Symmetry, Gravitation and Cosmology

Dear Colleagues,

In this Special Issue of Symmetry we want to present research articles and review articles on fundamental cosmological topics covering classical cosmology, quantum cosmology, as well as confrontations of theoretical models with observations.

The most simple universe models are homogeneous and isotropic, presumably reflecting properties of our universe on a scale larger than a billion light years. Never the less there has appeared signs in the Planck observations of the temperature fluctuations of the cosmic microwave background radiation that there may exist a cosmic anisotropy even on the largest scales. Possibly, one of the anisotropic Bianchi-type universe models, may represent the properties of the universe in a more realistic way than the isotropic and homogeneous universe.

There have also been efforts to “explain away” the large scale dark energy by considering inhomogeneous universe models. At the present time, those models are not favored by observations, but better models may be constructed.

We also invite researchers to contribute with new research on the early inflationary era. Warm inflation is more realistic than cold including the possibility of a transition from dark energy to radiation, which is not considered in the usual cold inflationary universe models. In addition, warm inflation seems to come better out of the confrontation with observations than cold inflation.

Furthermore it would be ideal to present contributions shedding light on how in the inflationary era started.

Prof. Øyvind Grøn
Guest Editor

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