Journal
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
Volume -, Issue 3, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1475-7516/2018/03/020
Keywords
alternatives to inflation; initial conditions and eternal universe; physics of the early universe; cosmic singularity
Funding
- Undergraduate Research grant by the Natural Sciences and Engineering Research Council of Canada
- Billy Jones scholarship - Department of Physics at Simon Fraser University
- Perimeter Institute for Theoretical Physics
- Government of Canada through the Department of Innovation, Science and Economic Development Canada
- European Regional Development Fund
- Czech Ministry of Education, Youth and Sports (MSMT): Project CoGraDS [CZ.02.1.01/0.0/0.0/15003/0000437]
- J.E. Purkyne Fellowship of the Czech Academy of Sciences
- Natural Sciences and Engineering Research Council of Canada
- Undergraduate Research grant by the Natural Sciences and Engineering Research Council of Canada
- Billy Jones scholarship - Department of Physics at Simon Fraser University
- Perimeter Institute for Theoretical Physics
- Government of Canada through the Department of Innovation, Science and Economic Development Canada
- European Regional Development Fund
- Czech Ministry of Education, Youth and Sports (MSMT): Project CoGraDS [CZ.02.1.01/0.0/0.0/15003/0000437]
- J.E. Purkyne Fellowship of the Czech Academy of Sciences
- Natural Sciences and Engineering Research Council of Canada
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We study a particular realization of the cosmological bounce scenario proposed recently by Ijjas and Steinhardt in [1]. First, we find that their bouncing solution starts from a divergent sound speed and ends with its vanishing. Thus, the solution connects two strongly coupled configurations. These pathologies are separated from the bouncing regime by only a few Planck times. We then reveal the exact structure of the Lagrangian, which reproduces this bouncing solution. This reconstruction allowed us to consider other cosmological solutions of the theory and analyze the phase space. In particular, we find other bouncing solutions and solutions with superluminal sound speed. These stable superluminal states can be continuously transformed into the solution constructed by Ijjas and Steinhardt. We discuss the consequences of this feature for a possible UV-completion.
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