On the propagation across the big bounce in an open quantum FLRW cosmology

Autor(en)

Emmanuele Battista, Harold C. Steinacker

Abstrakt

The propagation of a scalar field in an open FLRW bounce-type quantum spacetime is examined, which arises within the framework of the IKKT matrix theory. In the first part of the paper, we employ general-relativity tools to study null and timelike geodesics at the classical level. This analysis reveals that massless and massive non-interacting particles can travel across the big bounce. We then exploit quantum-field-theory techniques to evaluate the scalar field propagator. In the late-time regime, we find that it resembles the standard Feynman propagator of flat Minkowski space, whereas for early times it governs the propagation across the big bounce and gives rise to a well-defined correlation between two points on opposite sheets of the spacetime.

Organisation(en)

Mathematische Physik

Journal

European Physical Journal C

Band

82

Anzahl der Seiten

24

ISSN

1434-6044

DOI

https://doi.org/10.1140/epjc/s10052-022-10874-0

Publikationsdatum

10-2022

Peer-reviewed

Ja

ÖFOS 2012

103028 Relativitätstheorie, 103012 Hochenergiephysik

ASJC Scopus Sachgebiete

Engineering (miscellaneous), Physics and Astronomy (miscellaneous)

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/d58dc0d1-82fb-4678-87da-850c3fd8e7c1