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Title:
Acceleration from Modified Gravity: Lessons from Worked Examples
Authors:
Hu, Wayne
Affiliation:
AA(Kavli Institute for Cosmological Physics, Department of Astronomy & Astrophysics, Enrico Fermi Institute, University of Chicago, Chicago, IL 60637; This work was supported by the KICP through grants NSF PHY-0114422 and NSF PHY-0551142, U.S. Dept. of Energy contract DE-FG02-90ER-40560 and the David and Lucile Packard Foundation. I thank W. Fang, M. Lima, L. Lombriser, H. Oyaizu, I. Sawicki, F. Schmidt, YS. Song, A. Upadhye for fruitful collaborations; L. Hui, J. Khoury, K. Koyama, B. Wald for illuminating discussions; GGI and the organizers of the New Horizons workshop for their hospitality.)
Publication:
Nuclear Physics B Proceedings Supplements, Volume 194, p. 230-238.
Publication Date:
10/2009
Origin:
ELSEVIER
Abstract Copyright:
Elsevier B.V.
DOI:
10.1016/j.nuclphysbps.2009.07.086
Bibliographic Code:
2009NuPhS.194..230H

Abstract

>I examine how two specific examples of modified gravity explanations of cosmic acceleration help us understand some general problems confronting cosmological tests of gravity: how do we distinguish modified gravity from dark energy if they can be made formally equivalent? how do we parameterize deviations according to physical principles with sufficient generality, yet focus cosmological tests into areas that complement our existing knowledge of gravity? how do we treat the dynamics of modifications which necessarily involve non-linearities that preclude superposition of forces? The modified action f(R) and DGP braneworld models provide insight on these question as fully-worked examples whose expansion history, linear perturbation theory, and most recently, non-linear N-body and force-modification field dynamics of cosmological simulations are available for study.
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