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Search Results: 1 - 10 of 15 matches for " Pestun "
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N=4 super Yang-Mills matrix integrals for almost all simple gauge groups
Vasily Pestun
Physics , 2002, DOI: 10.1088/1126-6708/2002/09/012
Abstract: In this paper the partition function of N=4 D=0 super Yang-Mills matrix theory with arbitrary simple gauge group is discussed. We explicitly computed its value for all classical groups of rank up to 11 and for the exceptional groups G_2, F_4 and E_6. In the case of classical groups of arbitrary rank we conjecture general formulas for the B_r, C_r and D_r series in addition to the known result for the A_r series. Also, the relevant boundary term contributing to the Witten index of the corresponding supersymmetric quantum mechanics has been explicitly computed as a simple function of rank for the orthogonal and symplectic groups SO(2N+1), Sp(2N), SO(2N).
On non-abelian low energy effective action for D-branes
Vasily Pestun
Physics , 2001, DOI: 10.1088/1126-6708/2001/11/017
Abstract: Connection between the partition function for the 2D sigma model with boundary pertubations and the low energy effective action for massless fields from in the open string theory is discussed. In the non-abelian case with a stack of $N$ D-branes, the terms up to the order of $\alpha'^3$ are found
Topological strings in generalized complex space
Vasily Pestun
Mathematics , 2006,
Abstract: A two-dimensional topological sigma-model on a generalized Calabi-Yau target space $X$ is defined. The model is constructed in Batalin-Vilkovisky formalism using only a generalized complex structure $J$ and a pure spinor $\rho$ on $X$. In the present construction the algebra of $Q$-transformations automatically closes off-shell, the model transparently depends only on $J$, the algebra of observables and correlation functions for topologically trivial maps in genus zero are easily defined. The extended moduli space appears naturally. The familiar action of the twisted N=2 CFT can be recovered after a gauge fixing. In the open case, we consider an example of generalized deformation of complex structure by a holomorphic Poisson bivector $\beta$ and recover holomorphic noncommutative Kontsevich $*$-product.
Localization of gauge theory on a four-sphere and supersymmetric Wilson loops
Vasily Pestun
Mathematics , 2007, DOI: 10.1007/s00220-012-1485-0
Abstract: We prove conjecture due to Erickson-Semenoff-Zarembo and Drukker-Gross which relates supersymmetric circular Wilson loop operators in the N=4 supersymmetric Yang-Mills theory with a Gaussian matrix model. We also compute the partition function and give a new matrix model formula for the expectation value of a supersymmetric circular Wilson loop operator for the pure N=2 and the N=2* supersymmetric Yang-Mills theory on a four-sphere. A four-dimensional N=2 superconformal gauge theory is treated similarly.
Consciência fonológica no início da escolariza??o e o desempenho ulterior em leitura e escrita: estudo correlacional
Pestun, Magda Solange Vanzo;
Estudos de Psicologia (Natal) , 2005, DOI: 10.1590/S1413-294X2005000300009
Abstract: contemporary research has demonstrated that metalinguistic skills are fundamental for the acquisition and development of reading and writing skills. with the purpose of verifying if children who had not attended school before preschool iii, with no knowledge of reading and spelling, presented phonological awareness when entering formal schooling and if the presence of this skill favored reading and writing acquisition, 167 children from both sexes with an average age of 5 years and 8 months old, similar social-economical level, took part in this study which was carried out in three stages. in the first stage (beginning of preschool iii), the phonological awareness skill was evaluated by means of the phonological awareness test. in the second and third stages (beginning and ending of the first grade of the elementary school), the children were reassessed in their phonological awareness and evaluated in oral reading and writing with dictation of words and pseudowords. the results showed a positive correlation between phonological awareness and ulterior performance in reading as well as in writing.
