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High-frequency sound waves to eliminate a horizon in the mixmaster universe.From the linear wave equation for small-amplitude sound waves in a curved space-time, there is derived a geodesiclike differential equation for sound rays to describe the motion of wave packets. These equations are applied in the generic, nonrotating, homogeneous closed-model universe (the 'mixmaster universe,' Bianchi type IX). As for light rays described by Doroshkevich and Novikov (DN), these sound rays can circumnavigate the universe near the singularity to remove particle horizons only for a small class of these models and in special directions. Although these results parallel those of DN, different Hamiltonian methods are used for treating the Einstein equations.
Document ID
19730033748
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Chitre, D. M.
(Utah, University Salt Lake City, Utah, United States)
Date Acquired
August 7, 2013
Publication Date
December 15, 1972
Publication Information
Publication: Physical Review D - Particles and Fields
Subject Category
Physics, General
Accession Number
73A18550
Funding Number(s)
CONTRACT_GRANT: NASA ORDER R-21-002-010
Distribution Limits
Public
Copyright
Other

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