# Symmetric configurations highlighted by collective quantum coherence

## TL;DR

The paper proposes that collective quantum coherence can naturally select symmetric configurations in quantum gravity models, demonstrated through tensor network examples, potentially explaining the emergence of symmetric macroscopic spacetimes.

## Contribution

It introduces a mechanism where quantum coherence favors symmetric configurations, supported by concrete examples in tensor networks related to quantum gravity models.

## Key findings

- Large peaks at symmetric configurations in tensor networks.
- Preference for charge quantization even in Abelian cases.
- Potential to explain emergence of symmetric macroscopic spacetimes.

## Abstract

Recent developments in quantum gravity have shown the Lorentzian treatment to be a fruitful approach towards the emergence of macroscopic spacetimes. In this paper, we discuss another related aspect of the Lorentzian treatment: we argue that collective quantum coherence may provide a simple mechanism for highlighting symmetric configurations over generic non-symmetric ones. After presenting the general framework of the mechanism, we show the phenomenon in some concrete simple examples in the randomly connected tensor network, which is tightly related to a certain model of quantum gravity, i.e., the canonical tensor model. We find large peaks at configurations invariant under Lie-group symmetries as well as a preference for charge quantization, even in the Abelian case. In future study, this simple mechanism may provide a way to analyze the emergence of macroscopic spacetimes with global symmetries as well as various other symmetries existing in nature, which are usually postulated.