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Isocurvature cold dark matter fluctuationsAccording to Preskill et al. (1983), the axion field represents a particularly attractive candidate for the dark matter in the universe. In many respects it behaves like other forms of cold dark matter, such as massive gravitinos, photinos, and monopoles. It is, however, a pseudo-Goldstone boson of very low mass, and it is only because of rapid coherent oscillations of the field that it can dominate the mass density of the universe. In the present paper it is assumed that the isocurvature mode is dominant. The linear evolution calculations conducted do not depend upon specific details of particle physics. For this reason, the conducted discussion is applicable to any cold dark matter model with isocurvature perturbations. The results of the study lead to the conclusion that scale-invariant isocurvature perturbations do not seem an attractive possibility for the origin of large-scale structure. The findings strengthen the review that primordial adiabatic perturbations were the dominant fluctuations in the early stages of the Big Bang.
Document ID
19860040605
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Efstathiou, G.
(Cambridge University United Kingdom)
Bond, J. R.
(Stanford University CA; Canadian Institute for Theoretical Astrophysics, Toronto, Canada)
Date Acquired
August 12, 2013
Publication Date
January 1, 1986
Publication Information
Publication: Royal Astronomical Society, Monthly Notices
Volume: 218
ISSN: 0035-8711
Subject Category
Astrophysics
Accession Number
86A25343
Funding Number(s)
CONTRACT_GRANT: NAGW-299
Distribution Limits
Public
Copyright
Other

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