# The Many Guises of a Neutral Fermion Singlet

## TL;DR

This paper explores various theoretical scenarios involving a neutral fermion singlet added to the standard model, including the potential spontaneous breaking of baryon number and the emergence of a massless 'sakharon' particle.

## Contribution

It introduces new possibilities for physics beyond the standard model by analyzing the roles of neutral fermion singlets, including baryon number breaking and novel particle states.

## Key findings

- Multiple scenarios for neutral fermion singlet integration into the standard model.
- Proposal of spontaneous baryon number breaking leading to a massless 'sakharon'.
- Discussion of diverse implications for new physics beyond current models.

## Abstract

The addition of a neutral fermion singlet to the standard model of particle interactions leads to many diverse possibilities. It is not necessarily a right-handed neutrino. I discuss many of the simplest and most interesting scenarios of possible new physics with this approach. In particular I propose the possible spontaneous breaking of baryon number, resulting in the massless 'sakharon'.