Vacuum Phase Transitions and the Temperature of the Universe

TL;DR

This paper explores how first-order vacuum phase transitions could explain the current high value of the product of the universe's curvature radius and temperature, with implications for GUT models.

Contribution

It proposes a mechanism where vacuum phase transitions naturally increase aT from unity to very large values in Coleman-Weinberg models.

Findings

Vacuum phase transitions can generate large aT values.

Coleman-Weinberg models support natural first-order transitions.

Implications for GUT theories are discussed.

Abstract

The authors discuss a possibility that the present great value of aT ( a is the radius of spatial curvature and T is the temperature of the Universe ) was generated by first order vacuum phase transitions. In Coleman-Weinberg type models such transitions are natural and they rise the value of aT from unity to an exponentially large value. Some GUTs are briefly discussed in this contest.