Absence of Unruh effect in polymer quantization

TL;DR

This paper demonstrates that the Unruh effect, a thermal perception by accelerating observers, vanishes when using polymer or loop quantum gravity quantization methods instead of standard Fock quantization.

Contribution

It shows the absence of Unruh effect in polymer quantization and confirms the vacuum remains a true vacuum for accelerating observers within this framework.

Findings

Unruh effect disappears in polymer quantization.

Polymer vacuum remains a true vacuum for accelerating observers.

Experimental detection could test quantum gravity theories.

Abstract

Unruh effect is a landmark prediction of standard quantum field theory in which Fock vacuum state appears as a thermal state with respect to an uniformly accelerating observer. Given its dependence on trans-Planckian modes, Unruh effect is often considered as an arena for exploring a candidate theory of quantum gravity. Here we show that Unruh effect disappears if, instead of using Fock quantization, one uses polymer quantization or loop quantization, the quantization method used in loop quantum gravity. Secondly, the polymer vacuum state remains a vacuum state even for the accelerating observer in the sense that expectation value of number density operator in it remains zero. Finally, if experimental measurement of Unruh effect is ever possible then it may be used either to verify or rule out a theory of quantum gravity.