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Title: Late-time cosmological phase transitions

It is shown that the potential galaxy formation and large-scale structure problems of objects existing at high redshifts (Z {approx gt} 5), structures existing on scales of 100M pc as well as velocity flows on such scales, and minimal microwave anisotropies ({Delta}T/T) {approx lt} 10{sup {minus}5} can be solved if the seeds needed to generate structure form in a vacuum phase transition after decoupling. It is argued that the basic physics of such a phase transition is no more exotic than that utilized in the more traditional GUT scale phase transitions, and that, just as in the GUT case, significant random gaussian fluctuations and/or topological defects can form. Scale lengths of {approximately}100M pc for large-scale structure as well as {approximately}1 M pc for galaxy formation occur naturally. Possible support for new physics that might be associated with such a late-time transition comes from the preliminary results of the SAGE solar neutrino experiment, implying neutrino flavor mixing with values similar to those required for a late-time transition. It is also noted that a see-saw model for the neutrino masses might also imply a tau neutrino mass that is an ideal hot dark matter candidate. However, in general either hot or coldmore » dark matter can be consistent with a late-time transition. 47 refs., 2 figs.« less
Authors:
 [1]
  1. (Chicago Univ., IL (USA) Fermi National Accelerator Lab., Batavia, IL (USA))
Publication Date:
OSTI Identifier:
6230804
Report Number(s):
FNAL/C-90/245-A; CONF-9009325--4
ON: DE91006381; CNN: AST88-22595; NAGW1321; NAGW1340; TRN: 91-003397
DOE Contract Number:
AC02-76CH03000
Resource Type:
Conference
Resource Relation:
Conference: International Union of Pure and Applied Physics (IUPAP) conference on primordial nucleosynthesis and evolution of the early universe, Tokyo (Japan), 3-8 Sep 1990
Research Org:
Fermi National Accelerator Lab., Batavia, IL (USA)
Sponsoring Org:
DOE/ER; NASA; NSF
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; INFLATIONARY UNIVERSE; PHASE TRANSFORMATIONS; GALACTIC EVOLUTION; GRAND UNIFIED THEORY; MICROWAVE RADIATION; NONLUMINOUS MATTER; RELICT RADIATION; SOLAR NEUTRINOS; COSMOLOGICAL MODELS; ELECTROMAGNETIC RADIATION; ELEMENTARY PARTICLES; FERMIONS; FIELD THEORIES; LEPTONS; MASSLESS PARTICLES; MATHEMATICAL MODELS; NEUTRINOS; PARTICLE MODELS; RADIATIONS; SOLAR PARTICLES; SOLAR RADIATION; STELLAR RADIATION; UNIFIED GAUGE MODELS; UNIFIED-FIELD THEORIES 640106* -- Astrophysics & Cosmology-- Cosmology