The Sixth-Moment Sum Rule for the Pair Correlations of the Two-Dimensional One-Component Plasma: Exact Result |
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Authors: | P Kalinay P Marko? L ?amaj I Travěnec |
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Institution: | (1) Institute of Physics, Slovak Academy of Sciences, 842 28 Bratislava, Slovakia |
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Abstract: | The system under consideration is a two-dimensional one-component plasma in the fluid regime, at density n and arbitrary coupling = e
2 (e=unit charge, =inverse temperature). The Helmholtz free energy of the model, as the generating functional for the direct pair correlation c, is treated in terms of a convergent renormalized Mayer diagrammatic expansion in density. Using specific topological transformations within the bond-renormalized Mayer expansion, we prove that the nonzero contributions to the regular part of the Fourier component of c up to the k
2-term originate exclusively from the ring diagrams (unable to undertake the bond-renormalization procedure) of the Helmholtz free energy. In particular, (k)=– /k
2+ /(8 n)–k
2/96( n)2]+O(k
4). This result fixes via the Ornstein–Zernike relation, besides the well-known zeroth-, second-, and fourth-moment sum rules, the new sixth-moment condition for the truncated pair correlation h, n(![pgr](/content/h626872672m60t60/xxlarge960.gif) n/2)3 r
6
h(r) d
r=3( –6)(8–3 )/4. |
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Keywords: | one-component plasma logarithmic interaction pair correlation diagrammatic expansion sum rule |
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