1,292 research outputs found
Divergences of Discrete States Amplitudes and Effective Lagrangian in 2D String Theory
Scattering amplitudes for discrete states in 2D string theory are considered.
Pole divergences of tree-level amplitudes are extracted and residues are
interpreted as renormalized amplitudes for discrete states. An effective
Lagrangian generating renormalized amplitudes for open string is written and
corresponding Ward identities are presented. A relation of this Lagrangian with
homotopy Lie algebra is discussed
-point amplitudes for d=2 c=1 Discrete States from String Field Theory
Starting from string field theory for 2d gravity coupled to c=1 matter we
analyze N-point off-shell tree amplitudes of discrete states. The amplitudes
exhibit the pole structure and we use the oscillator representation to extract
the residues. The residues are generated by a simple effective action. We show
that the effective action can be directly deduced from a string field action in
a special transversal-like gauge.Comment: 12 pages, latex, 1 figur
Application of Protein Membranes with Magnetic Nanoparticles for Co-Cultivation of Cell Cultures by Levitation in a Magnetic Field
Financial support was received from Ural Center for Modern Nanotechnologies of the Ural Federal University (UCMN, Yekaterinburg, Russia). This work was supported by the Russian Foundation for Basic Research, project 19-74-00081
Non-equilibrium statistical mechanics of classical nuclei interacting with the quantum electron gas
Kinetic equations governing time evolution of positions and momenta of atoms
in extended systems are derived using quantum-classical ensembles within the
Non-Equilibrium Statistical Operator Method (NESOM). Ions are treated
classically, while their electrons quantum mechanically; however, the
statistical operator is not factorised in any way and no simplifying
assumptions are made concerning the electronic subsystem. Using this method, we
derive kinetic equations of motion for the classical degrees of freedom (atoms)
which account fully for the interaction and energy exchange with the quantum
variables (electrons). Our equations, alongside the usual Newtonian-like terms
normally associated with the Ehrenfest dynamics, contain additional terms,
proportional to the atoms velocities, which can be associated with the
electronic friction. Possible ways of calculating the friction forces which are
shown to be given via complicated non-equilibrium correlation functions, are
discussed. In particular, we demonstrate that the correlation functions are
directly related to the thermodynamic Matsubara Green's functions, and this
relationship allows for the diagrammatic methods to be used in treating
electron-electron interaction perturbatively when calculating the correlation
functions. This work also generalises previous attempts, mostly based on model
systems, of introducing the electronic friction into Molecular Dynamics
equations of atoms.Comment: 18 page
The Using of Electron Microscopy in the Diagnosis of Amphibian Pathologies
Studying of amphibian tissues and cells by modern microscopy methods can reconstruct functional background of organs and systems patholody
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