Gravitational constant in multiple field gravity

Abstract

In the present study, we consider general form of the Lagrangian $f(R,{\varphi }^I,X)$, that is a function of the Ricci scalar, multiple scalar fields and non-canonical kinetic terms. We obtain the effective Newton's constant deep inside the Hubble radius. We use Jordan and Einstein frames, and study the conservation of energy-momentum tensor.

13 pages,no fig., JCAP style

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• Preheating after multifield inflation with nonminimal couplings, III: Dynamical spacetime results
• Conformal transformations in modified teleparallel theories of gravity revisited
• Preheating after multifield inflation with nonminimal couplings, II: Resonance Structure
• Effective gravitational coupling in modified teleparallel theories
• Time-Scales for Nonlinear Processes in Preheating after Multifield Inflation with Nonminimal Couplings
• Post-Newtonian parameter $\gamma$ for multiscalar-tensor gravity with a general potential
• Hubble multi-scalar inflation
• Natural Inflation with Exponentially Small Tensor-To-Scalar Ratio
• Exact inflationary solutions in exponential gravity