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On singularity-resolution in mimetic gravity
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DOI：10.1016/j.physletb.2018.05.039.png)
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Abstract
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Recently, it was shown that modified mimetic gravity, with a f(square phi) term, results in a singularity-free model of gravity, for both cosmological and black hole spacetimes [1,2]. In this work, we analyze this model further and show that, since the function f was tuned to vanish rapidly for small values of the argument, the non-singular bounce relies heavily on a subtle branch changing mechanism for the multi-valued function f. Furthermore, this mechanism has interesting implications for the proposed link between this model and loop quantum cosmology. (c) 2018 The Authors. Published by Elsevier B.V.
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