The superfluid transition of a repulsive Bose gas in the presence of a sinusoidal potential which represents a simple-cubic optical lattice is investigated using quantum Monte Carlo simulations. At the average filling of one particle per well the critical temperature has a nonmonotonic dependence on the interaction strength, with an initial sharp increase and a rapid suppression at strong inter...

The transition from a regime dominated by drift instabilities to a regime dominated by pure interchange instabilities is investigated and characterized in the simple magnetized toroidal device TORPEX TORoidal Plasma EXperiment, A. Fasoli et al., Phys. of Plasmas 13, 055906 2006 . The magnetic field lines are helical, with a dominant toroidal component and a smaller vertical component. Instabili...

We propose an economic and cultural explanation for the decline of human fertility during the demographic transition. We show that some transformations in the economic and/or cultural structure of a society can imply a fertility transition, that is to say a transition from a traditional high births rate regime to a modern low births rate regime. Furthermore the cultural structure of the populat...

In this paper which is an extension of the work [1], we study the conditions required for validity of the generalized second law in phantom dominated universe in the presence of Schwarzschild black hole. Our study is independent of the origin of the phantom like behavior of the considered universe. We also discuss the generalized second law in the neighborhood of transition (from quintessence t...

We address the pair of conjugated field modes obtained from parametricdownconversion as a convenient system to analyze the quantum-classical transition in the continuous variable regime. We explicitly evaluate intensity correlations, negativity and entanglement for the system in a thermal state and show that a hierarchy of nonclassicality thresholds naturally emerges in terms of thermal and dow...

This paper develops a bivariate Markov Switching FIGARCH (MS-FIGARCH) process with constant and time varying transition probabilities as a way of modeling spot futures dynamics. An application of the model illustrates that the S&P500 and its futures exhibit long memory in volatility and structural breaks that are driven by changes in the cost of carry. The model with constant transition probabi...

This paper develops and estimates a continuous-time model of the term structure of interests under regime shifts. The model uses an analytically simple representation of Markov regime shifts that elucidates the effects of regime shifts on the yield curve and gives a clear interpretation of regime-switching risk premiums. The model falls within the broad class of essentially affine models with a...

We use a recently developed order parameter expansion method to study the transition to synchronous firing occurring in a system of coupled active rotators under the exclusive presence of quenched noise. The method predicts correctly the existence of a transition from a rest state to a regime of synchronous firing and another transition out of it as the intensity of the quenched noise increases...

Only recently, 20 years after transition to a market system, has Russia regained a similar production level it had achieved on the eve of transition in 1991. This may sound surprising, given its low productivity under central planning which dropped even lower during the last decades, and the rather high level of human capital inherited from the old regime, considered by many as the main engine ...

In this paper which is an extension of the work [1], we study the conditions required for validity of the generalized second law in phantom dominated universe in the presence of Schwarzschild black hole. Our study is independent of the origin of the phantom like behavior of the considered universe. We also discuss the generalized second law in the neighborhood of transition (from quintessence t...