p-adic inflation

被引:76
作者
Barnaby, Neil [1 ]
Biswas, Tirthabir [1 ]
Cline, James M. [1 ]
机构
[1] McGill Univ, Dept Phys, Montreal, PQ H3A 2T8, Canada
来源
JOURNAL OF HIGH ENERGY PHYSICS | 2007年 / 04期
关键词
cosmology of theories beyond the SM; tachyon condensation;
D O I
10.1088/1126-6708/2007/04/056
中图分类号
O412 [相对论、场论]; O572.2 [粒子物理学];
学科分类号
摘要
We construct approximate inflationary solutions rolling away from the unstable maximum of p-adic string theory, a nonlocal theory with derivatives of all orders. Novel features include the existence of slow-roll solutions even when the slow-roll parameters, as usually defined, are much greater than unity, as well as the need for the Hubble parameter to exceed the string mass scale m(s). We show that the theory can be compatible with CMB observations if g(s)/root p similar to 10(-7), where g(s) is the string coupling, and if m(s) < 10(-6) M-p. A red-tilted spectrum is predicted, and the scalar-to-tensor ratio is bounded from above as r < 0.006. The p-adic theory is shown to have identical inflationary predictions to a local theory with superPlanckian parameter values, but with the advantage that the p-adic theory is ultraviolet complete.
引用
收藏
页数:35
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