Dynamical Dark Energy in Minimally Modified Gravity

Abstract

Minimally modified gravity is a class of models with only the two tensor degrees of freedom as in general relativity. Using the framework with auxiliary constraints these models can maintain a dynamical cosmological background. The form of the constraints is thereby restricted by the requirement of dynamical dark energy and the avoidance of a breakdown of perturbation theory. Studying the linear perturbations around the FLRW background the results are, however, quite insensitive to the details of the constraints leading to a modified effective gravitational constant or a non-vanishing sound speed for dust.

arXiv comment21 pages; accepted version

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Cited by in corpus (2)

• Gravitational wave constraints on spatial covariant gravities
• Testing gravity with the cosmic microwave background: constraints on modified gravity with two tensorial degrees of freedom