# Phantom Domain Walls

## TL;DR

This paper studies phantom domain walls formed by two scalar fields, analyzing their structure, evolution, and impact on cosmic dynamics, concluding they cannot serve as dark energy due to their increasing tension.

## Contribution

It introduces a model of phantom domain walls with time-varying tension and examines their cosmological evolution and effects.

## Key findings

- Tension of phantom domain walls increases with cosmic time.
- The evolution introduces additional damping in their dynamics.
- Extended phantom defects cannot account for dark energy.

## Abstract

We consider a model with two real scalar fields which admits phantom domain wall solutions. We investigate the structure and evolution of these phantom domain walls in an expanding homogeneous and isotropic universe. In particular, we show that the increase of the tension of the domain walls with cosmic time, associated to the evolution of the phantom scalar field, is responsible for an additional damping term in their equations of motion. We describe the macroscopic dynamics of phantom domain walls, showing that extended phantom defects whose tension varies on a cosmological timescale cannot be the dark energy.