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29 March 2024
 
  » arxiv » 1501.7819

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Some Cosmological Consequences of Weyl Invariance
Enrique Álvarez ; Sergio González-Martin ; Mario Herrero-Valea ;
Date 30 Jan 2015
AbstractSome Weyl invariant cosmological models are examined in the framework of dilaton gravity. It will be shown that
When the FRW ansatz for the spacetime metric is assumed, the Ward identity for conformal invariance guarantees that the gravitational equations hold whenever the matter EM do so. It follows that any scale factor can solve the theory provided a non-trivial profile for a dilaton field. In particular, accelerated expansion is a natural solution to the full set of equations.
When two or more scalar fields are coupled to gravity in a Weyl invariant way there is an antigravity phase in which the effective Newton constant is negative. This phase is separated from the atractive gravity phase by a strong coupling barrier. Nevertheles, and perhaps contradicting na"ive beliefs, the antigravity phase does not imply accelerated expansion, although it is compatible with it.
Source arXiv, 1501.7819
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