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Article overview
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Some Cosmological Consequences of Weyl Invariance | Enrique Álvarez
; Sergio González-Martin
; Mario Herrero-Valea
; | Date: |
30 Jan 2015 | Abstract: | Some 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 | Services: | Forum | Review | PDF | Favorites |
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