Nonequilibrium dual-boson approach

Dual boson approach to collective excitations in correlated fermionic systems

We develop a general theory of a boson decomposition for both local and non-local interactions in lattice fermion models which allows us to describe fermionic degrees of freedom and collective charge and spin excitations on equal footing. An efficient perturbation theory in the interaction of the fermionic and the bosonic degrees of freedom is constructed in so-called dual variables in the path...

Nonequilibrium Temperature for Open Boson and Fermion Systems

The effective theory of an open boson or fermion system is studied, which evolves out of equilibrium with a time-dependent Hamiltonian Ĥ(t). A measure of nonequilibrium temperature for the open system evolving from an equilibrium is proposed as the time-averaged energy expectation value T (t) = Ti(〈Ĥ(t)〉Ψ/〈Î(t)〉Ψ), where Î(t), the action operator, satisfies the quantum Liouville-von Neumann equ...

Self–consistent Dual Boson approach to single-particle and collective excitations in correlated systems

Beyond extended dynamical mean-field theory: Dual boson approach to the two-dimensional extended Hubbard model

Dual Spacization Approach to the Electronic Publishing

Dual spacization of publishing means emergence of digital publishing in online and offline virtual environments along with analogue publishing. Analogue publishing is a kind of publishing that is produced in the form of physical printed writings as they appear in a single paper, single or many pages newspapers and magazines and books, writings on leaves and pieces of trees, natural skin and lea...