Electromagnetic field in an expanding universe

What is it about?

In this study, we investigated the evolution of a universe filled with a massive electromagnetic field. This massive field contributes to the universe's total energy. It might help offer a component that causes the universe to accelerate, so resolving the dark energy problem. Photons acquire mass during the inflationary era then decay, resulting in a nonzero mass today.

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Why is it important?

Photons have no mass and zero trace to energy momentum tensor, according to conventional cosmology. Massive photons provide an interesting addition to the universe's energy.