Multiplicative Conservation of Baryon Number and Baryogenesis

TL;DR

This paper explores a novel concept where baryon number is multiplicatively conserved, providing a new mechanism for baryogenesis within a supersymmetric string-inspired model, and discusses related phenomena like neutrino masses and long-lived matter.

Contribution

It introduces the idea of multiplicative conservation of baryon number for baryogenesis, extending the known leptogenesis framework to baryons in a supersymmetric E(6) model.

Findings

Baryon number can be multiplicatively conserved, enabling baryogenesis.

The model allows two-loop radiative neutrino masses.

Predicts very long-lived exotic matter.

Abstract

In the canonical seesaw mechanism of neutrino mass, lepton number is only multiplicatively conserved, which enables the important phenomenon of leptogenesis to occur, as an attractive explanation of the present baryon asymmetry of the Universe. A parallel possibility, hitherto unrecognized, also holds for baryon number and baryogenesis. This new idea is shown to be naturally realized in the context of a known supersymmetric string-inspired extension of the Standard Model, based on E(6) particle content, and having an extra U(1)_N gauge symmetry. Within this framework, two-loop radiative neutrino masses are also possible, together with a new form of very long-lived matter.