# Does gravity have to be quantized? Lessons from non-relativistic toy models

## TL;DR

This paper reviews Newtonian toy models of semiclassical gravity, demonstrating that such models can be consistent and challenging the assumption that gravity must be quantized.

## Contribution

It introduces non-relativistic toy models of semiclassical gravity, showing their potential consistency and questioning the necessity of quantizing gravity.

## Key findings

- Semiclassical models can be consistent without full quantization.
- Toy models challenge the view that gravity must be fundamentally quantum.
- These models highlight issues with mean-field approaches in gravity.

## Abstract

It is often argued that gravity has to be a quantum theory simply because a fundamentally semiclassical approach would necessarily be inconsistent. Here I review recent Newtonian toy models of (stochastic) semiclassical gravity. They provide one option to implement a force semiclassically without getting into the known problems associated with mean-field. These models are not complete theories and should not be considered too seriously, but their consistency shows that semiclassical gravity is hard to dismiss on purely theoretical grounds.