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Cosmological consequences of a first-order phase transition in the SU5 grand unified model

Alan H. Guth*

Erick J. Weinberg*

  • Center for Theoretical Physics, Laboratory for Nuclear Science and Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 and Stanford Linear Accelerator Center—P.O. Box 4349, Stanford, California 94305

  • Department of Physics, Columbia University, New York, New York 10027 and Stanford Linear Accelerator Center—P.O. Box 4349, Stanford, California 94305

  • *Present address.
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Phys. Rev. D 23, 876 – Published 15 February, 1981

DOI: https://doi.org/10.1103/PhysRevD.23.876

Abstract

The SU5 grand unified model is considered in the context of big-bang cosmology. If the Higgs potential contains a cubic term there is a first-order transition to the SU3×SU2×U1-symmetric phase. The bubble nucleation rate for this transition is calculated. For typical choices of parameters, the transition proceeds according to one of two scenarios depending on whether or not its rate is ever large relative to the expansion rate of the universe. Both possibilities lead to difficulties: In the former case the transition is rapidly completed, but leads to the production of too many superheavy magnetic monopoles. In the latter case monopole production is suppressed, but there is an extreme supercooling from which the universe never recovers.

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Phys. Rev. D 23, 876– Published 15 February, 1981
  • Received 3 November 1980

© 1981 American Physical Society

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