Cosmological models with non-canonical scalar and fermion fields: k-essence, f-essence and g-essence

TL;DR

This paper explores cosmological models involving non-canonical scalar and fermion fields, presenting exact solutions and analyzing their impact on universe acceleration, including models with bouncing and cyclic behaviors.

Contribution

It introduces new fermionic and bosonic-fermionic models with non-canonical kinetic terms and provides exact solutions and generalizations relevant to cosmological acceleration.

Findings

Exact solutions for f-essence models found

Models exhibit accelerated expansion effects

Bouncing and cyclic universe models proposed

Abstract

In the present work, we study the cosmological model with fermionic field and with the non-canonical kinetic term (f-essence). We also present some important reductions of the model as well as its some generalizations. We also found the exact solution of the model and examine the influence of such gravity-fermion interaction on the observed accelerated expansion of our universe. Several fermionic and bosonic-fermionic DBI models were constructed as some particular reductions of f-essence and g-essence, respectively and their Chaplygin gas counterparts are found. Finally, some nonlinear models of bouncing and cyclic universes are proposed.