Dark energy and modified gravity in degenerate higher-order scalar–tensor (DHOST) theories: A review
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Publication:5242595
DOI10.1142/S0218271819420069zbMATH Open1423.83004arXiv1811.06271MaRDI QIDQ5242595
Author name not available (Why is that?)
Publication date: 12 November 2019
Published in: (Search for Journal in Brave)
Abstract: This article reviews scalar-tensor theories characterized by a Lagrangian that, despite the presence of second order derivatives, contain a single scalar degree of freedom. These theories, known as Degenerate Higher-Order Scalar-Tensor (DHOST) theories, include Horndeski and Beyond Horndeski theories. They propagate a single scalar mode as a consequence of the degeneracy of their Lagrangian and, therefore, are not plagued by an Ostrodradsky instability. They have been fully classified up to cubic order in second-order derivatives. The study of their phenomenological consequences restricts the subclass of DHOST theories that are compatible with observations. In cosmology, these theories can be described in the language of the unified effective approach to dark energy and modified gravity. Compact objects in the context of DHOST theories are also discussed.
Full work available at URL: https://arxiv.org/abs/1811.06271
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