# Interaction between Everett worlds and fundamental decoherence in Non-unitary Newtonian Gravity

## TL;DR

This paper interprets Non-unitary Newtonian Gravity through a path integral approach involving pairs of paths, highlighting gravitational decoherence as a communication mechanism between wave function branches.

## Contribution

It introduces a novel path integral formulation of NNG, linking gravitational decoherence with interactions between different quantum histories.

## Key findings

- Path integral with pairs of paths models gravitational decoherence.
- Correlations between paths act as communication between wave function branches.
- Provides a new perspective on non-unitary gravity theories.

## Abstract

It is shown that Non-unitary Newtonian Gravity (NNG) model admits a simple interpretation in terms of Feynman path integral, in which the sum over all possible histories is replaced by a summation over pairs of paths. Correlations between different paths are allowed by a fundamental decoherence mechanism of gravitational origin and can be interpreted as a kind of communication between different branches of the wave function. The ensuing formulation could be used in turn as a motivation to introduce Non-unitary Gravity itself.