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Derivative chameleons

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If you have a question about this talk, please contact Camille Bonvin.

With now Nobel-prize-winning observational evidence for the accelerated expansion of the Universe, we are still in search of a thorough theoretical understanding of its cause. One strong candidate in this enterprise are chameleon theories, where a new scalar degree of freedom modifies GR on cosmological scales, but is screened away in dense environments so as to comply with tight fifth force constraints. In this talk I will introduce and discuss generalized chameleon models where the conformal coupling between matter and gravitational geometries is not only a function of the chameleon field phi, but also of its derivatives via higher order co-ordinate invariants.

This talk is part of the Cosmology Lunch series.

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