Departamento de Física Teórica y del Cosmos, Universidad de Granada, Granada 18071, Spain.
Phys Rev Lett. 2010 Aug 20;105(8):081301. doi: 10.1103/PhysRevLett.105.081301.
We present the evolution of the full set of Einstein equations during preheating after inflation. We study a generic supersymmetric model of hybrid inflation, integrating fields and metric fluctuations in a 3-dimensional lattice. We take initial conditions consistent with Einstein's constraint equations. The induced preheating of the metric fluctuations is not large enough to backreact onto the fields, but preheating of the scalar modes does affect the evolution of vector and tensor modes. In particular, they do enhance the induced stochastic background of gravitational waves during preheating, giving an energy density in general an order of magnitude larger than that obtained by evolving the tensor fluctuations in an homogeneous background metric. This enhancement can improve the expectations for detection by planned gravitational wave observatories.
我们展示了在通货膨胀后预热期间整套爱因斯坦方程的演化。我们研究了一个通用的混合通货膨胀的超对称模型，在一个 3 维晶格中整合了场和度规涨落。我们采用了与爱因斯坦约束方程一致的初始条件。所引起的度规涨落的预热不足以对场产生反作用，但标量模式的预热确实会影响矢量和张量模式的演化。特别是，它们确实增强了预热期间引力波的随机背景，其能量密度通常比在均匀背景度规中演化张量涨落所得到的能量密度大一个数量级。这种增强可以提高计划中的引力波观测站的探测预期。
