Robustness of inflation to large tensor perturbations

被引：41
作者：
Clough, Katy [1 ]
Flauger, Raphael [2 ]
Lim, Eugene A. [3 ]
机构：
[1] Georg August Univ, Inst Astrophys, Friedrich Hund Pl 1, D-37077 Gottingen, Germany
[2] Univ Calif San Diego, Ctr Astrophys & Space Sci, 9500 Gilman Dr 0319, La Jolla, CA 92093 USA
[3] Kings Coll London, Phys Dept, Theoret Particle Phys & Cosmol Grp, London WC2R 2LS, England
来源：
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS | 2018年 / 05期
关键词：
inflation; initial conditions and eternal universe; gravity; COSMIC NO-HAIR; INITIAL CONDITIONS; INHOMOGENEOUS COSMOLOGIES; CHAOTIC INFLATION; EVOLUTION; UNIVERSE; STABILITY; ATTRACTOR; FLATNESS; HORIZON;
D O I：
10.1088/1475-7516/2018/05/065
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
Extending our previous work on the robustness of inflation to perturbations in the scalar field, we investigate the effects of perturbations in the transverse traceless part of the extrinsic curvature on the evolution of an inhomogeneous inflaton field. Focusing on small field models, we show that these additional metric inhomogeneities initially reduce the total number of e-folds as the amplitude increases, but that the reduction saturates and even reverses above a certain amplitude. We present an argument that this is due to the presence of a large initial Hubble friction when metric perturbations are large.
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页数：29
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