标题： 规范不变度规涨落在暴胀期间的退相干 显示英文标题

标题： Decoherence of gauge-invariant metric fluctuations during inflation

摘要： 我研究宇宙暴胀期间度规的规范不变扰动。 在红外区域，度规扰动可以用一个粗粒化场来表示。 我们可以为粗粒化度规扰动写出一个薛定谔方程，该方程与一个随时间变化的质量谐振子的有效哈密顿量有关，并且有一个随机外部力。 我研究幂律膨胀宇宙的波函数。 我发现，在暴胀结束时，超哈勃标量度规扰动的量子态的相空间失去了其相干性。 这种效应是由于超哈勃度规扰动与其共轭变量之间的干涉造成的，这种共轭变量是由粗粒化标量度规扰动与环境的相互作用产生的。 显示英文摘要

摘要： I study the gauge-invariant fluctuations of the metric during inflation. In the infrared sector the metric fluctuations can be represented by a coarse-grained field. We can write a Schroedinger equation for the coarse-grained metric fluctuations which is related to an effective Hamiltonian for a time dependent parameter of mass harmonic oscillator with a stochastic external force. I study the wave function for a power-law expanding universe. I find that the phase space of the quantum state for super Hubble scalar metric perturbations loses its coherence at the end of inflation. This effect is a consequence of interference between the super Hubble metric perturbations and its canonical conjugate variable, which is produced by the interaction of the coarse-grained scalar metric fluctuation with the environment.