Vacuum energy in a noncommutative-geometry setting

TL;DR

This paper explores how noncommutative geometry, related to string theory, could explain the universe's accelerated expansion without relying on vacuum energy, challenging conventional cosmological models.

Contribution

It proposes a novel link between noncommutative geometry and the origin of dark energy, suggesting an alternative to vacuum energy explanations.

Findings

Noncommutative geometry may account for cosmic acceleration.

Vacuum energy could be zero despite quantum fluctuations.

Implications for dark energy's origin are discussed.

Abstract

It has recently been proposed that vacuum energy is zero in spite of the quantum-field fluctuations that occur everywhere, even at absolute zero. The implication is that dark energy must have a different origin, unrelated to vacuum energy. It is proposed in this paper that noncommutative geometry, an offshoot of string theory, may provide such an origin due to its ability to account for the accelerated expansion.