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Large-scale structure with gravitational waves. II. Shear

Schmidt, Fabian and Jeong, Donghui (2012) Large-scale structure with gravitational waves. II. Shear. Physical Review D, 86 (8). Art. No. 083513. ISSN 2470-0010.

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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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Additional Information:© 2012 American Physical Society. Received 30 May 2012; published 8 October 2012. We would like to thank Jonathan Blazek, Chris Hirata, Marc Kamionkowski, Eiichiro Komatsu, Samuel Gralla, Uroš Seljak, and Masahiro Takada for helpful discussions. F. S. is supported by the Gordon and Betty Moore Foundation at Caltech. D. J. was supported by NASA NNX12AE86G.
Group:Moore Center for Theoretical Cosmology and Physics
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Gordon and Betty Moore FoundationUNSPECIFIED
Issue or Number:8
Classification Code:PACS: 98.65.Dx, 98.65.-r, 98.80.Jk
Record Number:CaltechAUTHORS:20121115-133417401
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:35493
Deposited By: Jason Perez
Deposited On:15 Nov 2012 22:43
Last Modified:03 Oct 2019 04:28

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