Spin-foam model for gravity coupled to massless scalar field

TL;DR

This paper develops a spin-foam model for gravity coupled with a massless scalar field, extending previous Loop Quantum Cosmology methods to the full theory, providing a new approach to quantum gravity.

Contribution

It introduces a spin-foam model for the full theory of gravity coupled to a scalar field, generalizing prior cosmological models to a more comprehensive framework.

Findings

Derived a new spin-foam model for coupled gravity and scalar fields

Extended cosmological scheme to full Loop Quantum Gravity

Provides a foundation for further quantum gravity research

Abstract

A spin-foam model is derived from the canonical model of Loop Quantum Gravity coupled to a massless scalar field. We generalized to the full theory the scheme first proposed in the context of Loop Quantum Cosmology by Ashtekar, Campiglia and Henderson, later developed by Henderson, Rovelli, Vidotto and Wilson-Ewing.