sine-Gordon for Higgs doublet
=============================

## Maintainer:

Alberto Roper Pol <alberto[dot]roperpol/unige[dot]ch>

## Added:

07-Sep-2025

## Status:

succeeds

## Recommended resolution:

128x1x1

## Comments:

reproduces the analytic solution, only one component of the
doublet is non-zero but all are evolved, reproduces same result as sine-Gordon

## Links:
* http://pencil-code.nordita.org/samples/1d-tests/sine-Gordon

## References:

*  [wiki](https://en.wikipedia.org/wiki/Sine-Gordon_equation)