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We show that the spectral-gap of a general zero range process can becontrolled in terms of the spectral-gap of a single particle. This is in thespirit of Aldous' famous spectral-gap conjecture for the interchange process.Our main inequality decouples the role of the geometry (defined by the jumpmatrix) from that of the kinetics (specified by the exit rates). Among otherconsequences, the various spectral-gap estimates that were so far onlyavailable on the complete graph or the $d$-dimensional torus now extendeffortlessly to arbitrary geometries. As an illustration, we determine theexact order of magnitude of the spectral-gap of the rate-one $\textbf{ZRP}$ onany regular graph and, more generally, for any doubly stochastic jump matrix.

A version of Aldous' spectral-gap conjecture for the zero range process