955 citations · 3.9k across the 84 of their papers we have counts for
31 papers · 1 filter
Non-Gaussianity test for discriminating gravitational wave backgrounds around 0.1-1Hz
Naoki Seto
We propose a non-Gaussianity test for gravitational wave backgrounds by combining data streams of multiple detectors. This simple method allows us to check whether a detected backg…
Detecting Planets around Compact Binaries with Gravitational Wave Detectors in Space
Naoki Seto
I propose a method to detect planets around compact binaries that are strong sources of gravitational radiation. This approach is to measure gravitational-wave phase modulations in…
Polarization analysis of gravitational-wave backgrounds from the correlation signals of ground-based interferometers: measuring a circular-polarization mode
Naoki Seto, Atsushi Taruya
The Stokes V parameter characterizes asymmetry of amplitudes between right- and left-handed waves, and non-vanishing value of the V parameter yields a circularly polarized signal.…
Measuring a Parity Violation Signature in the Early Universe via Ground-based Laser Interferometers
Naoki Seto, Atsushi Taruya
We show that pairs of widely separated interferometers are advantageous for measuring the Stokes parameter V of a stochastic background of gravitational waves. This parameter chara…
Searching for primordial black hole dark matter with pulsar timing arrays
Naoki Seto, Asantha Cooray
We discuss the possibility of detecting the presence of primordial black holes (PBHs), such as those that might account for galactic dark matter, using modification of pulsar timin…
Quest for circular polarization of gravitational wave background and orbits of laser interferometers in space
Naoki Seto
We show that isotropic component of circular polarization of stochastic gravitational wave background can be explored by breaking two dimensional configuration of multiple laser in…
Prospects for direct detection of circular polarization of gravitational-wave background
Naoki Seto
We discussed prospects for directly detecting circular polarization signal of gravitational wave background. We found it is generally difficult to probe the monopole mode of the si…
Prospects of LIGO for constraining inclination of merging compact binaries associated with three-dimensionally localized short-hard GRBs
Naoki Seto
We study prospects of a method to constrain the inclination of a coalescing compact binary by detecting its gravitational waves associated with a three-dimensionally localized (dir…
Did WMAP see Moving Local Structures?
Asantha Cooray, Naoki Seto
The divergence of the momentum density field of the large scale structure generates a secondary anisotropy contribution to the Cosmic Microwave Background (CMB). While the effect i…
Gravitational Wave Astrometry for Rapidly Rotating Neutron Stars and Estimation of Their Distances
Naoki Seto
We discuss an astrometric timing effect on data analysis of continuous gravitational waves from rapidly rotating isolated neutron stars. Special attention is directed to the possib…
Can LISA Resolve Distance to the Large Magellanic Cloud?
Asantha Cooray, Naoki Seto
The Laser Interferometer Space Antenna (LISA) is expected to detect N ~ 22 [x10^(+/- 1)] close white dwarf binaries in the Large Magellanic Cloud (LMC) through their gravitational…
Cosmological Constraints on the Very Low Frequency Gravitational-Wave Background
Naoki Seto, Asantha Cooray
While there are no strong observational constraints on the gravitational wave background across six or more orders of magnitude between 10^{-16} Hz and 10^{-10} Hz and it is diffic…
Probing the largest scale structure in the universe with polarization map of galaxy clusters
Naoki Seto, Elena Pierpaoli
We introduce a new formalism to describe the polarization signal of galaxy clusters on the whole sky. We show that a sparsely sampled, half-sky map of the cluster polarization sign…
Search for Small-Mass Black Hole Dark Matter with Space-Based Gravitational Wave Detectors
Naoki Seto, Asantha Cooray
The high sensitivity of upcoming space-based gravitational wave detectors suggests the possibility that if halo dark matter were composed of primordial black holes (PBHs) with mass…
LISA Measurement of Gravitational Wave Background Anisotropy: Hexadecapole Moment via a Correlation Analysis
Naoki Seto, Asantha Cooray
We discuss spatial fluctuations in the gravitational wave background arising from unresolved Galactic binary sources, such as close white dwarf binaries, due to the fact the galact…
Graviton Mass from Close White Dwarf Binaries Detectable with LISA
Asantha Cooray, Naoki Seto
The arrival times of gravitational waves and optical light from orbiting binaries provide a mechanism to understand the propagation speed of gravity when compared to that of light…
Optical Identification of Close White Dwarf Binaries in the LISA Era
Asantha Cooray, Alison J. Farmer, Naoki Seto
The Laser Interferometer Space Antenna (LISA) is expected to detect close white dwarf binaries (CWDBs) through their gravitational radiation. Around 3000 binaries will be spectrall…
Strong Gravitational Lensing and Localization of Merging Massive Black Hole Binaries with LISA
Naoki Seto
We study how the angular resolution of LISA for merging massive black-hole binaries would be improved if we observe multiple gravitational wave ``images'' due to strong gravitation…
Parameter estimation for Galactic binaries by LISA
Ryuichi Takahashi, Naoki Seto
We calculate how accurately parameters of the short-period binaries $(10^{-4} {Hz} \lsim f\lsim 10^{-2} {Hz})$ will be determined from the gravitational waves by LISA. In our analy…
Long Term Operation of LISA and Galactic Close White Dwarf Binaries
Naoki Seto
The binary confusion noise spectrum at LISA band depends strongly on observational period and abundance of Galactic close white dwarf binaries (CWDBs). We have investigated how the…
Proposal for Determining the Total Masses of Eccentric Binaries Using Signature of Periastron Advance in Gravitational Waves
Naoki Seto
We propose a new method for determining total masses of low frequency eccentric binaries (such as, neutron star binaries with orbital frequency $f\gsim 10^{-3}$Hz) from their gravi…
Possibility of Direct Measurement of the Acceleration of the Universe Using 0.1 Hz Band Laser Interferometer Gravitational Wave Antenna in Space
Naoki Seto, Seiji Kawamura, Takashi Nakamura
It may be possible to construct a laser interferometer gravitational wave antenna in space with at in this century. We show possible spe…
Numerical Analyses of Weakly Nonlinear Velocity-Density Coupling
Naoki Seto, Naoshi Sugiyama
We study evolution of various statistical quantities of smoothed cosmic density and velocity fields using N-body simulations. The parameter character…
Evolution of Power Spectrum in Non-Gaussian Models
Naoki Seto
Evolution of power spectrum is studied for non-Gaussian models of structure formation. We generalize the dark-matter-approach to these models and find that the evolved spectrum at…