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Modified Gravity and the Radiation Dominated Epoch · Around

2012

Modified Gravity and the Radiation Dominated Epoch

van de Bruck, C., Sculthorpe, G.

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In this paper we consider scalar-tensor theories, allowing for both conformal and disformal couplings to a fluid with a generic equation of state.

We derive the effective coupling for both background cosmology and for perturbations in that fluid.
As an application we consider the scalar degree of freedom to be coupled to baryons and study the dynamics of the tightly coupled photon-baryon fluid in the early universe.
We derive an expression for the effective speed of sound, which differs from its value in General Relativity.

Built on

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S. Dodelson, Modern Cosmology
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Then

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J. Noller, JCAP 1207
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