On a quadratic equation of state and a universe mildly bouncing above the Planck temperature
Joanna Berteaud, Johanna Pasquet, Thomas Sch\"ucker, Andr\'e, Tilquin
TL;DR
This paper explores a universe model with a quadratic equation of state that avoids initial singularity, fitting observational data as well as LambdaCDM, and features a mild bounce at super-Planckian temperatures.
Contribution
It introduces a one-parameter quadratic equation of state model that matches observational data and proposes a non-singular universe with a mild bounce above the Planck temperature.
Findings
Fits supernova and BAO data as well as LambdaCDM
Universe exhibits a mild bounce, avoiding initial singularity
Bounce occurs at temperatures above the Planck scale
Abstract
A 1-parameter class of quadratic equations of state is confronted with the Hubble diagram of supernovae and Baryonic Acoustic Oscillations. The fit is found to be as good as the one using the LambdaCDM model. The corresponding universe has no initial singularity, only a mild bounce at a temperature well above the Planck temperature.
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