# Primordial fluctuations from quantum gravity

## TL;DR

This paper investigates primordial quantum gravitational fluctuations using Loop Quantum Gravity, revealing large early universe fluctuations and correlations that could address the horizon problem.

## Contribution

It provides a numerical analysis of Lorentzian amplitudes in Loop Quantum Gravity during a non-semiclassical regime, highlighting the role of quantum effects in early universe structure.

## Key findings

- Homogeneous expectation value of the quantum geometry
- Large fluctuations in early quantum phase
- Strong but not maximal correlations

## Abstract

We study fluctuations and correlations between spacial regions, generated by the primordial quantum gravitational phase of the universe. We do so by a numerical evaluation of Lorentzian amplitudes in Loop Quantum Gravity, in a non-semiclassical regime. We find that the expectation value of the quantum state of the geometry emerging from the early quantum phase of the universe is a homogeneous space but fluctuations are very large and correlations are strong, although not maximal. In particular, this suggests that early quantum gravitational effects could be sufficient to solve the cosmological horizon problem.