Newtonian noise (or gravity gradient noise) is one of the principal noises for ground-based GW detectors, especially below 10 Hz. In this study, we estimate the NN caused by the acoustic field inside an underground facility for the KAGRA and further detectors based on the infrasound sensors' data at the KAGRA site.
The induced gravitational wave signal can be affected by the modification of the sound speed $c^2_s$ and the equation of state parameter $w$ at horizon reentry. Inspired by the occurrence of phase transitions in various theories beyond the Standard Model (SM), we conducted numerical simulations to assess the induced gravitational waves generated by a hypothetical smooth transition beyond the...
In 2015, gravitational wave was first detected and it was from binary black hole. After this event, many gravitational wave events from binary black hole were detected. However, including first detected gravitational event, origin of binary black hole observed by gravitational wave is not solved. To solve this, first we made mass distribution of 1year gravitational wave observation and mass...
Circular polarized cosmological gravitational wave background may provide evidence of possible parity violation predicted by the e.g., Chern-Simon theory. However, Circular polarized astrophysical gravitational wave background may also exist with detectable amplitudes, if their source distribution is anisotropic. Therefore, we need to develop a method for all-sky search for possible circular...
