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Metropolis–Hastings reversiblizations of non-reversible Markov chains

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  • Choi, Michael C.H.

Abstract

We study two types of Metropolis–Hastings (MH) reversiblizations for non-reversible Markov chains with Markov kernel P. While the first type is the classical Metropolised version of P, we introduce a new self-adjoint kernel which captures the opposite transition effect of the first type, that we call the second MH kernel. We investigate the spectral relationship between P and the two MH kernels. Along the way, we state a version of Weyl’s inequality for the spectral gap of P (and hence its additive reversiblization), as well as an expansion of P. Both results are expressed in terms of the spectrum of the two MH kernels. In the spirit of Fill (1991) and Paulin (2015), we define a new pseudo-spectral gap based on the two MH kernels, and show that the total variation distance from stationarity can be bounded by this gap. We give variance bounds of the Markov chain in terms of the proposed gap, and offer spectral bounds in metastability and Cheeger’s inequality in terms of the two MH kernels by comparison of Dirichlet form and Peskun ordering.

Suggested Citation

  • Choi, Michael C.H., 2020. "Metropolis–Hastings reversiblizations of non-reversible Markov chains," Stochastic Processes and their Applications, Elsevier, vol. 130(2), pages 1041-1073.
    • Handle: RePEc:eee:spapps:v:130:y:2020:i:2:p:1041-1073
    DOI: 10.1016/j.spa.2019.04.006
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