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V. I. Kuvshinov

Publications and source records attributed to V. I. Kuvshinov.

33 records · Page 2Linked to original sources
arXiv2003

Chaos assisted instanton tunneling in one dimensional perturbed periodic potential

For the system with one-dimensional spatially periodic potential we demonstrate that small periodic in time perturbation results in appearance of chaotic instanton solutions. We estimate parameter of local instability, width of stochastic layer and correlator for perturbed instanton solutions. Application of the instanton technique enables to calculate the amplitude of the tunneling, the form of the spectrum and the lower bound for width of the ground quasienergy zone.

nlin.CD↗
arXiv2003

Coherent Tunneling and Instantons in Presence of Classical Chaos

We consider the instanton approach to the problem of chaos assisted tunneling in the context of existing analytical and numerical results obtained in this field. We provide the estimation for the range of validity of this method and briefly discuss possible applications of chaos assisted tunneling for quantum computations.

nlin.CD↗
arXiv2002

Multiplicity Fluctuation at Second-order Phase Transition in QGP on the Base of Squeezed States

We use the generalized squeezed state description in the framework of the Ginzburg-Landau theory. Multiplicity distributions of the squeezed states are studied at second-order phase transition at different squeeze factors. It is shown that the normalized factorial moments exhibit a specific behaviour as functions of the resolution scale. We obtain the values of the scaling exponent which coincides with experimental data at small squeeze factor.

hep-ph↗
arXiv2002

Quantum field fluctuations and chaotic dynamics of model Yang-Mills system

On example of the model field system we demonstrate that quantum fluctuations of non-abelian gauge fields leading to radiative corrections to Higgs potential and spontaneous symmetry breaking can generate order region in phase space of inherently chaotic classical field system. We demonstrate on the example of another model field system that quantum fluctuations do not influence on the chaotic dynamics of non-abelian Yang--Mills fields if the ratio of bare coupling constants of Yang--Mills and Higgs fields is larger then some critical value. This critical value is estimated.

hep-th↗
arXiv2002

Towards chaos criterion in quantum field theory

Chaos criterion for quantum field theory is proposed. Its correspondence with classical chaos criterion in semi-classical regime is shown. It is demonstrated for real scalar field that proposed chaos criterion can be used to investigate stability of classical solutions of field equations.

hep-th↗
arXiv2002

Non-perturbative gluon evolution, squeezing, correlations and chaos in jets

We study evolution of colour gluon states in isolated QCD jet at the non-perturbative stage. Fluctuations of gluons are less than those for coherent states under specific conditions. This fact suggests that there gluon squeezed states can arise. The angular and rapidity dependencies of the normalized second-order correlation function for present gluon states are studied at this stage of jet evolution. It is shown that these new gluon states can have both sub-Poissonian and super-Poissonian statistics corresponding to, respectively, antibunching and bunching of gluons by analogy with squeezed photon states. We investigate the possibility of coexisting both squeezing and chaos using Toda criterion and temporal correlator analysis. It is shown that these effects may coexist under some conditions.

hep-ph↗
arXiv2001

New Theoretical and Experimental Correlation Aspects of QCD-Instantons in High Energy Collisions

Possibility of experimental identification of QCD-instantons in high energy collisions is studied by means of correlations analysis in final states. Instanton-induced processes amplitudes are performed in the framework of QCD in Gauss approximation. Hadronization is taken into account by Monte-Carlo method. Obtained results can be used as additional criterions of QCD-instanton identification at HERA (DESY). Unlike previous results in this report we consider also nonzero quarks modes contribution into parton distributions of instanton processes.

hep-ph↗
arXiv1996

Multiparticle Clusters and Intermittent Fluctuations

An approach for understanding the behavior of multiplicity distributions in restricted phase-space intervals derived on the basis of global observables is proposed. We obtain a unifying connection between local multiparticle clusters and the scale-invariant power-law behavior of normalized factorial moments. The model can be used to describe multiparticle processes in terms of a decomposition of the observed intermittent signal into contributions from clusters with varying number of particles.

hep-ph↗
arXiv1996

Generalized Bunching Parameters and Multiplicity Fluctuations in Restricted Phase-Space Bins

Experimental aspects of the use of bunching parameters are discussed. Special attention is paid to the behavior expected for the case of purely statistical fluctuations. We studied bin-averaged bunching parameters and propose a generalization of bunching parameters, making use of the interparticle distance-measure technique. The proposed method opens up the possibility of carrying out a comprehensive and sensitive investigation of multiplicity fluctuations inside jets.

hep-ph↗
arXiv1996

Multifractal Multiplicity Distribution in Bunching-Parameter Analysis

A new multiplicity distribution with multifractal properties which can be used in high-energy physics and quantum optics is proposed. It may be considered as a generalization of the negative-binomial distribution. We find the structure of the generating function for such distribution and discuss its properties.

hep-ph↗
arXiv1996

Bunching Parameter and Intermittency in High-Energy Collisions

We introduce the parameter of bunching for an analysis of the intermittent structure of multihadron production in high-energy collisions following an analogy with photon counting in quantum optics. A power-law singularity is shown to exist for second-order bunching parameters in small phase-space intervals for the case of a monofractal structure of the multiplicity distribution and a similar form for the high-order parameters for the case of multifractality. The approximation of the high-order bunching parameters by the second-order provides a good description of the anomalous fractal dimensions for a number of experimental data with multifractal behavior.

hep-ph↗