Geometrical Origin of the Cosmological Term

TL;DR

This paper explores how a scalar field's nonmetricity can generate a variable cosmological term, influencing the universe's expansion dynamics over time.

Contribution

It introduces a geometric origin for the cosmological term via nonmetricity from a scalar field, a novel approach in cosmological models.

Findings

The cosmological term varies over cosmic time.

Nonmetricity from a scalar field exists as a cosmic field.

The variable cosmological term dominates early universe expansion.

Abstract

Nonmetricity derived from a scalar field is shown to exist as a cosmic field, without direct coupling to matter. It leads to a variable cosmological term, a term that dominates the expansion in the early universe but dies away at later time.