Some interacting dark energy models

TL;DR

This paper explores new cosmological models with non-gravitational interactions between dark matter and dark energy, aiming to better explain the universe's accelerated expansion through phenomenological approaches.

Contribution

It introduces new forms of dark sector interactions and applies cosmographic and $Om$ analyses to assess their viability in explaining cosmic acceleration.

Findings

Interaction models can improve fit to cosmological data

Phenomenological forms of interaction are consistent with accelerated expansion

Analysis supports potential of non-gravitational dark sector interactions

Abstract

In this paper we study new cosmological models involving new forms of non-gravitational interaction between cold dark matter and dark energy. The main purpose is to demonstrate the applicability of the forms of interaction to the problem in modern cosmology known as accelerated expansion of the large scale universe. It is well known, that a non-gravitational interaction can improve theoretical prediction, but a fundamental theory allowing to derive the form of the interaction is missing. Therefore, an active sought to find a correct form of the interaction from various phenomenological assumptions is still one of the active branches of research in modern cosmology. Besides cosmographic analysis, we perform $Om$ analysis.