Phantom cosmologies and fermions

TL;DR

This paper explores how form invariance transformations can generate phantom cosmologies from standard models, extending the concept from scalar fields to fermionic fields, revealing new accelerated regimes and analyzing fermionic cosmological constant groups.

Contribution

It introduces a novel extension of phantom cosmology generation techniques to fermionic fields, broadening the scope beyond scalar fields and uncovering new accelerated cosmological regimes.

Findings

Fermionic fields can exhibit phantomization leading to accelerated expansion.

The cosmological constant group for fermionic fluids is analyzed.

New classes of accelerated regimes are identified in fermionic phantom cosmologies.

Abstract

Form invariance transformations can be used for constructing phantom cosmologies starting with conventional cosmological models. In this work we reconsider the scalar field case and extend the discussion to fermionic fields, where the "phantomization" process exhibits a new class of possible accelerated regimes. As an application we analyze the cosmological constant group for a fermionic seed fluid.