# On the generalized spinor classification: Beyond the Lounesto's Classification

## TL;DR

This paper develops a generalized spinor classification extending Lounesto's framework by exploring dual structures and Clifford algebra deformation, ensuring mathematical consistency and physical observables.

## Contribution

It introduces a new classification scheme based on dual structure freedom and Clifford algebra deformation, surpassing traditional Lounesto classification.

## Key findings

- Recover the Lounesto classification in a specific limit
- Identify restrictions on spinor classes imposed by Fierz-Pauli-Kofink identities
- Propose Clifford algebra deformation to maintain real spinorial densities

## Abstract

In this paper we advance into a generalized spinor classification, based on the so-called Lounesto's classification. The program developed here is based on an existing freedom on the spinorial dual structures definition, which, in a certain simple physical and mathematical limit, allows us to recover the usual Lounesto's classification. The protocol to be accomplished here gives full consideration in the understanding of the underlying mathematical structure, in order to satisfy the quadratic algebraic relations known as Fierz-Pauli-Kofink identities, and also to provide physical observables. As we will see, such identities impose a given restriction on the number of possible spinorial classes allowed in the classification. We also expose a mathematical device known as \emph{Clifford's algebra deformation}, which ensures real spinorial densities and holds the Fierz-Pauli-Kofink quadratic relations.