The first space-based gravitational-wave detectors

Phys. Rev. D 59, 027101 – Published 24 December 1998
R. R. Caldwell, Marc Kamionkowski, and Leven Wadley


Gravitational waves provide a laboratory for general relativity and a window to energetic astrophysical phenomena invisible with electromagnetic radiation. Several terrestrial detectors are currently under construction, and a space-based interferometer is envisioned for launch early next century to detect test-mass motions induced by waves of relatively short wavelength. Very-long-wavelength gravitational waves can be detected using the plasma in the early Universe as test masses; the motion induced in the plasma by a wave is imprinted onto the cosmic microwave background (CMB). While the signature of gravitational waves on the CMB temperature fluctuations is not unique, the polarization pattern can be used to unambiguously detect gravitational radiation. Thus, forthcoming CMB polarization experiments, such as the Microwave Anisotropy Probe and Planck, will be the first space-based gravitational-wave detectors.


  • Received 28 July 1998
  • Published 24 December 1998

© 1998 The American Physical Society

Authors & Affiliations

R. R. Caldwell*

  • Department of Physics and Astronomy, University of Pennsylvania, 209 South 33rd Street, Philadelphia, Pennsylvania 19104

Marc Kamionkowski and Leven Wadley

  • Department of Physics, Columbia University, 538 West 120th Street, New York, New York 10027

  • *Electronic address:
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