Abstract
We consider the random Euclidean assignment problem on the line between two sets of N random points, independently generated with the same probability density function \(\varrho \). The cost of the matching is supposed to be dependent on a power \(p>1\) of the Euclidean distance of the matched pairs. We discuss an integral expression for the average optimal cost for \(N\gg 1\) that generalizes a previous result obtained for \(p=2\). We also study the possible divergence of the given expression due to the vanishing of the probability density function. The provided regularization recipe allows us to recover the proper scaling law for the cost in the divergent cases, and possibly some of the involved coefficients. The possibility that the support of \(\varrho \) is a disconnected interval is also analysed. We exemplify the proposed procedure and we compare our predictions with the results of numerical simulations.
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Notes
Here and in the following \(\theta (x)\) is the Heaviside function, such that \(\theta (x)=1\) if \(x\ge 0\), \(\theta (x)=0\) otherwise.
To obtain Eq. (17) we have introduced the Gauss hypergeometric function
$$\begin{aligned} {}_2F_1[a,b;c;z]{:}{=}\sum _{k=0}^\infty \frac{(a)_k(b)_k}{(c)_k}\frac{z^k}{k!},\quad (x)_k{:}{=}\prod _{n=0}^{k-1}(x+n), \end{aligned}$$and we have used the fact that
$$\begin{aligned} \sum _{k=1}^N\left( {\begin{array}{c}N\\ k\end{array}}\right) ^2 k^2z^{k}=N^2z\sum _{k=0}^\infty \frac{(1-N)_k(1-N)_k}{(1)_k}\frac{z^k}{k!}=N^2z\,{}_2F_1\left[ 1-N,1-N;1;z\right] . \end{aligned}$$
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Acknowledgements
The authors are grateful to Luigi Ambrosio for useful discussions and correspondence, and for pointing us to Ref. [28]. The authors also thank Giorgio Parisi, for many discussions on the assignment problem in Euclidean spaces. GS acknowledges the financial support of the Simons foundation (Grant No. 454949, Giorgio Parisi). The work presented in this article was supported by the project “Meccanica statistica e complessità”, a research grant funded by PRIN 2015 (Agreement no. 2015K7KK8L).
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Caracciolo, S., D’Achille, M. & Sicuro, G. Anomalous Scaling of the Optimal Cost in the One-Dimensional Random Assignment Problem. J Stat Phys 174, 846–864 (2019). https://doi.org/10.1007/s10955-018-2212-9
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DOI: https://doi.org/10.1007/s10955-018-2212-9