Tapobrata Bhattacharya

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The free energy of the Potts model : from the continuous to the first-order transition region. ABSTRACT We present a large q expansion of the 2d q-states Potts model free energies up to order 9 in 1/ √ q. Its analysis leads us to an ansatz which, in the first-order region, incorporates properties inferred from the known critical regime at q = 4, and(More)
We estimate, using a large-scale Monte Carlo simulation, the critical exponents of the antiferromagnetic Heisenberg model on a stacked triangular lattice. We obtain the following estimates: γ/ν = 2.011 ± .014, ν = .585 ± .009. These results contradict a perturbative 2 + ǫ Renormalization Group calculation that points to Wilson-Fisher O(4) behaviour. While(More)
This talk summarizes the quenched calculation of fB and fB s presented in [1]. The heavy quark is simulated using an O(1/M 2) improved NRQCD action, and the tadpole improved clover action is used for the light quarks. The axial current includes the O(1/M) corrections in one-loop perturbation theory and the O(1/M 2) ones at tree-level. We discuss the various(More)
We develop an ansatz for expressing the free energy of the two dimensional q-states Potts model for q > 4 near its first order phase transition point. We notice that for the moderate values of q 15, the energy profile at the phase transition is not expressible as a sum of gaussians. We discuss how this affects the traditional finite size analysis of this(More)
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