Remove vertical spacing around align* environment in tabularx cell

[Wrichik Basu]

I have created a table which has some equations in it. The LaTeX code is as follows:

\documentclass[a4paper,12pt]{article}

\usepackage{mathtools}
\usepackage{physics}
\usepackage{tabularx}
\usepackage{makecell}

\newcommand{\tev}{\ensuremath{\mathcal{U}}}
\newcommand{\sch}[1]{\ensuremath{#1^\mathrm{(S)}}}
\newcommand{\hei}[1]{\ensuremath{#1^\mathrm{(H)}}}
\newcommand{\Ham}{\ensuremath{\mathcal{H}}}
\newcommand{\bfnt}[1]{{\bfseries #1}}
\newcommand{\ifnt}[1]{{\itshape #1}}

\begin{document}

\begin{center}
        \begin{tabularx}{\linewidth}{|l|X|X|}
            
            \hline
            
            {} & \multicolumn{1}{c|}{\bfnt{Schr\"odinger picture}} & \multicolumn{1}{c|}{\bfnt{Heisenberg picture}} \\
            
            \hline
            
            \textbf{State ket} & \makecell[X]{\vspace{0.2cm} Moving:\\%
            \vbox{%
                \begin{align*}
                \ket{\alpha, t_0; t} &= \tev \ket{\alpha, t_0} \\[0.5em]
                i \hbar \pdv{t} \ket{\alpha, t_0; t} &= \Ham \ket{\alpha, t_0; t}.
                \end{align*}%
            }} & Stationary \\
            
            \hline
            
            \textbf{Observable} & Stationary & \makecell[X]{\vspace{0.3cm} Moving:\\%
            \vbox{%
                \begin{align*}
                \hei{A}(t) &= \tev^\dagger(t) \sch{A} \tev(t) \\[0.7em]
                \dv{\hei{A}}{t} &= \dfrac{1}{i\hbar} \comm{\hei{A}}{\Ham}.
                \end{align*}%
            }} \\
            
            \hline
            
            \textbf{Base ket} & Stationary & \makecell[X]{\vspace{0.3cm} Moving oppositely:\\%
            \vbox{%
                \begin{align*}
                \ket{a', t}_\mathrm{H} &= \tev^\dagger \ket{a'}; \\[0.7em]
                i\hbar\pdv{t} \ket{a', t}_\mathrm{H} &= -\Ham \ket{a', t}_\mathrm{H}.
                \end{align*}%
            }} \\
            
            \hline
        
        \end{tabularx}
    \end{center}

\end{document}

The code renders as shown below:

As you can see, there is a lot of extra vertical space around the align* environments, which I have marked with blue arrows. How can I remove this space?

 

[pasmith]

The lengths you need to set are

\abovedisplayskip
\belowdisplayskip
\abovedisplayshortskip
\belowdisplayshortskip

 

[Wrichik Basu]

@pasmith Thanks. Setting those lengths to 0pt reduced the spacing to what is normal. This is how it looks now:

The entire code (for future visitors):

\documentclass[a4paper,12pt]{article}

\usepackage{mathtools}
\usepackage{physics}
\usepackage{tabularx}
\usepackage{makecell}

\newcommand{\tev}{\ensuremath{\mathcal{U}}}
\newcommand{\sch}[1]{\ensuremath{#1^\mathrm{(S)}}}
\newcommand{\hei}[1]{\ensuremath{#1^\mathrm{(H)}}}
\newcommand{\Ham}{\ensuremath{\mathcal{H}}}
\newcommand{\bfnt}[1]{{\bfseries #1}}
\newcommand{\ifnt}[1]{{\itshape #1}}

\begin{document}

\bgroup

\setlength{\abovedisplayskip}{0pt}
\setlength{\belowdisplayskip}{0pt}
\setlength{\abovedisplayshortskip}{0pt}
\setlength{\belowdisplayshortskip}{0pt}

\begin{center}
        \begin{tabularx}{\linewidth}{|l|X|X|}
          
            \hline
          
            {} & \multicolumn{1}{c|}{\bfnt{Schr\"odinger picture}} & \multicolumn{1}{c|}{\bfnt{Heisenberg picture}} \\
          
            \hline
          
            \textbf{State ket} & \makecell[X]{\vspace{0.2cm} Moving:\\%
            \vbox{%
                \begin{align*}
                \ket{\alpha, t_0; t} &= \tev \ket{\alpha, t_0} \\[0.5em]
                i \hbar \pdv{t} \ket{\alpha, t_0; t} &= \Ham \ket{\alpha, t_0; t}.
                \end{align*}%
            }} & Stationary \\
          
            \hline
          
            \textbf{Observable} & Stationary & \makecell[X]{\vspace{0.3cm} Moving:\\%
            \vbox{%
                \begin{align*}
                \hei{A}(t) &= \tev^\dagger(t) \sch{A} \tev(t) \\[0.7em]
                \dv{\hei{A}}{t} &= \dfrac{1}{i\hbar} \comm{\hei{A}}{\Ham}.
                \end{align*}%
            }} \\
          
            \hline
          
            \textbf{Base ket} & Stationary & \makecell[X]{\vspace{0.3cm} Moving oppositely:\\%
            \vbox{
                \begin{align*}
                \ket{a', t}_\mathrm{H} &= \tev^\dagger \ket{a'}; \\[0.7em]
                i\hbar\pdv{t} \ket{a', t}_\mathrm{H} &= -\Ham \ket{a', t}_\mathrm{H}.
                \end{align*}
            }} \\
          
            \hline
      
        \end{tabularx}
    \end{center}

\egroup

\end{document}