Quadrupole anisotropy from photon quantum effects
arXiv:gr-qc/9511044 · doi:10.1007/BF02105426
Abstract
We consider quantum effects of an electromagnetic field in a radiation-dominated almost FRW spacetime. The dominant non-local quantum correction to the photon distribution is a quadrupole moment, corresponding to an effective anisotropic pressure in the energy-momentum tensor.
11 pages LaTeX, no figures; to appear in General Relativity and Gravitation