Unimodular Cosmological models

TL;DR

This paper discusses how unimodular gravity offers an alternative explanation for the universe's exponential expansion, challenging the need for a cosmological constant or quintessence.

Contribution

It analyzes the implications of unimodular gravity on cosmological models, providing a novel perspective on cosmic acceleration without a cosmological constant.

Findings

Exponential expansion can be explained without a cosmological constant in unimodular gravity.

Unimodular gravity challenges the interpretation of observational data supporting dark energy.

The framework offers a different theoretical basis for cosmic acceleration.

Abstract

It is claimed that in the unimodular gravity framework the observational fact of exponential expansion of the universe cannot be taken as evidence for the presence for a cosmological constant or similar quintessence.