Aaron Smith

  1. A Gibbs Sampler on the n-Simplex.

    Authors: Aaron Smith
    Subjects: Probability
    Abstract

    We determine the mixing time of a simple Gibbs sampler on the unit simplex,
    confirming a conjecture of D. Aldous. The upper bound is based on a two-step
    coupling, where the first step is a simple contraction argument and the second
    step is a non-Markovian coupling. We also present a MCMC-based perfect sampling
    algorithm that is based on our proof and which can be applied to Gibbs samplers
    that are harder to analyze.

  2. A Riemann Hilbert correspondence for infinity local systems.

    Authors: Jonathan Block, Aaron Smith
    Subjects: Algebraic Topology
    Abstract

    We descibe a dg-equivalence of dg-categories between Block's
    $\mathcal{P}_{\A}$, corresponding to the de Rham dga $\A$ of a compact manifold
    M and the dg-category of $\infty$-local systems on M. We understand this as a
    generalization of the Riemann-Hilbert correspondence to $\Z$-graded connections
    (superconnections in some formulations). An $\infty$-local system is an
    $(\infty,1)$ functor between the $(\infty,1)$-categories ${\pi}_{\infty}M$ and
    the linear simplicial nerve of the dg-category of cochain complexes.

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