Laser-interferometric Detectors for Gravitational Wave Background at 100 MHz : Detector Design and Sensitivity

Recently, observational searches for gravitational wave background (GWB) have developed and given direct and indirect constraints on the energy density of GWB in a broad range of frequencies. These constraints have already rejected some theoretical models of large GWB spectra. However, at 100 MHz, there is no strict upper limit from direct observation, though the indirect limit by He4 abundance due to big-bang nucleosynthesis exists. In this paper, we propose an experiment with laser interferometers searching GWB at 100 MHz. We considered three detector designs and evaluated the GW response functions of a single detector. As a result, we found that, at 100 MHz, the most sensitive detector is the design, a so-called synchronous recycling interferometer, which has better sensitivity than an ordinary Fabry-Perot Michelson interferometer by a factor of 3.3 at 100 MHz. We also give the best sensitivity achievable at 100 MHz with realistic experimental parameters.Comment: 20 pages, 8 figure

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application/pdfapplication/pdf国立情報学研究所平成19年度学術ポータル担当者研修（平成19年7月11日 名古屋大学会場／平成19年8月22日 NII会場）32conference objec

Laser-interferometric detectors for gravitational wave backgrounds at 100 MHz: Detector design and sensitivity

Recently, observational searches for gravitational wave background (GWB) have been developed and given direct and indirect constraints on the energy density of GWB in a broad range of frequencies. These constraints have already rejected some theoretical models of large GWB spectra. However, at 100 MHz, there is no strict upper limit from direct observation, though the indirect limit by 2He abundance due to big-bang nucleosynthesis exists. In this paper, we propose an experiment with laser interferometers searching GWB at 100 MHz. We considered three detector designs and evaluated the GW response functions of a single detector. As a result, we found that, at 100 MHz, the most sensitive detector is the design, a so-called synchronous recycling interferometer, which has better sensitivity than an ordinary Fabry-Perot Michelson interferometer by a factor of 3.3 at 100 MHz. When we select the arm length of 0.75 m and realistic optical parameters, the best sensitivity achievable is h ≈ 7.8 ×10^{-21} Hz^{-1/2} at 100 MHz with bandwidth ～2 kHz.journal articl

大脳基底核側坐核における情動的評価と行動計画

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モーフィング翼の内部構造としての多層構造化コンプライアント機構の提案

application/pdf航空宇宙技術. 2019, 18, P.151-159journal articl

Study of Time-Dependent CP Violation in B0→J/ψπ0 Decays

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Abstracts of Vol.59 Nos.3・4, March 2008

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