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The sound of DHOST

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arxiv 1810.09997 v2 pith:3FOQL4RP submitted 2018-10-23 gr-qc astro-ph.COhep-th

The sound of DHOST

Eugeny Babichev , Antoine Leh\'ebel This is my paper
classification gr-qc astro-ph.COhep-th
keywords higher-orderscalar-tensorsoundaffectsatmosphereavoidbackgroundsconstrain
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We show that, in generic higher-order scalar-tensor theories which avoid the Ostrogradsky instability, the presence of a scalar field significantly modifies the propagation of matter perturbations, even in weakly curved backgrounds. This affects notably the speed of sound in the atmosphere of the Earth. It can also generate instabilities in homogeneous media. We use this to constrain the viable higher-order scalar-tensor models.

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Cited by 1 Pith paper

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  1. Neutron stars with primary scalar hair

    gr-qc 2026-07 unverdicted novelty 4.0

    Neutron stars with primary scalar hair in a DHOST subfamily are more compact than GR predictions and develop singularities above a critical scalar charge threshold.