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Second-order weak lensing from modified gravity

Vanderveld, R. Ali and Caldwell, Robert R. and Rhodes, Jason (2011) Second-order weak lensing from modified gravity. Physical Review D, 84 (12). Art. No. 123510. ISSN 2470-0010.

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We explore the sensitivity of weak gravitational lensing to second-order corrections to the spacetime metric within a cosmological adaptation of the parametrized post-Newtonian framework. Whereas one might expect nonlinearities of the gravitational field to introduce non-Gaussianity into the statistics of the lensing convergence field, we show that such corrections are actually always small within a broad class of scalar-tensor theories of gravity. We show this by first computing the weak lensing convergence within our parametrized framework to second order in the gravitational potential, and then computing the relevant post-Newtonian parameters for scalar-tensor gravity theories. In doing so we show that this potential systematic factor is generically negligible, thus clearing the way for weak lensing to provide a direct tracer of mass on cosmological scales for a wide class of gravity theories despite uncertainties in the precise nature of the departures from general relativity.

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Additional Information:© 2011 American Physical Society. Received 8 September 2011; published 12 December 2011. We thank Wayne Hu, Mark Wyman, Scott Dodelson, and Christopher Berry for useful conversations. This research was carried out in part at the Jet Propulsion Laboratory, run by the California Institute of Technology under a contract from NASA, and Dartmouth College and was funded through the JPL Strategic University Research Partnership (SURP) Program. We also acknowledge the support of the Kavli Institute for Cosmological Physics at the University of Chicago through NSF Grant Nos. PHY-0114422 and PHY-0551142 and an endowment from the Kavli Foundation and its founder Fred Kavli.
Funding AgencyGrant Number
JPL Strategic University Research Partnership (SURP) ProgramUNSPECIFIED
University of Chicago Kavli Institute for Cosmological PhysicsUNSPECIFIED
Kavli FoundationUNSPECIFIED
Issue or Number:12
Classification Code:PACS: 98.80.-k, 04.25.-g, 04.50.Kd
Record Number:CaltechAUTHORS:20120113-094437824
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:28773
Deposited By: Tony Diaz
Deposited On:17 Jan 2012 22:48
Last Modified:03 Oct 2019 03:35

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