Lee-Wick radiation induced bouncing universe models

TL;DR

This paper explores how Lee-Wick partner-infested radiation phases can induce a bouncing universe, analyzing conditions for a bounce and implications for particle masses and power spectra.

Contribution

It introduces mechanisms by which Lee-Wick radiation can cause a cosmological bounce, including the need for dark matter or fine-tuned thermalization conditions.

Findings

A bounce requires either cold dark matter or fine-tuned thermalization.

The model predicts a blue-tilted power spectrum of metric perturbations.

Lower mass limits for Lee-Wick partners depend on bounce temperature.

Abstract

The present article discusses about the effect of a Lee-Wick partner infested radiation phase of the early universe. As Lee-Wick partners can contribute negative energy density so it is always possible that at some early phase of the universe when the Lee-Wick partners were thermalized the total energy density of the universe became very small making the effective Hubble radius very big. This possibility gives rise to the probability of a bouncing universe. As will be shown in the article that a simple Lee-Wick radiation is not enough to produce a bounce. There can be two possibilities which can produce a bounce in the Lee-Wick radiation phase. One requires a cold dark matter candidate to trigger the bounce and the other possibility requires the bouncing temperature to be fine tuned such as all the Lee-Wick partners of the standard fields are not thermalized at the bounce temperature. Both the possibilities give rise to blue-tilted power spectrum of metric perturbations. Moreover the bouncing universe model can predict the lower limit of the masses of the Lee-Wick partners of chiral fermions and massless gauge bosons. The mass limit intrinsically depends upon the bounce temperature.