Textures and semi-local strings in supersymmetric hybrid inflation

被引:5
作者
Battye, Richard A. [1 ]
Garbrecht, Bjoern [2 ]
Pilaftsis, Apostolos
机构
[1] Univ Manchester, Sch Phys & Astron, Ctr Astrophys, Jodrell Bank, Manchester M13 9PL, Lancs, England
[2] Univ Wisconsin, Dept Phys, Madison, WI 53706 USA
来源
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS | 2008年 / 09期
关键词
CMBR theory; inflation; cosmic strings; domain walls; monopoles;
D O I
10.1088/1475-7516/2008/09/020
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
Global topological defects may account for the large cold spot observed in the cosmic microwave background. We explore possibilities for constructing models of supersymmetric F-term hybrid inflation, where the waterfall fields are globally SU(2)-symmetric. In contrast to the case where SU(2) is gauged, there arise Goldstone bosons and additional moduli, which are lifted only by masses of soft supersymmetry breaking scale. The model predicts the existence of global textures, which can become semi-local strings if the waterfall fields are gauged under U(1) X. Gravitino overproduction can be avoided if reheating proceeds via the light SU(2)-modes or right-handed sneutrinos. For values of the inflaton-waterfall coupling greater than or similar to 10(-4), the symmetry breaking scale imposed by normalization of the power spectrum generated from inflation coincides with the energy scale required to explain the most prominent of the cold spots. In this case, the spectrum of density fluctuations is close to scale invariant, which can be reconciled with measurements of the power spectrum by the inclusion of the sub-dominant component due to the topological defects.
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页数:26
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