Some aspects of axion cosmology in unified and superstring models
1987; Elsevier BV; Volume: 283; Linguagem: Inglês
10.1016/0550-3213(87)90288-4
ISSN1873-1562
AutoresS. M. Barr, Kiwoon Choi, Jihn E. Kim,
Tópico(s)Particle physics theoretical and experimental studies
ResumoWe discuss the two cosmological problems arising from the axion degrees of freedom of the superstring models: the axion energy problem and the axionic domain wall problem in the standard big-bang cosmology. The domain wall problem is comprehensively discussed with an emphasis on the mechanism for naturally having N = 1. A generalization of this mechanism with several global U(1)s and several unbroken non-abelian groups is also given. We point out that the success of this mechanism is related to the possibility of making abundant axionic strings in the early universe.
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