Work

Spatially flat FLRW spacetimes with a Big Bang from matrix geometry

Year: 2025

Type: article

Abstract: We present an expanding, spatially flat ( k = 0 ) FLRW quantum spacetime with a Big Bang, considered as a background in Yang-Mills matrix models. The FLRW geometry emerges in the semi-classical limit as a projection from the fuzzy hyperboloid. We analyze the propagation of scalar fields, and demonstrate that their Feynman propagator resembles the Minkowski space Feynman propagator in the semi-classical regime. Moreover, the higher spin modes predicted by the matrix model are described explicitly. These results are compared to recent results on k = − 1 FLRW quantum spacetimes with a Big Bounce.

Source: Nuclear Physics B

DOI: 10.1016/j.nuclphysb.2025.116988

Authors: Christian Gaß, Harold C. Steinacker

Institution: University of Vienna

Language: English

Topic: Noncommutative and Quantum Gravity Theories

Subfield: Statistical and Nonlinear Physics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: diamond

Funder: Austrian Science Fund

Award: Quantum Spacetime and Gravity in Matrix Models at one Loop