I think the phycisists jumped a dimension, doing Markov trees with four rates. There is no negative and positive curvatures, just a partition between three curvatures.
I doubt they close a sphere, likely close a torus. There are two rates of curvature,in w,x,y,z. w to x and w to y. Each of those should close. The continued fraction is now fourth degree. At low energy two of those curvatures can agree and this reverts back to a 3D system.
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