Combined cosmological and solar system constraints on chameleon mechanism

Aurélien Hees, Andre Fuzfa

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The chameleon mechanism appearing in the massive tensor-scalar theory of gravity can effectively reduce locally the nonminimal coupling between the scalar field and matter. This mechanism is invoked to reconcile large-scale departures from general relativity, supposedly accounting for cosmic acceleration, to small-scale stringent constraints on general relativity. In this paper, we carefully investigate this framework on cosmological and solar system scales to derive combined constraints on model parameters, notably by performing a nonambiguous derivation of observables like luminosity distance and local post-Newtonian parameters. The likelihood analysis of type Ia supernovae data and of an admissible domain for the parametrized-post-Newtonian parameters clearly demonstrates that the chameleon mechanism cannot occur in the same region of parameter space as the one necessary to account for cosmic acceleration with the assumed Ratra-Peebles potential and exponential coupling function. © 2012 American Physical Society.
langue originaleAnglais
Pages (de - à)103005
Nombre de pages21
journalPhysical Review D
Numéro de publication10
Date de mise en ligne précoce21 nov. 2011
Les DOIs
Etat de la publicationPublié - 10 mai 2012

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