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Neutron displacement noise-free interferometer for gravitational-wave detection

Atsushi Nishizawa1,*, Shoki Iwaguchi2, Yanbei Chen3, Taigen Morimoto2, Tomohiro Ishikawa2, Bin Wu2, Izumi Watanabe2, Yuki Kawasaki2, Ryuma Shimizu2 et al.

Hirohiko Shimizu2,4, Masaaki Kitaguchi4,2, Yuta Michimura5, and Seiji Kawamura2,4

  • 1Research Center for the Early Universe (RESCEU), Graduate School of Science, The University of Tokyo, Tokyo 113-0033, Japan
  • 2Department of Physics, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8602, Japan
  • 3Theoretical Astrophysics 350-17, California Institute of Technology, Pasadena, California 91125, USA
  • 4Kobayashi-Maskawa Institute for the Origin of Particles and the Universe, Nagoya University, Nagoya, Aichi 464-8602, Japan
  • 5Department of Physics, University of Tokyo, Bunkyo, Tokyo 113-0033, Japan

  • *anishi@resceu.s.u-tokyo.ac.jp
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Phys. Rev. D 105, 124017 – Published 8 June, 2022

DOI: https://doi.org/10.1103/PhysRevD.105.124017

Abstract

An interferometer design that cancels all displacement noises of its test masses and maintains a gravitational-wave (GW) signal by combining multiple detector signals is called a displacement noise-free interferometer (DFI). The idea has been considered previously for a laser interferometer. However, a limitation of a laser DFI is that its sensitive frequency band is too high for astrophysical GW sources, ∼105  Hz even for a kilometer-sized interferometer. To circumvent this limitation, in this paper, we propose a neutron DFI, in which neutrons are used instead of light. Since neutrons have velocities much lower than the speed of light, the sensitive frequency band of a neutron DFI can be lowered down to ∼10−1  Hz. Therefore, a neutron DFI can be utilized for detecting GWs that are inaccessible by an ordinary laser interferometer on the ground.

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Phys. Rev. D 105, 124017– Published 8 June, 2022
  • Received 25 December 2021
  • Accepted 12 May 2022
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