Back Reaction Inhomogeneities in Cosmological Parameter Evolution via Noncommutative Fluid

TL;DR

This paper explores how noncommutative geometry effects in fluid models can influence cosmological parameters, potentially mimicking dark matter or dark energy, through back reaction effects in the universe's evolution.

Contribution

It introduces a generalized action formulation of noncommutative fluid models and demonstrates their potential to replicate dark matter or dark energy effects in cosmology.

Findings

Noncommutative effects can act as kinematical dark matter.

Noncommutative effects can also serve as a cosmological constant.

The model provides a new perspective on back reaction in cosmology.

Abstract

The paper discusses back reaction effects in cosmology, (\'{a} la Buchert et. al.), induced by noncommutative geometry effects in fluid. We have used generalizations of an action formulation of noncommutative fluid model, proposed earlier by us. We show that the noncommutative effects, depending on its nature, can play either roles of (kinematical) dark matter or Cosmological Constant.