Akutsu Tomotada, Kawamura Seiji, Nishizawa Atsushi, Arai Koji, Yamamoto Kazuhiro, Tatsumi Daisuke, Nagano Shigeo, Nishida Erina, Chiba Takeshi, Takahashi Ryuichi, Sugiyama Naoshi, Fukushima Mitsuhiro, Yamazaki Toshitaka, Fujimoto Masa-Katsu
Department of Astronomy, University of Tokyo, Bunkyo, Tokyo 113-0033, Japan.
Phys Rev Lett. 2008 Sep 5;101(10):101101. doi: 10.1103/PhysRevLett.101.101101.
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.
本信函报告了通过激光干涉测量法在100兆赫兹频段搜索引力波随机背景的结果。我们开发了一种引力波探测器，它是一对基线长度为75厘米的同步回收（共振回收）干涉仪。每个干涉仪在100兆赫兹时的应变灵敏度约为10^(-16)赫兹^(-1/2)。通过在1000秒内对两个干涉仪的输出进行互相关分析，我们发现，在假设为平坦频谱的情况下，h_(100)^2Ω_gw < 6×10^(-25)是100兆赫兹附近2千赫兹带宽内引力波背景能量密度谱的上限。
