Late-time cosmological phase transitions
- Chicago Univ., IL (USA) Fermi National Accelerator Lab., Batavia, IL (USA)
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 cold dark matter can be consistent with a late-time transition. 47 refs., 2 figs.
- Research Organization:
- Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
- Sponsoring Organization:
- DOE/ER; National Aeronautics and Space Administration (NASA); National Science Foundation (NSF)
- DOE Contract Number:
- AC02-76CH03000
- OSTI ID:
- 6230804
- Report Number(s):
- FNAL/C-90/245-A; CONF-9009325-4; ON: DE91006381; CNN: AST88-22595; NAGW1321; NAGW1340; TRN: 91-003397
- 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
- Country of Publication:
- United States
- Language:
- English
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640106* - Astrophysics & Cosmology- Cosmology