Search for a stochastic background of 100-MHz gravitational waves with laser interferometers.
This Letter reports the results of a search for a stochastic background of gravitational waves (GW) at 100 MHz by laser interferometry. We have developed a GW detector, which is a pair of 75-cm baseline synchronous recycling (resonant recycling) interferometers. Each interferometer has a strain sensitivity of approximately 10;{-16} Hz;{-1/2} at 100 MHz. By cross-correlating the outputs of the two interferometers within 1000 seconds, we found h{100};{2}Omega_{gw}<6 x 10;{25} to be an upper limit on the energy density spectrum of the GW background in a 2-kHz bandwidth around 100 MHz, where a flat spectrum is assumed.
Department of Astronomy, University of Tokyo, Bunkyo, Tokyo 113-0033, Japan. takutsu@gravity.mtk.nao.ac.jp
Tomotada
T
Akutsu
Seiji
S
Kawamura
Atsushi
A
Nishizawa
Koji
K
Arai
Kazuhiro
K
Yamamoto
Daisuke
D
Tatsumi
Shigeo
S
Nagano
Erina
E
Nishida
Takeshi
T
Chiba
Ryuichi
R
Takahashi
Naoshi
N
Sugiyama
Mitsuhiro
M
Fukushima
Toshitaka
T
Yamazaki
Masa-Katsu
MK
Fujimoto