arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2008.03331gr-qchep-th
收藏

噪声在早期宇宙中的作用

The role of noise in the early universe

Ezequiel Lozano, Francisco D. Mazzitelli

AI总结:

本文通过量子力学模型研究噪声对早期宇宙演化的影响,指出真空能量密度涨落可能导致振荡而非指数膨胀的宇宙,强调噪声在尺度因子演化中的关键作用。

摘要:

我们考虑一个量子力学系统来模拟量子场对早期宇宙演化的影响。该系统由一个与一组谐振子双线性耦合的反向振子组成。我们指出,噪声的作用在振子的动力学中可能至关重要,该动力学利用随机频率谐振子理论进行分析。基于这一类比,我们认为,由于围绕其平均值的涨落,正的真空能量密度不会产生指数膨胀的宇宙,而是产生一个振荡的宇宙,其方式与倒立摆通过悬挂点的随机振荡而稳定(随机卡皮查摆)相同。结果强调了噪声在尺度因子演化中的相关性。

英文摘要:

We consider a quantum mechanical system to model the effect of quantum fields on the evolution of the early universe. The system consists of an inverted oscillator bilinearly coupled to a set of harmonic oscillators. We point out that the role of noise may be crucial in the dynamics of the oscillator, which is analyzed using the theory of harmonic oscillators with random frequency. Using this analogy we argue that, due to the fluctuations around its mean value, a positive vacuum energy density would not produce an exponentially expanding but an oscillating universe, in the same fashion that an inverted pendulum is stabilized by random oscillations of the suspension point (stochastic Kapitza pendulum). The results emphasize the relevance of noise in the evolution of the scale factor.

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。

↑