17 research outputs found
Solitons and Normal Random Matrices
We discuss a general relation between the solitons and statistical mechanics
and show that the partition function of the normal random matrix model can be
obtained from the multi-soliton solutions of the two-dimensional Toda lattice
hierarchy in a special limit
Constrained Reductions of 2D dispersionless Toda Hierarchy, Hamiltonian Structure and Interface Dynamics
Finite-dimensional reductions of the 2D dispersionless Toda hierarchy,
constrained by the ``string equation'' are studied. These include solutions
determined by polynomial, rational or logarithmic functions, which are of
interest in relation to the ``Laplacian growth'' problem governing interface
dynamics. The consistency of such reductions is proved, and the Hamiltonian
structure of the reduced dynamics is derived. The Poisson structure of the
rationally reduced dispersionless Toda hierarchies is also derivedComment: 18 pages LaTex, accepted to J.Math.Phys, Significantly updated
version of the previous submissio
SLE_k: correlation functions in the coefficient problem
We apply the method of correlation functions to the coefficient problem in
stochastic geometry. In particular, we give a proof for some universal patterns
conjectured by M. Zinsmeister for the second moments of the Taylor coefficients
for special values of kappa in the whole-plane Schramm-Loewner evolution
(SLE_kappa). We propose to use multi-point correlation functions for the study
of higher moments in coefficient problem. Generalizations related to the
Levy-type processes are also considered. The exact multifractal spectrum of
considered version of the whole-plane SLE_kappa is discussed
Exceptional Askey-Wilson type polynomials through Darboux-Crum transformations
An alternative derivation is presented of the infinitely many exceptional
Wilson and Askey-Wilson polynomials, which were introduced by the present
authors in 2009. Darboux-Crum transformations intertwining the discrete quantum
mechanical systems of the original and the exceptional polynomials play an
important role. Infinitely many continuous Hahn polynomials are derived in the
same manner. The present method provides a simple proof of the shape invariance
of these systems as in the corresponding cases of the exceptional Laguerre and
Jacobi polynomials.Comment: 24 pages. Comments and references added. To appear in J.Phys.
The formation of human populations in South and Central Asia
By sequencing 523 ancient humans, we show that the primary source of ancestry in modern South Asians is a prehistoric genetic gradient between people related to early hunter-gatherers of Iran and Southeast Asia. After the Indus Valley Civilization’s decline, its people mixed with individuals in the southeast to form one of the two main ancestral populations of South Asia, whose direct descendants live in southern India. Simultaneously, they mixed with descendants of Steppe pastoralists who, starting around 4000 years ago, spread via Central Asia to form the other main ancestral population. The Steppe ancestry in South Asia has the same profile as that in Bronze Age Eastern Europe, tracking a movement of people that affected both regions and that likely spread the distinctive features shared between Indo-Iranian and Balto-Slavic languages
Olmesartan: vasoprotective effects and reducing the risk of vascular accidents
Currently, arterial hypertension (AH) and atherosclerosis are the most significant risk factors for cerebral complications including ischemic stroke, which requires adequate therapeutic interventions for primary and secondary prevention [1]