We present fully self-consistent calculations in the fluctuation exchange approximation for the half-filled Hubbard model in 2D. A non-fermi liquid state evolves with decreasing temperature in this self-consistent model of coupled spin fluctuations and quasiparticles. The mean field phase transition to long-range antiferromagnetic order is suppressed and we find no evidence of a phase transitio...

Abstract We present a self-consistent model of the Milky Way to reproduce observed distributions (spectral type, absolute J -band magnitude, effective temperature) and total velocity dispersion brown dwarfs. For our model, we adopt parametric forms for star formation history initial-mass function, published evolutionary models, theoretical age–velocity relations. Using standard Markov Chain Mon...

We show that it is possible to restore the symmetry associated with the Goldstone mode within the Self Consistent Random Phase Approximation (SCRPA) applied to the three-level Lipkin model. We determine one and two-body densities as very convergent expansions in terms of the generators of the RPA basis. We show that SCRPA excitations correspond to the heads of some rotational bands in the exact...