Growing inhomogeneities in cosmological Goldstone modes

Details Growing inhomogeneities in cosmological Goldstone modes Growing inhomogeneities in cosmological Goldstone modes

Aug 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992nuphb.380..557b&link_type=abstract

Nuclear Physics B, Volume 380, Issue 3, p. 557-572.

Physics

Nuclear Physics

Scientific paper

We examine the evolution of initial inhomogeneities in a Goldstone field in an expanding Friedmann-Robertson-Walker universe. We find subhorizon inhomogeneities grow, relative to the homogeneous state. This stems not from growing fluctuations - which simply redshift - but from rapid (ϱ ~ a-6) decay of the homogeneous state. We show how Goldstone modes escape assumptions - some inapplicable, some ill-founded - underpinning conventional analyses of cosmological fluctuations. Finally, we reconcile our analysis to standard cosmology, noting that the Goldstone evolution is essentially decoupled and dynamical.
This material is based upon work supported by NSF grants PHY-87-14654 (while the author was at Harvard University) and PHY91-06210.

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