Matter-Antimatter Asymmetry Generated by Loop Quantum Gravity

TL;DR

This paper proposes that Loop Quantum Gravity introduces a new length scale that modifies fermion dispersion relations, providing a natural mechanism for matter-antimatter asymmetry at sub-GUT temperatures.

Contribution

It introduces a novel length scale in Loop Quantum Gravity that leads to lepton asymmetry through modified dispersion relations.

Findings

Lepton asymmetry can be generated at temperatures below GUT scale.

The new length scale affects fermion dispersion relations based on helicity.

Loop Quantum Gravity offers a natural explanation for matter-antimatter asymmetry.

Abstract

We show that Loop Quantum Gravity provides new mechanisms through which observed matter-antimatter asymmetry in the Universe can naturally arise at temperatures less than GUT scale. This is enabled through the introduction of a new length scale ${\cal L}$, much greater than Planck length ($l_P$), to obtain semi-classical weave states in the theory. This scale which depends on the momentum of the particle modifies the dispersion relation for different helicities of fermions and leads to lepton asymmetry.