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The complexity of approximating the matching polynomial in the complex plane

We study the problem of approximating the value of the matching polynomial on graphs with edge parameter $γ$, where $γ$ takes arbitrary values in the complex plane. When $γ$ is a positive real, Jerrum and Sinclair showed that the problem admits an FPRAS on general graphs. For general complex values of $γ$, Patel and Regts, building on methods developed by Barvinok, showed that the problem admits an FPTAS on graphs of maximum degree $Δ$ as long as $γ$ is not a negative real number less than or equal to $-1/(4(Δ-1))$. Our first main result completes the picture for the approximability of the matching polynomial on bounded degree graphs. We show that for all $Δ\geq 3$ and all real $γ$ less than $-1/(4(Δ-1))$, the problem of approximating the value of the matching polynomial on graphs of maximum degree $Δ$ with edge parameter $γ$ is #P-hard. We then explore whether the maximum degree parameter can be replaced by the connective constant. Sinclair et al. showed that for positive real $γ$ it is possible to approximate the value of the matching polynomial using a correlation decay algorithm on graphs with bounded connective constant (and potentially unbounded maximum degree). We first show that this result does not extend in general in the complex plane; in particular, the problem is #P-hard on graphs with bounded connective constant for a dense set of $γ$ values on the negative real axis. Nevertheless, we show that the result does extend for any complex value $γ$ that does not lie on the negative real axis. Our analysis accounts for complex values of $γ$ using geodesic distances in the complex plane in the metric defined by an appropriate density function.