1

I am trying to do to write the wick contraction between w fields of the expression below. wick

I am using simpler-wick to do this but seems it not working. The code is given below

\documentclass{article}
\usepackage{simpler-wick}
\usepackage{amsmath}
\usepackage{amsfonts}
\usepackage{amssymb}

\begin{document}
$$
\wick{\left[\bar{\c1 w}{\mathcal{A}}(q)\right]^{\beta{1}\alpha_{1}}{n{3}n_{4}}
\left[ \c1 w_{\mathcal{A}}(-q)\right]^{\alpha_{2}\beta_{2}}{n{6}n_{5}}}
$$
\end{document}

Can anyone please help me with this? Thanks in advance.

Mico
  • 506,678
felix
  • 463

1 Answers1

2

A combination of (a) using \[ and \] instead of $$ to initiate and terminate display math mode, (b) replacing \bar{\c1 w} with \c1{\bar{w}}, and (c) employing \bigl and \bigr instead of \left and \right gets the job done. About not using \left and \right: I assume you were using the auto-sizing directives because you wanted to enlarge the square brackets. That's no working here, so no point in using them here.

Please see the posting Why is \[ ... \] preferable to $$ ... $$? for an in-depth discussion of why one shouldn't use $$ to initiate and terminate display math mode in LaTeX documents.

enter image description here

\documentclass{article}
\usepackage{simpler-wick}
\usepackage{amsmath}
%%\usepackage{amsfonts} % 'amsfonts' is loaded automatically by 'amssymb'
\usepackage{amssymb}

\begin{document}
[
\wick{\bigl[\c1{\bar{w}}{!\mathcal{A}}(q)\bigr]^{\beta{1}\alpha_{1}}{n{3}n_{4}},
      \bigl[\c1 w_{!\mathcal{A}}(-q)\bigr]^{\alpha_{2}\beta_{2}}{n{6}n_{5}}}
]
\end{document}
Mico
  • 506,678
  • Thank you! It is now working! – felix Feb 14 '22 at 09:56
  • @felix - You're most welcome. – Mico Feb 14 '22 at 09:56
  • @ Mico, I tried to color using \texttt{xcolor} each $w$ along with their indices while contracting but the output text is colored but without showing the contraction. Can you please put some remark fixing it? – felix Feb 15 '22 at 05:05
  • @felix - I don't think that \texttt{xcolor} stands a chance at coloring w correctly. I experience no trouble, though, if I replace \bar{w} and w with \textcolor{red}{\bar{w}} and {\textcolor{red}{w}}. As a general principle, I think it's prudent to present an item that needs to be processed by the simpler-wick machinery as a single math "atom" (or should that be "molecule"?). Hence, I suggest you write \c1{\textcolor{red}{\bar{w}}} and \c1{\textcolor{red}{w}}. – Mico Feb 15 '22 at 06:32