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arXiv · 2503.12859

The Density Formula Approach for Non-reversible Isomorphism Theorems, with Applications

Qinghua·Ding·Venkat Anantharam
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Abstract

The classical isomorphism theorems for reversible Markov chains have played an important role in studying the properties of local time processes of strongly symmetric Markov processes~\cite{mr06}, bounding the cover time of a graph by a random walk~\cite{dlp11}, and in topics related to physics, such as random walk loop soups and Brownian loop soups~\cite{lt07}. Non-reversible versions of these theorems have been discovered by Le Jan, Eisenbaum, and Kaspi~\cite{lejan08, ek09, eisenbaum13}. Here, we give a density-formula-based proof for all these non-reversible isomorphism theorems, extending the results in \cite{bhs21}. Moreover, we use this method to generalize the comparison inequalities derived in \cite{eisenbaum13} for permanental processes and derive an upper bound for the cover time of non-reversible Markov chains.

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Qinghua, Ding, Venkat Anantharam. 2026-05-21. The Density Formula Approach for Non-reversible Isomorphism Theorems, with Applications. https://arxiv.org/abs/2503.12859

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