arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0712.2178hep-thastro-phgr-qchep-ph
收藏

膜膨胀模型中的熵涨落

Entropy Fluctuations in Brane Inflation Models

Robert H. Brandenberger, Andrew R. Frey, Larissa C. Lorenz

摘要:

我们研究了弯曲喉道中膜暴胀的熵涨落的发展,包括作为瀑布场的膜-反膜快子。我们发现,有一个时期,在暴胀结束时,与快子场的熵模式呈指数增长。反过来,诱导熵种子的贡献曲率波动的宇宙学尺度迅速增长,并可能超过原始曲率扰动。我们确定的参数值,在没有反反应的诱导曲率波动大于原始绝热的。然而,在我们研究的特定模型中,逆反应限制了熵涨落的增长。我们讨论的情况下,反向反应的影响是较少的约束。我们的研究的教训是,在膨胀期结束时熵涨落的发展的研究可以导致膜膨胀模型的约束,并建议曲率机制可能会显着贡献的宇宙学扰动的频谱。

英文摘要:

We study the development of entropy fluctuations in brane inflation in a warped throat, including the brane-antibrane tachyon as the waterfall field. We find that there is a period at the end of inflation during which the entropy mode associated with the tachyon field increases exponentially. In turn, the induced entropy seeds a contribution to the curvature fluctuation on cosmological scales which grows rapidly and could exceed the primordial curvature perturbation. We identify parameter values for which in the absence of back-reaction the induced curvature fluctuations are larger than the primordial adiabatic ones. In the specific model we study, however, back-reaction limits the growth of the entropy fluctuations. We discuss situations in which back-reaction effects are less constraining. The lesson of our investigation is that the study of the development of entropy fluctuations at the end of the period of inflation can lead to constraints on models of brane inflation and suggests that the curvaton mechanism may contribute significantly to the spectrum of cosmological perturbations.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