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 Z2 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.

N=2 instanton calculus in closed string background

BILLO', Marco;FRAU, Marialuisa;
2007

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 Z2 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.
21st Nishinomiya-Yukawa Memorial Symposium On Theoretical Physics: Noncommutative Geometry And Quantum Spacetime In Physics
Nishinomiya e Kyoto (Giappone)
11-15 Novembre 2006
171
279
290
PROGRESS OF THEORETICAL PHYSICS SUPPLEMENT
http://www2.yukawa.kyoto-u.ac.jp/~nys2006/
Instantons; closed strings; graviphoton; non-perturbative effects
Marco Billo'; Marialuisa Frau; Alberto Lerda
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2318/59920
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