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Measuring the maximally allowed polarization states of the isotropic stochastic gravitational wave background with the ground-based detectors
Hidetoshi Omiya, Naoki Seto
We discuss the polarizational study of isotropic gravitational wave backgrounds with the second generation detector network, paying special attention to the impacts of adding LIGO-…
Correlation analysis for isotropic stochastic gravitational wave backgrounds with maximally allowed polarization degrees
Hidetoshi Omiya, Naoki Seto
We study correlation analysis for monopole components of stochastic gravitational wave backgrounds, including the maximally allowed polarization degrees. We show that, for typical…
Prospects of the local Hubble parameter measurement using gravitational waves from double neutron stars
Naoki Seto, Koutarou Kyutoku
Following the detection of the GW170817 signal and its associated electromagnetic emissions, we discuss the prospects of the local Hubble parameter measurement using double neutron…
Gravitational-wave cosmography with LISA and the Hubble tension
Koutarou Kyutoku, Naoki Seto
We propose that stellar-mass binary black holes like GW150914 will become a tool to explore the local Universe within ~100Mpc in the era of the Laser Interferometer Space Antenna (…
Probability distribution function for inclinations of merging compact binaries detected by gravitational wave interferometers
Naoki Seto
We analytically discuss probability distribution function (PDF) for inclinations of merging compact binaries whose gravitational waves are coherently detected by a network of groun…
The History of Inflation from Microwave Background Polarimetry and Laser Interferometry
Jerod Caligiuri, Arthur Kosowsky, William H. Kinney +1
A period of inflation in the early universe produces a nearly scale-invariant spectrum of gravitational waves over a huge range in wavelength. If the amplitude of this gravitationa…
Highly Eccentric Kozai Mechanism and Gravitational-Wave Observation for Neutron Star Binaries
Naoki Seto
The Kozai mechanism for a hierarchical triple system could reduce the merger time of inner eccentric binary emitting gravitational waves (GWs), and has been qualitatively explained…
Enhanced exploration for primordial black holes using pulsar timing arrays
Kazumi. Kashiyama, Naoki. Seto
We investigate the capability of pulsar timing arrays (PTAs) as a probe of primordial black holes (PBHs), which might constitute the Galactic dark matter. A PBH passing nearby the…
Geometrical Aspects on Parameter estimation of stochastic gravitational wave background: beyond the Fisher analysis
Naoki Seto, Koutarou Kyutoku
The maximum likelihood method is often used for parameter estimation in gravitational wave astronomy. Recently, an interesting approach was proposed by Vallisneri to evaluate the d…
Relativistic Resonant Relations between Massive Black Hole Binary and Extreme Mass Ratio Inspiral
Naoki Seto
One component of a massive black hole binary (MBHB) might capture a small third body, and then a hierarchical, inclined triple system would be formed. With the post-Newtonian appro…
Resonant Trapping of Stars by Merging Massive Black Hole Binaries
Naoki Seto, Takayuki Muto
A massive black hole binary might resonantly trap a star (e.g. a white dwarf) and the gas released by its tidal disruption might emit electromagnetic wave signals around the coales…
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…
Relativistic Astrophysics with Resonant Multiple Inspirals
Naoki Seto, Takayuki Muto
We show that a massive black hole binary might resonantly trap a small third body (e.g. a neutron star) down to a stage when the binary becomes relativistic due to its orbital deca…
Search for Memory and Inspiral Gravitational Waves from Super-Massive Binary Black Holes with Pulsar Timing Arrays
Naoki Seto
The merger of a super-massive binary black hole (SBBH) is one of the most extreme events in the universe with a huge amount of energy released by gravitational radiation. Although…