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arxiv: 1810.09997 · v2 · pith:3FOQL4RPnew · submitted 2018-10-23 · 🌀 gr-qc · astro-ph.CO· hep-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
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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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Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.

  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.