Large-scale structure with gravitational waves. II. Shear

Fabian Schmidt and Donghui Jeong
Phys. Rev. D 86, 083513 – Published 8 October 2012

Abstract

The B (curl) mode of the correlation of galaxy ellipticities (shear) can be used to detect a stochastic gravitational wave background, such as that predicted by inflation. In this paper, we derive the tensor mode contributions to shear from both gravitational lensing and intrinsic alignments, using the gauge-invariant, full-sky results of Schmidt and Jeong {arXiv:1204.3625 [Phys. Rev. D (to be published)]}. We find that the intrinsic alignment contribution, calculated using the linear alignment model, is larger than the lensing contribution by an order of magnitude or more, if the alignment strength for tensor modes is of the same order as for scalar modes. This contribution also extends to higher multipoles. These results make the prospects for probing tensor modes using galaxy surveys less pessimistic than previously thought, though still very challenging.

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  • Received 30 May 2012

DOI:https://doi.org/10.1103/PhysRevD.86.083513

© 2012 American Physical Society

Authors & Affiliations

Fabian Schmidt1 and Donghui Jeong2

  • 1Theoretical Astrophysics, California Institute of Technology, Mail Code 350-17, Pasadena, California 91125, USA
  • 2Department of Physics and Astronomy, Johns Hopkins University, 3400 N. Charles Street, Baltimore, Maryland 21210, USA

See Also

Large-scale structure with gravitational waves. I. Galaxy clustering

Donghui Jeong and Fabian Schmidt
Phys. Rev. D 86, 083512 (2012)

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Vol. 86, Iss. 8 — 15 October 2012

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