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Dive into the research topics where Niclas Wyllard is active.

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Featured researches published by Niclas Wyllard.


Journal of High Energy Physics | 2010

A& B model approaches to surface operators and Toda thoeries

Can Kozcaz; Sara Pasquetti; Niclas Wyllard

It has recently been argued [1] that the inclusion of surface operators in 4d


Journal of High Energy Physics | 2011

Affine sl(N)conformal blocks from \( \mathcal{N} = 2 \) SU(N) gauge theories

Can Kozcaz; Sara Pasquetti; Filippo Passerini; Niclas Wyllard

\mathcal{N} = 2


Journal of High Energy Physics | 2004

A Note on instanton counting for N=2 gauge theories with classical gauge groups

Marcos Marino; Niclas Wyllard

SU(2) quiver gauge theories should correspond to insertions of certain degenerate operators in the dual Liouville theory. So far only the insertion of a single surface operator has been treated (in a semi-classical limit). In this paper we study and generalise this proposal. Our approach relies on the use of topological string theory techniques. On the B-model side we show that the effects of multiple surface operator insertions in 4d


arXiv: High Energy Physics - Theory | 2010

W-algebras and surface operators in N=2 gauge theories

Niclas Wyllard

\mathcal{N} = 2


Journal of High Energy Physics | 2005

Lower-dimensional pure-spinor superstrings

Pietro Antonio Grassi; Niclas Wyllard

gauge theories can be calculated using the B-model topological recursion method, valid beyond the semi-classical limit. On the mirror A-model side we find by explicit computations that the 5d lift of the SU(N) gauge theory partition function in the presence of (one or many) surface operators is equal to an A-model topological string partition function with the insertion of (one or many) toric branes. This is in agreement with an earlier proposal by Gukov [2, 2, 3]. Our A-model results were motivated by and agree with what one obtains by combining the AGT conjecture with the dual interpretation in terms of degenerate operators. The topological string theory approach also opens up new possibilities in the study of 2d Toda field theories.


Journal of High Energy Physics | 2005

D-brane boundary states in the pure spinor superstring

Ricardo Schiappa; Niclas Wyllard

Recently Alday and Tachikawa [1] proposed a relation between conformal blocks in a two-dimensional theory with affine sl(2) symmetry and instanton partition functions in four-dimensional conformal


Journal of High Energy Physics | 2005

Pure-spinor superstrings in d = 2,4,6

Niclas Wyllard

\mathcal{N} = 2


arXiv: High Energy Physics - Theory | 2004

MATRIX MODELS AND

S. G. Naculich; Howard J. Schnitzer; Niclas Wyllard

SU(2) quiver gauge theories in the presence of a certain surface operator. In this paper we extend this proposal to a relation between conformal blocks in theories with affine sl(N) symmetry and instanton partition functions in conformal


arXiv: High Energy Physics - Theory | 2000

{\mathcal N} = 2

Anders Westerberg; Niclas Wyllard

\mathcal{N} = 2


arXiv: High Energy Physics - Theory | 2011

GAUGE THEORY

Niclas Wyllard

SU(N) quiver gauge theories in the presence of a surface operator. We also discuss the extension to non-conformal

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Can Kozcaz

University of Washington

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Can Kozcaz

University of Washington

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Ricardo Schiappa

Instituto Superior Técnico

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Filippo Passerini

Perimeter Institute for Theoretical Physics

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Filippo Passerini

Perimeter Institute for Theoretical Physics

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