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Exact Energy Expansion of the two-dimensional Dyson Gas for Odd Values of Γ / 2

Using the expansion on monomial functions of the Vandermonde determinant to the power Γ = Q/(kBT ), a way to find the excess energy Uexc of the two dimensional one component plasma 2dOCP on the hard and soft disk (or Dyson Gas) for odd values of Γ/2 is provided. At Γ = 2, the current study not only corroborates the result for the particle-particle energy contribution of the Dyson gas found by Shakirov by using an alternative approach but also provides the exact N -finite expansion of the excess energy of the 2dOCP on the hard disk. The excess energy is fitted to an ansatz of the form Uexc = K N + K √ N + K + K/N + O(1/N) to study the finite-size corrections with K coefficients and N the number of particles. In particular, the bulk term of the excess energy is in agreement with the well known result of Jancovici for the hard disk in the thermodynamic limit. Finally, an expression is found for the pair correlation function which still keeps a link with the random matrix theory via the kernel in the Ginibre Ensemble for odd values of Γ/2. A comparison between analytical 2-body density function and histograms obtained with Monte Carlo simulations for small systems and Γ = 2, 6, 10, . . . shows that the approach described in this work may be used to study analytically the crossover behaviour from a disordered system to small crystals.