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Nonsingular Universes in Gauss-Bonnet Gravity's Rainbow
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In this paper, we will study the rainbow deformation of the FRW cosmology in both Einstein gravity and Gauss-Bonnet gravity. We will demonstrate that the singularity in the FRW cosmology can be removed because of the rainbow deformation of the FRW metric. We will obtain the general constraints required for the FRW cosmology to be free from singularities. It will be observed that the inclusion of Gauss-Bonnet gravity can significantly change the constraints required to obtain a nonsingular universes. We will use a rainbow functions motivated from the hard spectra of gamma-ray bursts to deform the FRW cosmology, and it will be explicitly demonstrated that such a deformation removes the singularity in the FRW cosmology.
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Cited by 1 Pith paper
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Rainbow McVittie Horizons in an Expanding Universe
A rainbow-deformed McVittie spacetime with one energy history reduces exactly to standard McVittie dynamics, and a linear late-time rainbow closure fitted to 32 cosmic chronometers and 1580 Pantheon+ supernovae is con...
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