论文标题
旋转和纵向扩展的$ ϕ^4 $标量系统的各向同性化
Isotropization of a rotating and longitudinally expanding $ϕ^4$ scalar system
论文作者
论文摘要
我们提供了数值模拟，以通过四分之一耦合的无质量标量场的扩展系统演变。通过设置旋转的非各向异性初始配置，我们计算系统的能量密度，横向压力和纵向压力以及系统的角动量。我们比较与各向同性化和由于膨胀引起的初始角动量的衰减相关的时间尺度，并表明即使对于相当大的初始角动量，它的衰减速度也明显快于压力各向异性。
We present numerical simulations for the evolution of an expanding system of massless scalar fields with quartic coupling. By setting a rotating, non-isotropic initial configuration, we compute the energy density, the transverse and longitudinal pressures and the angular momentum of the system. We compare the time scales associated with the isotropization and the decay of the initial angular momentum due to the expansion, and show that even for fairly large initial angular momentum, it decays significantly faster than the pressure anisotropy.
