Edit and compile if you like:
\documentclass[svgnames,tikz]{standalone}\def\unit{5}\begin{document}\begin{tikzpicture}[thick]% Coordinates of initial, end and midpoints of transition to complexity\coordinate (qea) at (-1/5*\unit,-5/12*\unit); % quantum effective action\coordinate (ma1) at (2/5*\unit,1/2*\unit); % microscopic action 1\coordinate (ma2) at (3/5*\unit,1/3*\unit); % microscopic action 2\coordinate (ma3) at (\unit,1/2*\unit); % microscopic action 3\coordinate (r1) at (1/6*\unit,1/4*\unit); % regulator 1\coordinate (r2) at (2/5*\unit,1/10*\unit); % regulator 2\coordinate (r3) at (1/2*\unit,-1/5*\unit); % regulator 3% Coordinate system\draw[->] (0,0) -- (0,2/3*\unit) node[below right] (l1) {$\lambda_1$};\draw[->] (0,0) -- (-1/2*\unit,-1/2*\unit) node[below right] (l2) {$\lambda_2$};\draw[->] (0,0) -- (1/7*\unit,-2/3*\unit) node[above left] (l3) {$\lambda_3$};\draw[->] (0,0) -- (5/6*\unit,-1/2*\unit) node[below left] (l4) {$\lambda_4$};\draw[->] (0,0) -- (\unit,0);\draw[line width=2,line cap=round,dash pattern=on 0pt off 5\pgflinewidth] (3/4*\unit,-3/10*\unit) edge[bend right=20] (5/6*\unit,-1/10*\unit);% Flow trajectories\draw[dashed] (ma1) edge[->,in=50,out=210] (r1) (r1) node[below right] {$R_1$} to[out=240,in=40] (qea);\draw[dashed] (ma2) edge[->,in=60,out=220] (r2) (r2) node[right] {$R_2$} to[out=250,in=20] (qea);\draw[dashed] (ma3) edge[->,in=40,out=240] (r3) (r3) node[below right] {$R_3$} to[out=220,in=0] (qea);% Initial and end points\fill[DarkRed] (qea) circle (0.1) node[below] {$\Gamma_{k=0} = \Gamma$};\fill[DarkBlue] (ma1) circle (0.1) node[above] {$\Gamma_{k=\Lambda_1} = S_1$};\fill[DarkBlue] (ma2) circle (0.1) node[above] {$\Gamma_{k=\Lambda_2} = S_2$};\fill[DarkBlue] (ma3) circle (0.1) node[above] {$\Gamma_{k=\Lambda_3} = S_3$};\end{tikzpicture}\end{document}
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This file is available on tikz.netlify.app and on GitHub and is MIT licensed.
See more on the author page of Janosh Riebesell..