# Collapse models: main properties and the state of art of the experimental tests

## TL;DR

Collapse models modify quantum mechanics to resolve the measurement problem by ensuring wave function localization, with GRW and CSL being the most studied, and recent experimental tests advancing their validation.

## Contribution

This paper summarizes the main properties of collapse models and reviews the latest experimental efforts to test their predictions.

## Key findings

- Summary of GRW and CSL model features
- Overview of recent experimental tests
- Progress in constraining collapse model parameters

## Abstract

Collapse models represent one of the possible solutions to the measurement problem. These models modify the Schr\"odinger dynamics with non-linear and stochastic terms, which guarantee the localization in space of the wave function avoiding macroscopic superpositions, like that described in the Schr\"odinger's cat paradox. The Ghirardi-Rimini-Weber (GRW) and the Continuous Spontaneous Localization (CSL) models are the most studied among the collapse models. Here, we briefly summarize the main features of these models and the advances in their experimental investigation.