# Relativistic bubble collisions -- a closer look

## TL;DR

This paper investigates scalar bubble collisions in relativistic first-order phase transitions, introducing a trapping equation to model wall behavior and analyzing energy dynamics relevant to gravitational wave signals.

## Contribution

It proposes a new trapping equation for bubble wall behavior post-collision and tests it with numerical simulations, enhancing understanding of gravitational wave production.

## Key findings

- Trapping equation accurately models wall behavior after collision.
- Energy dynamics post-collision influence gravitational wave signals.
- Numerical simulations validate the proposed theoretical framework.

## Abstract

We study scalar bubble collisions in first-order phase transitions focusing on the relativistic limit. We propose 'trapping equation' which describes the wall behavior after collision, and test it with numerical simulations in several setups. We also examine the energy dynamics after collision and discuss its implications to gravitational wave production.