Coupling the inflaton to an expanding aether

被引:53
作者
Donnelly, William [1 ]
Jacobson, Ted [1 ]
机构
[1] Univ Maryland, Dept Phys, Ctr Fundamental Phys, College Pk, MD 20742 USA
来源
PHYSICAL REVIEW D | 2010年 / 82卷 / 06期
基金
美国国家科学基金会; 加拿大自然科学与工程研究理事会;
关键词
D O I
10.1103/PhysRevD.82.064032
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We consider a Lorentz-violating theory of inflation consisting of Einstein-aether theory with a scalar inflaton coupled bilinearly to the expansion of the aether. We determine the conditions for linearized stability, positive energy, and vanishing of preferred-frame post-Newtonian parameters, and find that all these conditions can be met. In homogeneous and isotropic cosmology, the inflaton-aether expansion coupling leads to a driving force on the inflaton that is proportional to the Hubble parameter. This force affects the slow-roll dynamics, but still allows for a natural end to inflation.
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页数:12
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