Abstract
Detection of gravitational waves (GWs) from merging binary black holes (BHs) by Advanced LIGO has ushered in the new era of GW astronomy. Many conceivable sources such as intermediate-mass BH binaries and white dwarf binaries, as well as stellar-mass BH inspirals, would emit GWs below 10 Hz. It is highly desirable to open a new window for GW astronomy in the infrasound frequency band. A low-frequency tensor detector could be constructed by combining six magnetically levitated superconducting test masses. Such a detector would be equally sensitive to GWs coming from anywhere in the sky, and would be capable of resolving the source direction and wave polarization. I will present the design concept of a new terrestrial GW detector, named SOGRO, which could reach a strain sensitivity of 10−19-10−21 Hz−1/2 at 0.1-10 Hz. Seismic and Newtonian gravity noises are serious obstacles in constructing terrestrial GW detectors at frequencies below 10 Hz. I will explain how these noises are rejected in SOGRO. I will also report the progress made in designing the platform and modelling its thermal noise.
Highlights
Detection of gravitational waves (GWs) from merging binary black holes (BHs) by the two Advanced LIGO detectors has ushered in the new era of GW astronomy [1,2,3]
SOGRO requires a large-scale cryogenic operation since the test masses must be levitated from a rigid platform and the entire platform needs to be cooled to 4.2 K or below to reduce its thermal noise
A wideband terrestrial tensor GW detector with a strain sensitivity of 10−19-10−21 Hz−1/2 for the frequency band of 0.1-10 Hz could be constructed by using six widely separated, magnetically levitated superconducting test masses
Summary
Detection of gravitational waves (GWs) from merging binary black holes (BHs) by the two Advanced LIGO (aLIGO) detectors has ushered in the new era of GW astronomy [1,2,3]. Paik et al [7] proposed a terrestrial tensor GW detector, SOGRO (Superconducting Omni-directional Gravitational Radiation Observatory), consisting of six levitated superconducting test masses , to cover the same frequency band. Such a detector would be sensitive to GWs coming from. SOGRO requires a large-scale cryogenic operation since the test masses must be levitated from a rigid platform and the entire platform needs to be cooled to 4.2 K or below to reduce its thermal noise. Our initial research effort was directed to conceptual design of the platformand modelling theplatformnoise
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