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Euclidean, hyperbolic, discrete, convex, coarse geometry, metric spaces, comparisons in Riemannian geometry, symmetric spaces.

5 votes
2 answers
2k views

Triangle area on surfaces of constant curvature

I am looking for an elementary derivation of the formula for the area of a geodesic triangle lying in a surface of constant curvature $\kappa$, depending on the angles and side length. Of course, the …
8 votes
3 answers
1k views

Brownian motion on Metric spaces

Is there a generalization of Brownian motion to general metric spaces (which should probably be length spaces)? This should be a process satisfying $$d(B_t, B_s) \sim \mathcal{N}(0, t-s)$$ and such t …
3 votes

When does heat kernel have both Gaussian upper and lower bounds?

I do not know much about the case of metric spaces, but for the heat kernel on a (noncompact) manifold without boundary, these estimates exist. There are various papers and book by Grigor`yan on that …
Matthias Ludewig's user avatar