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Effect of Inhomogeneity on Primordial Black Hole Formation in the Matter Dominated Era
Takafumi Kokubu, Koutarou Kyutoku, Kazunori Kohri +1
We investigate the effect of inhomogeneity on primordial black hole formation in the matter dominated era. In the gravitational collapse of an inhomogeneous density distribution, a…
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 (…
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…