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2019

Cuscuton gravity as a classically stable limiting curvature theory

Quintin, Jerome, Yoshida, Daisuke

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Finding effective theories of modified gravity that can resolve cosmological singularities and avoid other physical pathologies such as ghost and gradient instabilities has turned out to be a rather difficult task.

The concept of limiting curvature, where one bounds a finite number of curvature-invariant functions thanks to constraint equations, is a promising avenue in that direction, but its implementation has only led to mixed results.
Cuscuton gravity, which can be defined as a special subclass of $k$-essence theory for instance, is a minimal modification of gravity since it does not introduce any new degrees of freedom on a cosmological background.
Importantly, it naturally incorporates the idea of limiting curvature.

Cuscuton gravity as a classically stable limiting curvature theory · Around

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