812 research outputs found
Hilbert Schemes, Separated Variables, and D-Branes
We explain Sklyanin's separation of variables in geometrical terms and
construct it for Hitchin and Mukai integrable systems. We construct Hilbert
schemes of points on for \Sigma = {\IC}, {\IC}^{*} or elliptic
curve, and on and show that their complex deformations
are integrable systems of Calogero-Sutherland-Moser type. We present the
hyperk\"ahler quotient constructions for Hilbert schemes of points on cotangent
bundles to the higher genus curves, utilizing the results of Hurtubise,
Kronheimer and Nakajima. Finally we discuss the connections to physics of
-branes and string duality.Comment: harvmac, 27 pp. big mode; v2. typos and references correcte
Duality in Integrable Systems and Gauge Theories
We discuss various dualities, relating integrable systems and show that these
dualities are explained in the framework of Hamiltonian and Poisson reductions.
The dualities we study shed some light on the known integrable systems as well
as allow to construct new ones, double elliptic among them. We also discuss
applications to the (supersymmetric) gauge theories in various dimensions.Comment: harvmac 45 pp.; v4. minor corrections, to appear in JHE
Monte Carlo simulations of the classical two-dimensional discrete frustrated model
The classical two-dimensional discrete frustrated model is studied
by Monte Carlo simulations. The correlation function is obtained for two values
of a parameter that determines the frustration in the model. The ground
state is a ferro-phase for and a commensurate phase with period N=6
for . Mean field predicts that at higher temperature the system enters
a para-phase via an incommensurate state, in both cases. Monte Carlo data for
show two phase transitions with a floating-incommensurate phase
between them. The phase transition at higher temperature is of the
Kosterlitz-Thouless type. Analysis of the data for shows only a
single phase transition between the floating-fluid phase and the ferro-phase
within the numerical error.Comment: 5 figures, submitted to the European Physical Journal
Many-body synchronization of interacting qubits by engineered ac-driving
In this work we introduce the many-body synchronization of an interacting
qubit ensemble which allows one to switch dynamically from many-body-localized
(MBL) to an ergodic state. We show that applying of -pulses with altering
phases, one can effectively suppress the MBL phase and, hence, eliminate qubits
disorder. The findings are based on the analysis of the Loschmidt echo dynamics
which shows a transition from a power-law decay to more rapid one indicating
the dynamical MBL-to-ergodic transition. The technique does not require to know
the microscopic details of the disorder.Comment: 5 pages, 4 figure
On the spatial structure of the Perseids meteor stream
The analysis of radar observations of the Perseid meteor stream conducted in an ionospherical laboratory in the period from 1964 to 1981 is presented. The Perseids meteor rates were determined by the fluctuation method. Analysis of their hourly distributions showed that the stream maximum position is different for different years, i.e., the stream nodal position is constantly changing. The results of the analysis are presented and discussed
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