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Gravitational slip as a test of alternative gravity theories.

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Call No.	QB361 .D36 2009
Author	Daniel, Scott Foster.
Title	Gravitational slip as a test of alternative gravity theories.
Date	2009
Abstract	Cosmic acceleration could be an effect of a "dark energy" fluid pervading the Universe. It could also be an indication that general relativity is not the correct theory of gravity at cosmological length scales. Unfortunately, observations of the cosmic acceleration alone provide insufficient data to allow us to distinguish between these two possibilities. Cosmic perturbation theory may be able to relieve this uncertainty. Without positing a specific alternative gravity theory, we parametrize departures from general relativity in terms of a redshift-dependent, scale-independent gravitational slip between the Newtonian and longitudinal potentials appearing in the perturbed Robertson-Walker metric. We calculate the effects of non-zero values of this new parameter on linear and quasi-linear order cosmological perturbation theory. We find that existing data sets are consistent with unmodified general relativity with a cosmological constant at the ∼10% level. We discuss the ability of future work, both in the form of more precise experiments and more detailed theoretical calculations, to either refine or refute this observation.
Description	xiii, 100 leaves : ill. 28 cm.
Format	application/pdf
Advisor	Caldwell, Robert, Gleiser, Marcelo, Wegner, Gary, Cooray, Asantha
Subject	Perturbation (Astronomy). Gravity. Cosmology. Relativity (Physics).
College	Dartmouth College -- Department of Physics and Astronomy.
Issuing Body	Dartmouth Dissertations are made available through the Dartmouth Digital Library.
Degree	Thesis (Ph.D.)--Dartmouth College.
Copyright	All rights reserved. No part of this book may be reproduced in any form by any electronic or mechanical means without permission in writing from the author.
DOI	http://dx.doi.org/10.1349/ddlp.264

Title	Page 1
Format	application/pdf
Issuing Body	Dartmouth Dissertations are made available through the Dartmouth Digital Library.
Degree	Thesis (Ph.D.)--Dartmouth College.
Full Text	GRAVITATIONAL SLIP AS A TEST OF ALTERNATIVE GRAVITY THEORIES A Thesis Submitted to the Faculty in partial fulfillment of the requirements for the degree of Doctor of Philosophy in Physics and Astronomy by Scott Foster Daniel DARTMOUTH COLLEGE Hanover, New Hampshire 10 April 2009 Examining Committee: (chair) Robert Caldwell Marcelo Gleiser Gary Wegner Asantha Cooray Brian W. Pogue, Ph.D. Dean of Graduate Studies

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