arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 0912.5148astro-ph.CO
收藏

暴胀的量子阶段

The Quantum Phase of Inflation

Arjun Berera, Raghavan Rangarajan

摘要:

暴胀模型可以具有暴胀的早期阶段,其中暴胀子的演化在进入由标量场势的斜率驱动的阶段之前由量子涨落驱动。对于科尔曼-温伯格势,这个量子相位持续10^{7-8}个e折叠。暴胀场的长周期涨落驱动的增长可能会使暴胀子超过我们当前视界尺度穿过视界的场的值;或者,即使场不穿过phi_*,暴胀子在这个阶段结束时也可能具有高动能。因此,我们在不同的通货膨胀模型的背景下研究这些问题。在宇宙学相关尺度在量子阶段离开的情况下,我们得到O(10)的大曲率扰动。我们也将我们的结果应用到二次曲率模型和quintessence模型。在曲率模型中,我们发现暴胀必须比解决视界问题所需的持续时间更长,曲率模型与小场暴胀模型不兼容,并且可能存在太大的非高斯性。提出了一个新的热涨落驱动暴胀相,在暴胀过程中,暴胀子的演化由持续的热辐射浴的涨落控制,而不是由标量场势控制.

英文摘要:

Inflation models can have an early phase of inflation where the evolution of the inflaton is driven by quantum fluctuations before entering the phase driven by the slope of the scalar field potential. For a Coleman-Weinberg potential this quantum phase lasts 10^{7-8} e-foldings. A long period of fluctuation driven growth of the inflation field can possibly take the inflaton past phi_*, the value of the field where our current horizon scale crosses the horizon; alternatively, even if the field does not cross phi_*, the inflaton could have high kinetic energy at the end of this phase. Therefore we study these issues in the context of different models of inflation. In scenarios where cosmological relevant scales leave during the quantum phase we obtain large curvature perturbations of O(10). We also apply our results to quadratic curvaton models and to quintessence models. In curvaton models we find that inflation must last longer than required to solve the horizon problem, that the curvaton models are incompatible with small field inflation models and that there may be too large non-gaussianity. A new phase of thermal fluctuation driven inflation is proposed, in which during inflation the inflaton evolution is governed by fluctuations from a sustained thermal radiation bath rather than by a scalar field potential.

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。

↑