Laser-interferometric Detectors for Gravitational Wave Background at 100 MHz : Detector Design and Sensitivity
Abstract
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.
Cite
@article{arxiv.0710.1944,
title = {Laser-interferometric Detectors for Gravitational Wave Background at 100 MHz : Detector Design and Sensitivity},
author = {Atsushi Nishizawa and Seiji Kawamura and Tomotada Akutsu and Koji Arai and Kazuhiro Yamamoto and Daisuke Tatsumi and Erina Nishida and Masa-aki Sakagami and Takeshi Chiba and Ryuichi Takahashi and Naoshi Sugiyama},
journal= {arXiv preprint arXiv:0710.1944},
year = {2008}
}
Comments
20 pages, 8 figures