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Causal compensated perturbations in cosmologyA theoretical framework is developed to calculate linear perturbations in the gravitational and matter fields which arise causally in response to the presence of stiff matter sources in a FRW cosmology. It is shown that, in order to satisfy energy and momentum conservation, the gravitational fields of the source must be compensated by perturbations in the matter and gravitational fields, and the role of such compensation in containing the initial inhomogeneities in their subsequent evolution is discussed. A complete formal solution is derived in terms of Green functions for the perturbations produced by an arbitrary source in a flat universe containing cold dark matter. Approximate Green function solutions are derived for the late-time density perturbations and late-time gravitational waves in a universe containing a radiation fluid. A cosmological energy-momentum pseudotensor is defined to clarify the nature of energy and momentum conservation in the expanding universe.
Document ID
19910033161
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Veeraraghavan, Shoba
(Harvard-Smithsonian Center for Astrophysics, Cambridge, MA; California, University Berkeley, United States)
Stebbins, Albert
(Canadian Institute for Theoretical Astrophysics Toronto, Canada)
Date Acquired
August 15, 2013
Publication Date
December 10, 1990
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 365
ISSN: 0004-637X
Subject Category
Astrophysics
Accession Number
91A17784
Funding Number(s)
CONTRACT_GRANT: NSF INT-87-15411
CONTRACT_GRANT: NGR-05-003-578
Distribution Limits
Public
Copyright
Other

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