Big bounce as scattering of wave function at big crunch

TL;DR

This paper presents a gauge-invariant quantum model of the FRW universe that replaces the classical big bang singularity with a quantum bounce, showing wave reflection and transmission at the classical singularity.

Contribution

It introduces a reduced phase space quantization approach for the FRW universe, demonstrating a big bounce replacing the classical singularity through wave scattering analysis.

Findings

Wave function reflects at the classical singularity with 1/4 rate.

Wave function transmits through the singularity with 3/4 rate.

Classical singularity is replaced by a quantum big bounce.

Abstract

A gauge-invariant quantum theory of the Friedmann-Robertson-Walker (FRW) universe with dust is studied in terms of the Ashtekar variables. We use the reduced phase space quantization which has following advantages: (i) fundamental variables are all gauge invariant, (ii) there exists a physical time evolution of gauge-invariant quantities, so that the problem of time is absent and (iii) the reduced phase space can be quantized in the same manner as in ordinary quantum mechanics. In the FRW model, the dynamical components of the Ashtekar variables are given by a single quantity $p$ and its conjugate momentum, where $p$ is related to the scale factor $a$ as $a\propto \sqrt{|p|}$ and its sign gives the orientation of triads. We solve a scattering problem in terms of ingoing and outgoing energy eigenstates. We show that the incident wave is reflected in rate $1/4$ and transmitted in rate $3/4$ at the classical singularity $p=0$. Analyzing the dynamics of a wave packet, we show that the classical initial singularity is replaced by a big bounce in quantum theory. A possible interpretation of the result is that the wave function of the universe has been in a superposition of states representing right-handed and left-handed systems before the big bounce.