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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…
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…
Gravitational wave diagnosis of a circumbinary disk
Kimitake Hayasaki, Kent Yagi, Takahiro Tanaka +1
When binary black holes are embedded in a gaseous environment, a rotating disk surrounding them, the so-called circumbinary disk, will be formed. The binary exerts a gravitational…
Direct Measurement of the Positive Acceleration of the Universe and Testing Inhomogeneous Models under Gravitational Wave Cosmology
Kent Yagi, Atsushi Nishizawa, Chul-Moon Yoo
One possibility for explaining the apparent accelerating expansion of the universe is that we live in the center of a spherically inhomogeneous universe. Although current observati…
Cosmology with space-based gravitational-wave detectors --- dark energy and primordial gravitational waves ---
Atsushi Nishizawa, Kent Yagi, Atsushi Taruya +1
Proposed space-based gravitational-wave (GW) detectors such as DECIGO and BBO will detect ~10^6 neutron-star (NS) binaries and determine the luminosity distances to the binaries wi…