# FAKE GUT

## TL;DR

This paper introduces 'fake GUT', a new framework where the apparent unification of matter fields in $SU(5)$ arises from chiral gauge theories, predicting more diverse nucleon decay modes than traditional GUT models.

## Contribution

The paper proposes a novel 'fake GUT' framework explaining matter unification without embedding quarks and leptons into common $SU(5)$ multiplets, expanding GUT phenomenology.

## Key findings

- Predicts a richer variety of nucleon decay modes.
- Explains matter unification through chiral $SU(5)$ gauge theory.
- Does not require matter fields to be in complete $SU(5)$ multiplets.

## Abstract

The perfect fit of the matter fields of the Standard Model (SM) into the $SU(5)$ multiplets has strongly supported the idea of the Grand Unified Theory (GUT) for decades. In this paper, we discuss a novel framework which explains why the SM matter fields form the apparently complete $SU(5)$ multiplets. In the new framework, the apparent matter unification inevitably results from chiral $SU(5)$ gauge theory even if the quarks and leptons are not embedded into the common $SU(5)$ multiplets. We call this class of models the "fake GUT". The novel phenomenological prediction of the fake GUT is more variety of the nucleon decay modes than the conventional GUT, which reflects the rich structure of the origin of the matter fields.