# Interface Collisions

## TL;DR

This paper develops a theoretical framework to analyze the properties of collisions between growing interfaces, revealing that their statistical characteristics depend on initial growth kinetics but are unaffected by interaction details, with implications for material grain boundaries.

## Contribution

It introduces a novel theoretical approach to study interface collisions, linking their properties to growth kinetics and supporting findings with lattice model simulations.

## Key findings

- Collision interface properties depend on initial growth kinetics.
- Statistical distributions may be non-universal.
- Simulation results support the theoretical framework.

## Abstract

We provide a theoretical framework to analyze the properties of frontal collisions of two growing interfaces considering different short range interactions between them. Due to their roughness, the collision events spread in time and form rough domain boundaries, which defines collision interfaces in time and space. We show that statistical properties of such interfaces depend on the kinetics of the growing interfaces before collision, but are independent of the details of their interaction and of their fluctuations during the collision. Those properties exhibit dynamic scaling with exponents related to the growth kinetics, but their distributions may be non-universal. These results are supported by simulations of lattice models with irreversible dynamics and local interactions. Relations to first passage processes are discussed and a possible application to grain boundary formation in two-dimensional materials is suggested.