Gravitons (in Feynman diagrams) are basically two wavy lines. I am interested in this type of diagram here:
However, the single wavy line should become a double wavy line. The code used to generate the above image is this:
\documentclass{article}
\usepackage{tikz}
\usepackage[compat=1.1.0]{tikz-feynman}
\usepackage[active,pdftex,tightpage]{preview}
\PreviewEnvironment[{[]}]{tikzpicture}
\begin{document}
\feynmandiagram[layered layout,inline=(a.base),horizontal=a to c] {
a -- [charged scalar,momentum'={[arrow shorten=0.2]\(p\)}] b -- [double,double distance=0.5ex, photon, out=135, in=45, loop, min distance=1.5cm,momentum={[arrow shorten=0.35]\(k\)}] b,
b -- [charged scalar,momentum'={[arrow shorten=0.2]\(p\)}] c,
};
\end{document}
I added a double,double distance=0.5ex
to the photon propagator, but apparently the photon
overrides that style. Does anybody know how to double the wavy line?