1-5 July 2019
Faculty of Physics, University of Warsaw
Europe/Warsaw timezone

The sound of DHOST

Not scheduled
20m
Faculty of Physics, University of Warsaw

Faculty of Physics, University of Warsaw

conference hall 0.03, Faculty of Physics, University of Warsaw ul. Pasteura 5, 02-093 Warszawa Poland
Poster session

Speakers

Dr Antoine Lehébel (University of Nottingham) Dr Eugeny Babichev (Laboratoire de Physique Théorique)

Description

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. I will use this to constrain the viable higher-order scalar-tensor models.

Primary authors

Dr Antoine Lehébel (University of Nottingham) Dr Eugeny Babichev (Laboratoire de Physique Théorique)

Presentation Materials

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