Quadrupole anisotropy from photon quantum effects
Alexei V Nesteruk, Roy Maartens
TL;DR
This paper investigates how quantum effects of electromagnetic fields in a radiation-dominated universe induce a quadrupole anisotropy, affecting the energy-momentum tensor.
Contribution
It introduces the concept that quantum corrections lead to a quadrupole anisotropy in photon distribution within an almost FRW spacetime.
Findings
Quantum effects generate a quadrupole moment in photon distribution.
The quadrupole moment acts as an effective anisotropic pressure.
Quantum corrections influence the energy-momentum tensor in early universe models.
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.
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