Computer Science and Engineering

Theory Seminar

Improved Analysis of Higher Order Random Walks

Vedat Levi AlevUniversity of Waterloo
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Abstract: Local spectral expansion is a very useful method for arguing about the spectral properties of several random walk matrices over simplicial complexes. Our main result is a sharp upper bound on the second eigenvalue of the down-up walk on a pure simplicial complex, in terms of the second eigenvalues of its links. We discuss some applications of this result in analyzing mixing times of Markov chains which include some recent breakthroughs in sampling problems.

Organizer

Greg Bodwin

Organizer

Euiwoong Lee