Abstract Motivated by recent problems in mathematical cosmology, which temporal averaging methods are applied order to analyse the future asymptotics of models exhibit oscillatory behaviour, we provide a theorem concerning large-time behaviour for solutions general class systems. We thus propose our result be applicable wide range spatially homogenous cosmology with behaviour. Mathematically bu...

We analyze the estimation of a time-dependent perturbation acting on continuously monitored quantum system. describe temporal fluctuations by hidden Markov model, and we combine measurement theory classical filter into time-evolving hybrid trajectory. The forward-backward analysis that permits smoothed estimates models has counterpart in retrodiction past states. As specific example, apply our ...

Time-consistency is a key feature of many important policy problems, such as those relating to optimal fiscal and monetary policy. It also for private-sector decision-making through mechanisms quasi-hyperbolic discounting. These problems are generally solved using some form projection method. The difficultly with methods that their computational complexity increases rapidly the number state var...

We consider an interpretation of the recent lattice data on the current-current correlators in the xspace. The data indicate rather striking difference between (axial)vector and (pseudo)scalar channels which goes beyond the predictions of the standard non-perturbative models. We argue that if the difference is to be explained by power corrections, there is a unique choice of the form of the cor...

We analyze an evolution of a localized flow in a half-plane bounded by a rigid wall when the total mass is not conserved within the equivalent-barotropic quasigeostrophic (QG) approximation. A simple formula expressing the total geostrophic mass in terms of the QG potential vorticity is derived and used to estimate the range of the geostrophic mass variability. Behaviour of the total mass is an...

“T-fold” backgrounds are generically-nongeometric compactifications of string theory, described by T fibrations over a base N with transition functions in the perturbative T-duality group. We review Hull’s doubled torus formalism, which geometrizes these backgrounds, and use the formalism to constrain the D-brane spectrum (to leading order in gs and α ) on T fibrations over S with O(n, n;Z) mon...