Abstract
We investigate the statistical properties of translation invariant random fields (including point processes) on Euclidean spaces (or lattices) under constraints on their spectrum or structure function. An important class of models that motivate our study are hyperuniform and stealthy hyperuniform systems, which are characterised by the vanishing of the structure function at the origin (resp., vanishing in a neighbourhood of the origin). We show that many key features of two classical statistical mechanical measures of randomness—namely, fluctuations and entropy, are governed only by some particular local aspects of their structure function. We obtain exponents for the fluctuations of the local mass in domains of growing size, and show that spatial geometric considerations play an important role—both the shape of the domain and the mode of spectral decay. In doing so, we unveil intriguing oscillatory behaviour of spatial correlations of local masses in adjacent box domains. We describe very general conditions under which we show that the field of local masses exhibit Gaussian asymptotics, with an explicitly described limit. We further demonstrate that stealthy hyperuniform systems with joint densities exhibit degeneracy in their asymptotic entropy per site. In fact, our analysis shows that entropic degeneracy sets in under much milder conditions than stealthiness, as soon as the structure function fails to be logarithmically integrable.
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Acknowledgements
The research of Kartick Adhikari was supported by Zeff Fellowship, Viterbi Fellowship and Israel Science Foundation, Grant 2539/17 and Grant 771/17. The work of Subhroshekhar Ghosh was supported in part by the MOE grants R-146-000-250-133 and R-146-000-312-114. The work of Joel L. Lebowitz was supported by AFOSR Grant FA9550-16-1-0037. We thank the referees for insightful comments and suggestions.
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Appendix
Appendix
For the sake of completeness, the Riemann-Lebesgue lemma is stated below, see [Eps08, Lemma 4.2.1].
Lemma 4
(Riemann Lebesgue lemma). If f is \(L^1\) integrable on \({\mathbb {R}}^d\), that is to say, if the Lebesgue integral of |f| is finite, then the Fourier transform of f satisfies
Theorem 9
([Kat04, P. 152]). If \(e^{P(\xi )}\) is the Fourier-Stieltjes transform of a positive measure, with P a polynomial, then \(\deg P\le 2\).
For the sake of completeness, the proof of Lemma 3 is given below.
Proof of Lemma 3
Let g be the joint density function of the random vector G. Then g is given by
where \(\Sigma _d=(\sigma (i,j))_{d\times d}\) with \(\sigma (i,j)=\text{ E }[X_iX_j]\) and \(x=(x_1,\ldots , x_d)\). Let f be the continuous density function of the random variable X. The relative entropy (also known as Kullback-Leibler divergence) between f and g is given by
Note that we have
Which implies that, as \(\text{ E }[X_iX_j]=\text{ E }[G_iG_j]\) for all i, j,
Thus we have \( h(G)-h(X)\ge 0. \) Moreover, the properties of Kullback-Leibler divergence imply that \(h(X)=h(G)\) when \(f=g\). Hence the result. \(\quad \square \)
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Adhikari, K., Ghosh, S. & Lebowitz, J.L. Fluctuation and entropy in spectrally constrained random fields. Commun. Math. Phys. 386, 749–780 (2021). https://doi.org/10.1007/s00220-021-04150-7
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DOI: https://doi.org/10.1007/s00220-021-04150-7