115 research outputs found
Matrix Model and Stationary Problem in Toda Chain
We analyze the stationary problem for the Toda chain, and show that arising
geometric data exactly correspond to the multi-support solutions of one-matrix
model with a polynomial potential. For the first nontrivial examples the
Hamiltonians and symplectic forms are calculated explicitly, and the
consistency checks are performed. The corresponding quantum problem is
formulated and some its properties and perspectives are discussed.Comment: 11 pages, LaTeX; Based on talks at "Classical and quantum integrable
systems", Dubna, January 2005 and "Selected topics of modern mathematical
physics", St.Petersburg, June 2005, and a lecture for the minicourse: "Toda
lattices: basics and perspectives", Fields Institute, Toronto, April 200
Integrable Structure of the Dirichlet Boundary Problem in Multiply-Connected Domains
We study the integrable structure of the Dirichlet boundary problem in two
dimensions and extend the approach to the case of planar multiply-connected
domains. The solution to the Dirichlet boundary problem in multiply-connected
case is given through a quasiclassical tau-function, which generalizes the
tau-function of the dispersionless Toda hierarchy. It is shown to obey an
infinite hierarchy of Hirota-like equations which directly follow from
properties of the Dirichlet Green function and from the Fay identities. The
relation to multi-support solutions of matrix models is briefly discussed.Comment: 41 pages, 5 figures, LaTeX; some revision of exposition, misprints
corrected, the version to appear in Commun. Math. Phy
Period Integrals, Quantum Numbers and Confinement in SUSY QCD
We present a direct computation of the period integrals on degenerate
Seiberg-Witten curves for supersymmetric QCD, and show how these periods
determine the changes in the quantum numbers of the states, when passing from
the weak to the strong-coupling domains in the mass moduli space of the theory.
The confinement of monopoles at strong coupling is discussed, and we
demonstrate that the ambiguities in choosing the way in the moduli space do not
influence to the physical conclusions on confinement of monopoles in the phase
with the condensed light dyons.Comment: 16 pages, contribution to special volume on Integrable Systems in
Quantum Theor
On Microscopic Origin of Integrability in Seiberg-Witten Theory
We discuss microscopic origin of integrability in Seiberg-Witten theory,
following mostly the results of hep-th/0612019, as well as present their
certain extension and consider several explicit examples. In particular, we
discuss in more detail the theory with the only switched on higher perturbation
in the ultraviolet, where extra explicit formulas are obtained using
bosonization and elliptic uniformization of the spectral curve.Comment: 24 pages, 1 figure, LaTeX, based on the talks at 'Geometry and
Integrability in Mathematical Physics', Moscow, May 2006; 'Quarks-2006',
Repino, May 2006; Twente conference on Lie groups, December 2006 and
'Classical and Quantum Integrable Models', Dubna, January 200
Matrix Models, Complex Geometry and Integrable Systems. II
We consider certain examples of applications of the general methods, based on
geometry and integrability of matrix models, described in hep-th/0601212. In
particular, the nonlinear differential equations, satisfied by quasiclassical
tau-functions are investigated. We also discuss a similar quasiclassical
geometric picture, arising in the context of multidimensional supersymmetric
gauge theories and the AdS/CFT correspondence.Comment: 44 pages, 10 figures, based on several lecture courses and the talks
at "Complex geometry and string theory" and the Polivanov memorial seminar;
misprints corrected, references adde
Extended Seiberg-Witten Theory and Integrable Hierarchy
The prepotential of the effective N=2 super-Yang-Mills theory perturbed in
the ultraviolet by the descendents of the single-trace chiral operators is
shown to be a particular tau-function of the quasiclassical Toda hierarchy. In
the case of noncommutative U(1) theory (or U(N) theory with 2N-2 fundamental
hypermultiplets at the appropriate locus of the moduli space of vacua) or a
theory on a single fractional D3 brane at the ADE singularity the hierarchy is
the dispersionless Toda chain. We present its explicit solutions. Our results
generalize the limit shape analysis of Logan-Schepp and Vershik-Kerov, support
the prior work hep-th/0302191 which established the equivalence of these N=2
theories with the topological A string on CP^1 and clarify the origin of the
Eguchi-Yang matrix integral. In the higher rank case we find an appropriate
variant of the quasiclassical tau-function, show how the Seiberg-Witten curve
is deformed by Toda flows, and fix the contact term ambiguity.Comment: 49 page
On some algebraic examples of Frobenius manifolds
We construct some explicit quasihomogeneous algebraic solutions to the
associativity (WDVV) equations by using analytical methods of the finite gap
integration theory. These solutions are expanded in the uniform way to
non-semisimple Frobenius manifolds.Comment: 14 page
Estimating the First-year Corrosion Losses of Structural Metals for Continental Regions of the World
The knowledge of the first-year corrosion losses of metals (K1) in various regions of the world is of great importance in engineering applications. The K1 values are used to determine the categories of atmospheric corrosivity, and K1 is also the main parameter in models for the prediction of long-term corrosion losses of metals. In the absence of experimental values of K1, their values can be predicted on the basis of meteorological and aerochemical parameters of the atmosphere using the dose-response functions (DRF). Currently, the DRFs presented in ISO 9223:2012(E) /1/ standard are used for predicting K1 in any region of the world, along with the unified DRFs /2/ and the new DRFs /3/. The predicted values of corrosion losses (K1pr) of carbon steel, zinc, copper and aluminum obtained by various DRFs for various continental regions of the world are presented. In this work we used the atmosphere corrosivity parameters and experimental data on the corrosion losses of metals for the first year of exposure (K1exp) for the locations of the tests performed under the international UN/ECE program, the MICAT project, and the Russian program. For the first time, a comparative assessment of the reliability of various DRFs is given by comparing the values of K1pr and K1ex using graphical and statistical methods. The statistical indicators of reliability of predicting the corrosion losses of metals are calculated for various categories of atmosphere corrosivity. It is shown that the new dose-response functions offer the highest reliability for all categories of atmosphere corrosivity
Matrix Models, Complex Geometry and Integrable Systems. I
We consider the simplest gauge theories given by one- and two- matrix
integrals and concentrate on their stringy and geometric properties. We remind
general integrable structure behind the matrix integrals and turn to the
geometric properties of planar matrix models, demonstrating that they are
universally described in terms of integrable systems directly related to the
theory of complex curves. We study the main ingredients of this geometric
picture, suggesting that it can be generalized beyond one complex dimension,
and formulate them in terms of the quasiclassical integrable systems, solved by
construction of tau-functions or prepotentials. The complex curves and
tau-functions of one- and two- matrix models are discussed in detail.Comment: 52 pages, 19 figures, based on several lecture courses and the talks
at "Complex geometry and string theory" and the Polivanov memorial seminar;
misprints corrected, references adde
Pseudoclassical description of scalar particle in non-Abelian background and path-integral representations
Path-integral representations for a scalar particle propagator in non-Abelian
external backgrounds are derived. To this aim, we generalize the procedure
proposed by Gitman and Schvartsman 1993 of path-integral construction to any
representation of SU(N) given in terms of antisymmetric generators. And for
arbitrary representations of SU(N), we present an alternative construction by
means of fermionic coherent states. From the path-integral representations we
derive pseudoclassical actions for a scalar particle placed in non-Abelian
backgrounds. These actions are classically analyzed and then quantized to prove
their consistency
- …