Quadrupole anisotropy from photon quantum effects
classification
🌀 gr-qc
keywords
quantumeffectsphotonquadrupolealmostanisotropicanisotropyconsider
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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.
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