N=2 Instanton Calculus In Closed String Background
arXiv:0707.2298 · doi:10.1143/PTPS.171.279
Abstract
In this contribution we describe how to obtain instanton effects in four dimensional gauge theories by computing string scattering amplitudes in D3/D(-1) brane systems. In particular we study a system of fractional D3/D(-1) branes in a Z_2 orbifold and in a Ramond-Ramond closed string background, and show that it describes the gauge instantons of N=2 super Yang-Mills theory and their interactions with the graviphoton of N=2. Using string theory methods we compute the prepotential of the effective gauge theory exploiting the localization methods of the instanton calculus, showing that this leads to the same information given by the topological string.
12 pages, 2 figures; to appear in the proceedings of 21st Nishinomiya-Yukawa Memorial Symposium on Theoretical Physics: Noncommutative Geometry and Quantum Spacetime in Physics, Nishinomiya and Kyoto, Japan, 11-15 Nov 2006
References in corpus (10)
- Spacetime Instanton Corrections in 4D String Vacua - The Seesaw Mechanism for D-Brane Models
- Stringy Instantons and Quiver Gauge Theories
- Stringy Instantons at Orbifold Singularities
- Small Instantons, Little Strings and Free Fermions
- Computation of D-brane instanton induced superpotential couplings - Majorana masses from string theory
- D-brane Instantons on the T^6/Z_3 orientifold
- Seiberg-Witten Theory and Random Partitions
- Non-perturbative and Flux superpotentials for Type I strings on the Z_3 orbifold
- Seiberg-Witten prepotential from instanton counting
- Instantons and Supersymmetry