Stable, non-singular bouncing universe with only a scalar mode
arXiv:2005.01762 · doi:10.1103/PhysRevD.102.024080
Abstract
In this paper, we study a class of higher derivative, non-local gravity which admits homogeneous and isotropic non-singular, bouncing universes in the absence of matter. At the linearized level, the theory propagates only a scalar degree of freedom, and no vector or tensor modes. The scalar can be made free from perturbative ghost instabilities, and has oscillatory and bounded evolution across the bounce.
5 pages, 1 figure
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