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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…
Post-Newtonian, Quasi-Circular Binary Inspirals in Quadratic Modified Gravity
Kent Yagi, Leo C. Stein, Nicolas Yunes +1
We consider a general class of quantum gravity-inspired, modified gravity theories, where the Einstein-Hilbert action is extended through the addition of all terms quadratic in the…
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…
Probing the size of extra dimension with gravitational wave astronomy
Kent Yagi, Norihiro Tanahashi, Takahiro Tanaka
In Randall-Sundrum II (RS-II) braneworld model, it has been conjectured according to the AdS/CFT correspondence that brane-localized black hole (BH) larger than the bulk AdS curvat…
Detector configuration of DECIGO/BBO and identification of cosmological neutron-star binaries
Kent Yagi, Naoki Seto
The primary target for the planned space-borne gravitational wave interferometers DECIGO/BBO is a primordial gravitational wave background (PGWB). However there exist astrophysical…