New geometric and field theoretic aspects of the radiation dominated universe.
The homogeneous and isotropic radiation dominated universe, following the inflationary stage, is expressed as a spherically symmetric and inhomogeneous spacetime upon a power law type conformal transformation of the null (cosmological) coordinates. This new metric has a few interesting properties. The symmetry of the metric offers a new unitarily inequivalent quantisation of the massless scalar field and provides a new example of particle creation in curved space. The new set of observers, detecting particles, are freely falling in asymptotic past and future and accelerated in between.
Publisher URL: http://arxiv.org/abs/1802.03833
DOI: arXiv:1802.03833v1
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