Emergent universe and Genesis from the DHOST cosmology
Open Access
- 22 January 2021
- journal article
- research article
- Published by Springer Nature in Journal of High Energy Physics
- Vol. 2021 (1) , 1-22
Abstract
In this article, we present an emergent universe scenario that can be derived from DHOST cosmology. The universe starts asymptotically Minkowski in the far past just like the regular Galileon Genesis, but evolves to a radiation dominated period at the late stage, and therefore, the universe has a graceful exit which is absent in the regular Galileon Genesis. We analyze the behavior of cosmological perturbations and show that both the scalar and tensor modes are free from the gradient instability problem. We further analyze the primordial scalar spectrum generated in various situations and discuss whether a scale invariance can be achieved.Keywords
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This publication has 71 references indexed in Scilit:
- DBI realizations of the pseudo-conformal universe and Galilean Genesis scenariosJournal of Cosmology and Astroparticle Physics, 2012
- ALTERNATIVES TO THE INFLATIONARY PARADIGM OF STRUCTURE FORMATIONInternational Journal of Modern Physics: Conference Series, 2011
- String Gas Cosmology2009
- k-Essence, superluminal propagation, causality and emergent geometryJournal of High Energy Physics, 2008
- Causality, analyticity and an IR obstruction to UV completionJournal of High Energy Physics, 2006
- On the new string theory inspired mechanism of generation of cosmological perturbationsJournal of Cosmology and Astroparticle Physics, 2006
- The emergent universe: an explicit constructionClassical and Quantum Gravity, 2003
- The emergent universe: inflationary cosmology with no singularityClassical and Quantum Gravity, 2003
- Nearly scale-invariant spectrum of adiabatic fluctuations may be from a very slowly expanding phase of the UniversePhysical Review D, 2003
- Gauge-invariant joining conditions for cosmological perturbationsThe Astrophysical Journal, 1991