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Space-time slicing in Horndeski theories and its implications for non-singular bouncing solutions
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In this paper, we show how the proper choice of gauge is critical in analyzing the stability of non-singular cosmological bounce solutions based on Horndeski theories. We show that it is possible to construct non-singular cosmological bounce solutions with classically stable behavior for all modes with wavelengths above the Planck scale where: (a) the solution involves a stage of null-energy condition violation during which gravity is described by a modification of Einstein's general relativity; and (b) the solution reduces to Einstein gravity both before and after the null-energy condition violating stage. Similar considerations apply to galilean genesis scenarios.
Forward citations
Cited by 2 Pith papers
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To bounce or not to bounce in generalized Proca theory and beyond
The authors claim generalized Proca theory cannot produce a stable non-singular bounce, but the proof relies on an incorrect derivative and a flawed sound-speed argument.
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Primordial black hole dark matter from ultra-slow-roll inflation in Horndeski gravity
A kinetic cubic Horndeski coupling creates an ultra-slow-roll phase that amplifies curvature perturbations enough to produce asteroid-mass primordial black holes, potentially 90% of dark matter.
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