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Collapsing universe before time
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DOI：10.1088/1475-7516/2024/05/124.png)
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In this note, we prove analytic bounds on the equation of state of a cosmological fluid composed of an arbitrary number of canonical scalars evolving in a negative multiexponential potential. Because of the negative energy, the universe is contracting and eventually undergoes a big crunch. A contracting universe is a fundamental feature of models of ekpyrosis and cyclic universes, which are a proposed alternative to cosmic inflation to solve the flatness and horizon problems. Our analytic bounds set quantitative constraints on general effective theories of ekpyrosis. When applied to specific top -down constructions, our bounds can be used to determine whether ekpyrosis could in principle be realized. We point out some possible sources of tension in realizing the ekpyrotic universe in controlled constructions of string theory.
Keyword:
alternatives to inflation
initial conditions and eternal universe
physics of the early universe
string theory and cosmology
期刊
IF:
5.9
论文数:
1.3W
被引数:
4.7W
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