论文标题
产后结构形成的随机重力波
Stochastic Gravitational Waves from Post-inflationary Structure Formation
论文作者
论文摘要
通货膨胀后，宇宙可能会通过振荡的充气凝结物支持的早期物质主导阶段。最初，冷凝水中的微小波动在亚剖分尺度上重力生长，并且可以崩溃以形成非线性``Aftraton Halos''。它们的形成和随后的潮汐相互作用将产生重力波，从而导致当前宇宙的随机背景。我们扩展了N体模拟，以模拟折叠结构的生长和相互作用，以计算所得的重力波发射。基于Aftraton Halos的崩溃及其潮汐演化，该辐射的光谱通过半分析估计值很好地匹配。我们使用这种半分析的形式主义来推断场景的频谱，在这种情况下，早期占物质主导的阶段在低至$ 100 \ $ 100 \，\ mathrm {Mev} $的温度下使宇宙的范围，我们讨论了这种信号在通货膨胀模型中产生的可能的实验机会，在通货膨胀发生后很长一段时间就完成了通货膨胀。
Following inflation, the Universe may pass through an early matter-dominated phase supported by the oscillating inflaton condensate. Initially small fluctuations in the condensate grow gravitationally on subhorizon scales and can collapse to form nonlinear ``inflaton halos''. Their formation and subsequent tidal interactions will source gravitational waves, resulting in a stochastic background in the present Universe. We extend N-body simulations that model the growth and interaction of collapsed structures to compute the resulting gravitational wave emission. The spectrum of this radiation is well-matched by semi-analytical estimates based on the collapse of inflaton halos and their tidal evolution. We use this semi-analytic formalism to infer the spectrum for scenarios where the early matter-dominated phase gives way to a thermalized universe at temperatures as low as $100\,\mathrm{MeV}$ and we discuss the possible experimental opportunities created by this signal in inflationary models in which thermalization takes place long after inflation has completed.
