Infrared propagator corrections for constant deceleration
Infrared propagator corrections for constant deceleration
复制标题
红外传播器修正恒定减速度
DOI：
10.1088/0264-9381/25/24/245013
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发表时间：
2008
影响因子：
3.5
通讯作者：
R. Woodard
中科院分区：
文献类型：
--
作者：
T. Janssen;S. Miao;T. Prokopec;R. Woodard
我们推导出一个无质量，最小耦合标量传播的D维，空间平坦，均匀和各向同性的背景与任意常数减速参数。我们的构造使用算子形式主义，通过积分傅立叶模式和。我们给予特别注意，红外校正从非零下限与有限的空间部分工作。这些校正消除了红外发散，否则将被不正确地处理的尺寸正则化，导致在不符合发散的减速参数的那些特殊值，在红外发散是对数。作为应用，我们计算了标量应力-能量张量的期望值。
We derive the propagator for a massless, minimally coupled scalar on a D-dimensional, spatially flat, homogeneous and isotropic background with arbitrary constant deceleration parameter. Our construction uses the operator formalism by integrating the Fourier mode sum. We give special attention to infrared corrections from the nonzero lower limit associated with working on finite spatial sections. These corrections eliminate infrared divergences that would otherwise be incorrectly treated by dimensional regularization, resulting in off-coincidence divergences for those special values of the deceleration parameter at which the infrared divergence is logarithmic. As an application we compute the expectation value of the scalar stress–energy tensor.