On the property of Cachazo-Intriligator-Vafa prepotential at the extremum of the superpotential
A. Dymarsky,V. Pestun
Physics , 2003, DOI: 10.1103/PhysRevD.67.125001
Abstract: We consider CIV-DV prepotential F for N=1 SU(n) SYM theory at the extremum of the effective superpotential and prove the relation $2F-S dF/dS = - 2 u_2 Lambda^2n /(n^2-1)$
Comparing strings in AdS(5)xS(5) to planar diagrams: an example
V. Pestun,K. Zarembo
Physics , 2002, DOI: 10.1103/PhysRevD.67.086007
Abstract: The correlator of a Wilson loop with a local operator in N=4 SYM theory can be represented by a string amplitude in AdS(5)xS(5). This amplitude describes an overlap of the boundary state, which is associated with the loop, with the string mode, which is dual to the local operator. For chiral primary operators with a large R charge, the amplitude can be calculated by semiclassical techniques. We compare the semiclassical string amplitude to the SYM perturbation theory and find an exact agrement to the first two non-vanishing orders.
Seiberg-Witten geometry of four dimensional N=2 quiver gauge theories
Nikita Nekrasov,Vasily Pestun
Mathematics , 2012,
Abstract: Seiberg-Witten geometry of mass deformed N=2 superconformal ADE quiver gauge theories in four dimensions is determined. We solve the limit shape equations derived from the gauge theory and identify the space M of vacua of the theory with the moduli space of the genus zero holomorphic (quasi)maps to the moduli space of holomorphic G-bundles on a (possibly degenerate) elliptic curve defined in terms of the microscopic gauge couplings, for the corresponding simple ADE Lie group G. The integrable systems underlying, or, rather, overlooking the special geometry of M are identified. The moduli spaces of framed G-instantons on R^2xT^2, of G-monopoles with singularities on R^2xS^1, the Hitchin systems on curves with punctures, as well as various spin chains play an important role in our story. We also comment on the higher dimensional theories. In the companion paper the quantum integrable systems and their connections to the representation theory of quantum affine algebras will be discussed
The Hitchin functionals and the topological B-model at one loop
Vasily Pestun,Edward Witten
Mathematics , 2005, DOI: 10.1007/s11005-005-0007-9
Abstract: The quantization in quadratic order of the Hitchin functional, which defines by critical points a Calabi-Yau structure on a six-dimensional manifold, is performed. The conjectured relation between the topological B-model and the Hitchin functional is studied at one loop. It is found that the genus one free energy of the topological B-model disagrees with the one-loop free energy of the minimal Hitchin functional. However, the topological B-model does agree at one-loop order with the extended Hitchin functional, which also defines by critical points a generalized Calabi-Yau structure. The dependence of the one-loop result on a background metric is studied, and a gravitational anomaly is found for both the B-model and the extended Hitchin model. The anomaly reduces to a volume-dependent factor if one computes for only Ricci-flat Kahler metrics.
Quantum geometry and quiver gauge theories
Nikita Nekrasov,Vasily Pestun,Samson Shatashvili
Mathematics , 2013,
Abstract: We study macroscopically two dimensional $\mathcal{N}=(2,2)$ supersymmetric gauge theories constructed by compactifying the quiver gauge theories with eight supercharges on a product $\mathbb{T}^{d} \times \mathbb{R}^{2}_{\epsilon}$ of a $d$-dimensional torus and a two dimensional cigar with $\Omega$-deformation. We compute the universal part of the effective twisted superpotential. In doing so we establish the correspondence between the gauge theories, quantization of the moduli spaces of instantons on $\mathbb{R}^{2-d} \times \mathbb{T}^{2+d}$ and singular monopoles on $\mathbb{R}^{2-d} \times \mathbb{T}^{1+d}$, for $d=0,1,2$, and the Yangian $\mathbf{Y}_{\epsilon}(\mathfrak{g}_{\Gamma})$, quantum affine algebra $\mathbf{U}^{\mathrm{aff}}_q(\mathfrak{g}_{\Gamma})$, or the quantum elliptic algebra $\mathbf{U}^{\mathrm{ell}}_{q,p}(\mathfrak{g}_{\Gamma})$ associated to Kac-Moody algebra $\mathfrak{g}_{\Gamma}$ for quiver $\Gamma$.
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