Conductance and Eigenvalue

Abstract

We show the following. \begin{theorem} Let $M$ be an finite-state ergodic time-reversible Markov chain with transition matrix $P$ and conductance $\varphi$. Let $\lambda \in (0,1)$ be an eigenvalue of $P$. Then, $${\varphi }^2+{\lambda }^2\le 1$$ \end{theorem} This strengthens the well-known~\cite{HLW,Dod84, AM85, Alo86, JS89} inequality $\lambda \le 1-{\varphi }^2/2$. We obtain our result by a slight variation in the proof method in \cite{JS89, HLW}; the same method was used earlier in \cite{RS06} to obtain the same inequality for random walks on regular undirected graphs.