标题： 独立宇宙与长波长涨落的反作用 显示英文标题

标题： The separate universe and the back reaction of long wavelength fluctuations

摘要： 我们研究了宇宙学长波长扰动对宇宙演化的影响。 通过将重正化群方法应用于具有长波长涨落的弗里德曼-罗伯逊-沃克宇宙，我们证明了包含反作用效应的重正化解与单独宇宙的解等价。 然后，利用有效的弗里德曼方程，我们表明只有非绝热模式的长波长涨落影响空间平均宇宙的膨胀规律。 显示英文摘要

摘要： We investigate the backreaction of cosmological long wavelength perturbations on the evolution of the Universe. By applying the renormalization group method to a Friedmann-Robertson-Walker universe with long wavelength fluctuations, we demonstrate that the renormalized solution with the backreaction effect is equivalent to that of the separate universe. Then, using the effective Friedmann equation, we show that only non-adiabatic mode of long wavelength fluctuations affects the expansion law of the spatially averaged universe.