yagi, Atsushi Nishizawa, Chul-Moon Yoo
If we assume that we live in the center of a spherical inhomogeneous universe, we can explain the apparent accelerating expansion of the universe without introducing the unknown da…
New Constraint on Scalar Gauss-Bonnet Gravity and a Possible Explanation for the Excess of the Orbital Decay Rate in a Low-Mass X-ray Binary
Kent Yagi
It was recently shown that a black hole (BH) is the only compact object that can acquire a scalar charge in scalar Gauss-Bonnet (sGB) theory under the small coupling approximation.…
Gravitational wave observations of galactic intermediate-mass black hole binaries with DECIGO Path Finder
Kent Yagi
DECIGO Path Finder (DPF) is a space-borne gravitational wave (GW) detector with sensitivity in the frequency band 0.1--100Hz. As a first step mission to DECIGO, it is aiming for la…