EPJ Web Conf.
Volume 191, 2018XXth International Seminar on High Energy Physics (QUARKS-2018)
|Number of page(s)||9|
|Section||Gravity and its Modifications|
|Published online||31 October 2018|
Cosmological bounce in Horndeski theory and beyond
Institute for Nuclear Research of the Russian Academy of Sciences, 60th October Anniversary Prospect, 7a, 117312 Moscow, Russia
2 Department of Particle Physics and Cosmology, Physics Faculty, M.V. Lomonosov Moscow State University, Vorobjevy Gory, 119991 Moscow, Russia
3 Institute for Theoretical and Experimental Physics, Bolshaya Cheriomyshkinskaya, 25, 117218 Moscow, Russia
4 Department of Physics, Princeton University, Princeton, New Jersey 08544, USA
* e-mail: email@example.com 1Recently beyond Horndeski theories were generalized to the so called DHOST theories (see e.g. Ref. ).
Published online: 31 October 2018
We discuss the stability of the classical bouncing solutions in the general Horndeski theory and beyond Horndeski theory. We restate the no-go theorem, showing that in the general Horndeski theory there are no spatially flat non-singular cosmological solutions which are stable during entire evolution. We show the way to evade the no-go in beyond Horndeski theory and give two specific examples of bouncing solutions, whose asymptotic past and future or both are described by General Relativity (GR) with a conventional massless scalar field. Both solutions are free of any pathologies at all times.
© The Authors, published by EDP Sciences, 2018
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