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.

20 pages, 8 figures

References in corpus (2)

• Theory and Numerics of Gravitational Waves from Preheating after Inflation
• A stochastic background of gravitational waves from hybrid preheating

Cited by in corpus (6)

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• Search for a stochastic background of 100-MHz gravitational waves with laser interferometers
• High-frequency corrections to the detector response and their effect on searches for gravitational waves
• Optimal Location of Two Laser-interferometric Detectors for Gravitational Wave Backgrounds at 100 MHz
• Resonant speed meter for gravitational wave detection
• A new gravitational wave background from the Big Bang