On finite–temperature and –density radiative corrections to the neutrino effective potential in the early Universe Abstract Finite–temperature and –density radiative corrections to the neutrino effective potential in the otherwise CP –symmetric early Universe are considered in the real–time approach of Thermal Field Theory. A consistent perturbation theory endowed with the hard thermal loop res...

The generating functional for hard thermal loops in Quantum Chromodynamics is important in setting up a resummed thermal perturbation theory, so that all terms of a given order in the coupling constant can be consistently taken into account. It is also the functional which leads to a gauge invariant description of Debye screening and plasma waves in the quark-gluon plasma. We have recently show...

An approach to determine the value of the zero-temperature thermal exponent u in spin glasses is presented. It consists in describing the energy level spectrum in spin glasses only in terms of the properties of the lowest energy droplets and the lowest droplet exponents ~LDE’s! l l ,u l that describe the statistics of their sizes and gaps. We show how these LDE’s yield the standard thermal expo...

Scalar cosmological perturbations of a weakly self-interacting plasma mixed with a perfect radiation fluid are investigated. Effects of this plasma are considered through order λ3/2 of perturbative thermal-field-theory in the radiation dominated universe. The breakdown of thermal perturbation theory at vastly subhorizon scales is circumvented by a Padé approximant solution. Compared to collisio...

We investigate the hard nonresonant excitation of the forced Duffing equation with a positive damping parameter E. Using the symbolic manipulation system MACSYMA, a computer algebra system. we derive the two term perturbation expansion by the method of multiple time scales. The resulting approximate solution is valid for small values of the coefficient e As the damping parameter e increases, th...

in recent years, soft computing methods have generated a large research interest. the synthesis of the fuzzy logic and the evolutionary algorithms is one of these methods. a particular evolutionary algorithm (ea) is differential evolution (de). as for any ea, de algorithm also requires parameters tuning to achieve desirable performance. in this paper tuning the perturbation factor vector of de ...

in this paper, we investigate the application of the homotopy perturbation method (hpm) for solving a one-dimensional nonlinear inverse heat conduction problem. in this problem the thermal conductivity term is a linear function with respect to unknown heat temperature in bounded interval. furthermore, the temperature histories are unknown at the end point of the interval. this problem is ill-po...

Based on the Melnikov method, we investigate chaotic behaviors in extended thermodynamic phase space for a slowly rotating Kerr-AdS black hole under temporal and spatial perturbations. Our results show that perturbation coming from thermal quench of spinodal region diagram may cause chaos only when amplitude is above critical value, which involves angular momentum . Under perturbation, however,...