Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2004-05-26
JCAP 0507 (2005) 009
Physics
High Energy Physics
High Energy Physics - Phenomenology
14 pages. Several references added
Scientific paper
10.1088/1475-7516/2005/07/009
The nature of axion cosmology is usually said to depend on whether the Peccei-Quinn (PQ) symmetry breaks before or after inflation. The PQ symmetry itself is believed to be an accident, so there is not necessarily a symmetry during inflation at all. We explore these issues in some simple models, which provide examples of symmetry breaking before and after inflation, or in which there is no symmetry during inflation and no phase transition at all. One effect of these observations is to relax the constraints from isocurvature fluctuations due to the axion during inflation. We also observe new possibilities for evading the constraints due to cosmic strings and domain walls, but they seem less generic.
Anisimov Alexey
Dine Michael
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