A systematic and unambiguous method of deriving generalized transport equations, i.e., equations for distribution functions having a single-time structure, on the basis nonequilibrium Green function is obtained, if common Kadanoff-Baym (KB) ansatz replaced by modification which we call KB ansatz. This new fully consistent with dynamical structure theory independent any specific representation. The resulting appear to be zeroth-order approximation expansion in terms collision duration. In...

The critical role of the immune system in brain function and dysfunction is well recognized, yet development therapies for psychiatric diseases has been slow due to concerns about iatrogenic deficiencies. These are emphasized by lack objective diagnostic tools psychiatry. A promise resolve this conundrum lies exploitation extracellular vesicles (EVs) that physiologically produced or can be synthetized. EVs regulate recipient cell functions offer potential EVs-based therapies. Intranasal...

We review the non-relativistic Green's-function approach to kinetic equations for Fermi liquids far from equilibrium. The emphasis is on consistent treatment of off-shell motion between collisions and non-instant non-local picture binary collisions. resulting equation Boltzmann type, it represents an interpolation theory transport in metals moderately dense gases. free particles renormalised by various mean field mass corrections spirit Landau's quasiparticles metals. are Enskog's non-ideal...

The quasiparticle approximation and corrections beyond it are derived from expansion in the spirit of virial corrections. This way, Boltzmann equation for electrons semiconductors is recovered nonequilibrium Green's functions without unjustified neglect former theory. present approach gives higher-order contributions to scattering rates provides observables as functionals distribution. application scheme same simplicity one based on approximation. Five applications phenomena scope presented:...

The Boltzmann equation for electrons in semiconductors at room temperature is recovered from nonequilibrium Green's functions. Our approach eliminates gradient corrections to scattering rates, reduces "possible" collisional broadening, provides backflows, and allows one evaluate rates of two-phonon processes.

We consider resonant tunneling through a double barrier when the electrons interact with longitudinal-optical phonons in double-barrier well. use tight-binding model for electron Hamiltonian, linear coupling to phonon modes. Phonon-mediated scattering amplitudes structure are efficiently obtained by recursive Green-function technique. This technique allows us go beyond unrealistic assumption of Lorentzian line shapes, used previous treatments. Our results qualitative agreement earlier...

This review deals with the state of art and perspectives description nonequilibrium many-body systems using Green's function (NGF) method. The basic aim is to describe time evolution system from its initial over transient dynamics long asymptotic evolution. First, we discuss aims transport theories motivate introduction NGF techniques. Second, this article summarizes present view on construction electron equations formulated within approach nonequilibrium. We incorporation complex conditions...

A nonequilibrium Ward identity (NE WI) connecting the scalar transport vertex correction with one-particle self-energy is derived using global $\mathrm{U}(1)$ symmetry of fermion Green's functions (NGF). The nonperturbative derivation does not depend on details many-body system. renormalized multiplicative composition rule for NGF, reflecting time coherence, obtained and related to NE WI. Applications involve (i) testing consistency approximations shown in example a self-consistent Born...

Within quantum molecular dynamics (QMD) simulations we demonstrate the effect of virial corrections on heavy ion reactions. Unlike in standard codes, binary collisions are treated as nonlocal so that contribution collision flux to reaction is covered. A comparison with QMD shows lead a broader proton distribution bringing theoretical spectra closer towards experimental values. Complementary Boltzmann-Uehling-Uhlenbeck reveal nonlocality enhances rate early stage reaction. It suggests appears...

Study of transients in the electron quantum transport by nonequilibrium Green's function often requires an explicit inclusion correlations at a finite initial time. For processes embedded host process, universal treatment correlated conditions based on formalism partitioning time allows to express their self-energy including ``irregular'' correlation part terms known properties process. This unified also yields renormalized semigroup property for propagators and reconstruction equations...

The equations for the Non-Equilibrium Green's Functions (NEGF) describing electron transport through molecular bridges are commonly reduced to a Generalized Master Equation (GME) one-electron density matrix using Kadanoff-Baym Ansatz (GKBA). This works weak tunneling and flat functions combined. For structure, whose have complex sd spectral moderately strong, we derive an improved GME novel "corrected GKBA" incorporating stationary approximation vertex part of exact reconstruction free term...

The Non‐Equilibrium Fluctuation‐Dissipation Theorem (NE FDT) is formulated within the Green Function (NEGF) formalism. relation of this theorem to a simplified kinetic theory non‐equilibrium dynamics electrons in open quantum systems discussed. possibility such description first discussed on molecular bridge model represented by calculations transient magnetic currents between two ferromagnetic electrodes linked tunneling junctions size island an Anderson local center type. This can be...

For a set of realistic nucleon-nucleon potentials we evaluate microscopic parameters binary collisions: time duration the scattering state, mean distance, and rotation nucleons during collision. These enter kinetic equation as noninstantaneous nonlocal corrections integral, i.e., they can be experimentally tested. Being proportional to off-shell derivatives T matrix, make it possible compare behavior different in vicinity energy shell. The Bonn one-boson-exchange Paris are found yield very...

In a nonequilibrium system, quasiparticles are defined, consistently with the construction of quantum transport equations, as one-electron excitations whose propagator possesses time-local optical potential. This potential is constructed solution phase equation, self-consistency condition reducing renormalized Dyson equation to formerly proposed multiplicative composition rule for propagators. The particle correlation function transformed quasiparticle reconstruction leading term represents...

The kinetic theory recently implemented in heavy ion reactions combines a nonlocal and noninstantaneous picture of binary collisions with quasiparticle features. We show that the description is compatible spectral concept quasiparticles while commonly used variational consistent only instantaneous collisions. rearrangement energy, by which surpasses one, shown to be covered medium effect on

For a system of non-interacting electrons scattered by neutral impurities, we derive modified Boltzmann equation that includes quasiparticle and virial corrections. We start from quasiclassical transport for non-equilibrium Green's functions apply limit small scattering rates. Resulting quasiparticles has gradient corrections to integrals. These are rearranged into form characteristic

The subject of this paper is the long‐lasting controversy on relativistic transformation temperature, generally known as Planck‐Ott imbroglio. Various, mostly unsuccessful, attempts to solve demanding problem using a combinations tools classical thermodynamics, rules special theory relativity, black‐body radiation and kinetic theory, are reviewed. Using phenomenological analysis, we demonstrate that failure these existence imbroglio itself most likely due misunderstanding physical meaning...