3 papers
math-ph2005
Geometric heat comparison criteria for Riemannian manifolds
Leon Karp, Norbert Peyerimhoff
The main results of this article are small time heat comparison results for two points in two manifolds with characteristic functions as initial temperature distributions (Theorems…
math-ph2004
Elliptic operators on planar graphs: Unique continuation for eigenfunctions and nonpositive curvature
S. Klassert, D. Lenz, N. Peyerimhoff +1
This paper is concerned with elliptic operators on plane tessellations. We show that such an operator does not admit a compactly supported eigenfunction, if the combinatorial curva…
math.DG2002
The Cheeger constant of simply connected, solvable Lie groups
Norbert Peyerimhoff, Evangelia Samiou
We show that the Cheeger isoperimetric constant of a solvable simply connected Lie group with Lie algebra $\G$ is $h(G)=\max_{H\in\G,||H||=1} \tr(\ad (H))$.