First-principles derivation of density functional formalism for quenched-annealed systems

We derive from first principles (without resorting to the replica trick) a density functional theory for fluids in quenched disordered matrices (QA-DFT). We show that the disorder-averaged free energy of the fluid is a functional of the average density profile of the fluid as well as the pair correlation of the fluid and matrix particles. For practical reasons it is preferable to use another functional: the disorder-averaged free energy plus the fluid-matrix interaction energy, which, for fixed fluid-matrix interaction potential, is a functional only of the average density profile of the fluid. When the matrix is created as a quenched configuration of another fluid, the functional can be regarded as depending on the density profile of the matrix fluid as well. In this situation, the replica-Ornstein-Zernike equations which do not contain the blocking parts of the correlations can be obtained as functional identities in this formalism, provided the second derivative of this functional is interpreted as the connected part of the direct correlation function. The blocking correlations are totally absent from QA-DFT, but nevertheless the thermodynamics can be entirely obtained from the functional. We apply the formalism to obtain the exact functional for an ideal fluid in an arbitrary matrix, and discuss possible approximations for non-ideal fluids.Comment: 19 pages, uses RevTeX

Adjustment and the labor market

How has the labor market responded to changes in macroeconomic conditions and related government policies? And to what extent has government intervention affected the microeconomic functioning of the labor market. Geographical immobility of workers does not seem to hinder adjustment. Labor is increasingly deployed in nontradables and import competing sectors, however, and problems of mobility between tradables and nontradables are reported. In addition, shortages of skilled manpower are reported. There is little evidence of wage resistence where wage indexation is not institutionalized. Traditional methods of wage support have become less important in the past two decades. Where effective minimum wage policies exist, they have the expected distortionary effects. Wage differences between the public and private sectors, particularly in sub-Saharan Africa, have continued to widen, and the efficiency of the public sector has declined as a result. Job security regulations may be an obstacle to structural adjustment programs insofar as they hinder the release of labor from contracting sectors.Environmental Economics&Policies,Banks&Banking Reform,Economic Theory&Research,Health Economics&Finance,Poverty Assessment

Magnetic dipole moments for composite dark matter

We study neutral dark matter candidates with a nonzero magnetic dipole moment. We assume that they are composite states of new fermions related to the strong phase of a new gauge interaction. In particular, invoking a dark flavor symmetry, we analyze the composition structure of viable candidates depending on the assignations of hypercharge and the multiplets associated to the fundamental constituents of the extended sector. We determine the magnetic dipole moments for the neutral composite states in terms of their constituents masses.Comment: 22 pages, 3 figure