.png){kind=icon}
.png){kind=icon}
Return
The electromagnetic dark sector
.png){kind=icon}
OA
AI
DOI：10.1016/j.physletb.2010.02.038.png)
.png){kind=icon}
.png){kind=icon}
Share.png){kind=icon}
Save
Abstract
En 中文
We consider electromagnetic field quantization in an expanding universe We find that the covariant (Gupta-Bleuler) method exhibits certain difficulties when trying to impose the quantum Lorenz condition on cosmological scales. We thus explore the possibility of consistently quantizing without imposing such a condition In this case there are three physical stares, which are the two transverse polarizations of the massless photon and a new massless scalar mode coming from the temporal and longitudinal components of the electromagnetic field An explicit example in de Sitter space-time shows that it is still possible to eliminate the negative norm state and to ensure the positivity of the energy in this theory The new state is decoupled from the conserved electromagnetic currents. but is non-conformally coupled to gravity and therefore can be excited from vacuum fluctuations by the expanding background The cosmological evolution ensures that the new state modifies Maxwell's equations in a totally negligible way on sub-Hubble scales. However, on cosmological scales it can give rise to a non-negligible energy density which could explain in a natural way the present phase of accelerated expansion of the universe (C) 2010 Elsevier B V All rights reserved
Keywords:
Quantum fields in curved space-time
Dark energy
AI Summary
Key information extracted from the uploaded paper, including a brief overview, abstract, background, key highlights, visual analysis, and future outlook.
Journal
IF:
4.5
Papers:
3.2W
Citations:
7.3W