On stability of Friedmann-Lemaître-Robertson-Walker solutions in doubled geometries
arXiv:2012.06401 · doi:10.1103/PhysRevD.103.044041
Abstract
Motivated by the models of geometry with discrete spaces as additional dimensions we investigate the stability of cosmological solutions in models with two metrics of the Friedmann-Lemaître-Robertson-Walker type. We propose an effective gravity action that couples the two metrics in a similar manner as in the bimetric theory of gravity and analyse whether standard solutions with identical metrics are stable under small perturbations.
arXiv comment20 pages
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