We discuss the physics of sound propagation and charge diffusion in a plasma with non-vanishing density. Our analysis culminates program initiated arXiv:2108.03244 to construct an open effective field theory low-lying modes stress tensor current such plasmas. model holographically as Reissner-Nordstrom-AdS black hole, study linearized fluctuations longitudinally polarized scalar gravitons photo...

We prove a vector-valued version of Muić's integral non-vanishing criterion for Poincaré series on the upper half-plane H. Moreover, we give an accompanying result construction modular forms in form series. As application these results, construct and study classical elliptic

We study non-linear primordial adiabatic and isocurvature perturbations and their non-Gaussianity. After giving a general formulation in the context of an extended δN formalism, we analyse in detail two illustrative examples. The first is a mixed curvaton-inflaton scenario in which fluctuations of both the inflaton and a curvaton (a light isocurvature field during inflation) contribute to the p...

This paper addresses practical aspects of the application of the backstepping method to the control of industrial processes. The limitations are emphased and solutions are proposed. The steady-state performances of the backstepping-based controllers are enhanced via the introduction of an integral action in the controller. In presence of non-zero mean perturbations, this modification guarantees...