论文标题
高温下标量磁场
Scalar field damping at high temperatures
论文作者
论文摘要
与热等离子体相互作用的标量场的运动（如加热过程中的充气）被抑制，这是一个耗散过程。在高温下，可以在有效运动方程式中通过局部项来描述阻尼。阻尼系数对多个散射敏感。在循环扩展中，其计算将需要全阶重新调整。取而代之的是，我们解决了一个有效的玻尔兹曼方程，类似于运输系数的计算。对于与另一个标量场的相互作用，我们获得了阻尼系数和大量粘度之间的简单关系，因此可以利用后者的已知结果。阻尼系数的数值预取子对象被证明很大，订单为$ 10 ^ 4 $。
The motion of a scalar field that interacts with a hot plasma, like the inflaton during reheating, is damped, which is a dissipative process. At high temperatures the damping can be described by a local term in the effective equation of motion. The damping coefficient is sensitive to multiple scattering. In the loop expansion its computation would require an all-order resummation. Instead we solve an effective Boltzmann equation, similarly to the computation of transport coefficients. For an interaction with another scalar field we obtain a simple relation between the damping coefficient and the bulk viscosity, so that one can make use of known results for the latter. The numerical prefactor of the damping coefficient turns out to be rather large, of order $ 10 ^ 4 $.
