论文标题
标量场的二阶能量量张量
Second-order energy-momentum tensor of a scalar field
论文作者
论文摘要
我们研究了由线性标量宇宙学扰动的二次术语构建的二阶有效能量张量（2EMT），而宇宙则由标量场主导。我们表明2EMT是量规依赖性的。然后，我们在缓慢的通货膨胀阶段在三个（纵向，空间平坦和共同的量规条件）中研究2EMT。我们发现，在所有这些量规条件下，2EMT在超级马尺度上表现出W = -1/3的有效流体。
We investigate the second-order effective energy-momentum tensor (2EMT) constructed by the quadratic terms of the linear scalar cosmological perturbations while the universe is dominated by a scalar field. We show that 2EMT is gauge dependent. We then study 2EMT in three (longitudinal, spatially flat, and comoving) gauge conditions in the slow-roll stage of inflation. We find that 2EMT exhibits an effective fluid of w=-1/3 on super-horizon scales in all of those gauge conditions.
