258 research outputs found
Shear coordinate description of the quantised versal unfolding of D_4 singularity
In this paper by using Teichmuller theory of a sphere with four
holes/orbifold points, we obtain a system of flat coordinates on the general
affine cubic surface having a D_4 singularity at the origin. We show that the
Goldman bracket on the geodesic functions on the four-holed/orbifold sphere
coincides with the Etingof-Ginzburg Poisson bracket on the affine D_4 cubic. We
prove that this bracket is the image under the Riemann-Hilbert map of the
Poisson Lie bracket on the direct sum of three copies of sl_2. We realise the
action of the mapping class group by the action of the braid group on the
geodesic functions . This action coincides with the procedure of analytic
continuation of solutions of the sixth Painlev\'e equation. Finally, we produce
the explicit quantisation of the Goldman bracket on the geodesic functions on
the four-holed/orbifold sphere and of the braid group action.Comment: 14 pages, 2 picture
Extension of geodesic algebras to continuous genus
Using the Penner--Fock parameterization for Teichmuller spaces of Riemann
surfaces with holes, we construct the string-like free-field representation of
the Poisson and quantum algebras of geodesic functions in the continuous-genus
limit. The mapping class group acts naturally in the obtained representation.Comment: 16 pages, submitted to Lett.Math.Phy
Quantum Teichmuller theory and representations of the pure braid group
We adapt some of the methods of quantum Teichm\"uller theory to construct a
family of representations of the pure braid group of the sphere.Comment: 15 pages. Several typos corrected. To appear in Communications in
Contemporary Mathematic
Topological expansion of beta-ensemble model and quantum algebraic geometry in the sectorwise approach
We solve the loop equations of the -ensemble model analogously to the
solution found for the Hermitian matrices . For \beta=1y^2=U(x)\beta((\hbar\partial)^2-U(x))\psi(x)=0\hbar\propto
(\sqrt\beta-1/\sqrt\beta)/Ny^2-U(x)[y,x]=\hbarF_h-expansion at arbitrary . The set of "flat"
coordinates comprises the potential times and the occupation numbers
\widetilde{\epsilon}_\alpha\mathcal F_0\widetilde{\epsilon}_\alpha$.Comment: 58 pages, 7 figure
A Hint on the External Field Problem for Matrix Models
We reexamine the external field problem for hermitian one-matrix models. We prove an equivalence of the models with the potentials \tr{({1/over2N}X^2 + \log X - \Lambda X)} and \sum_{k=1}^\infty t_k\tr{X^k} providing the matrix is related to by t_k=\fr 1k \tr{\Lambda^{-k}}-\frac N2 \delta_{k2}. Based on this equivalence we formulate a method for calculating the partition function by solving the Schwinger--Dyson equations order by order of genus expansion. Explicit calculations of the partition function and of correlators of conformal operators with the puncture operator are presented in genus one. These results support the conjecture that our models are associated with the case in the same sense as the Kontsevich model describes
Matrix eigenvalue model: Feynman graph technique for all genera
We present the diagrammatic technique for calculating the free energy of the
matrix eigenvalue model (the model with arbitrary power by the
Vandermonde determinant) to all orders of 1/N expansion in the case where the
limiting eigenvalue distribution spans arbitrary (but fixed) number of disjoint
intervals (curves).Comment: Latex, 27 page
A matrix model for the topological string II: The spectral curve and mirror geometry
In a previous paper, we presented a matrix model reproducing the topological
string partition function on an arbitrary given toric Calabi-Yau manifold.
Here, we study the spectral curve of our matrix model and thus derive, upon
imposing certain minimality assumptions on the spectral curve, the large volume
limit of the BKMP "remodeling the B-model" conjecture, the claim that
Gromov-Witten invariants of any toric Calabi-Yau 3-fold coincide with the
spectral invariants of its mirror curve.Comment: 1+37 page
Partition Functions of Matrix Models as the First Special Functions of String Theory. II. Kontsevich Model
In arXiv:hep-th/0310113 we started a program of creating a reference-book on
matrix-model tau-functions, the new generation of special functions, which are
going to play an important role in string theory calculations. The main focus
of that paper was on the one-matrix Hermitian model tau-functions. The present
paper is devoted to a direct counterpart for the Kontsevich and Generalized
Kontsevich Model (GKM) tau-functions. We mostly focus on calculating resolvents
(=loop operator averages) in the Kontsevich model, with a special emphasis on
its simplest (Gaussian) phase, where exists a surprising integral formula, and
the expressions for the resolvents in the genus zero and one are especially
simple (in particular, we generalize the known genus zero result to genus one).
We also discuss various features of generic phases of the Kontsevich model, in
particular, a counterpart of the unambiguous Gaussian solution in the generic
case, the solution called Dijkgraaf-Vafa (DV) solution. Further, we extend the
results to the GKM and, in particular, discuss the p-q duality in terms of
resolvents and corresponding Riemann surfaces in the example of dualities
between (2,3) and (3,2) models.Comment: 48 pages, 2 figure
- …