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 consistent with the general-relativistic limit.
Nonsingular Rainbow Universes
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abstract
In this work, we study FRW cosmologies in the context of gravity rainbow. We discuss the general conditions for having a nonsingular FRW cosmology in gravity rainbow. We propose that gravity rainbow functions can be fixed using two known modified dispersion relation (MDR), which have been proposed in literature. The first MDR was introduced by Amelino-Camelia, et el. in [9] and the second was introduced by Magueijo and Smolin in [24]. Studying these FRW-like cosmologies, after fixing the gravity rainbow functions, leads to nonsingular solutions which can be expressed in exact forms.
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gr-qc 1years
2026 1verdicts
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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 consistent with the general-relativistic limit.