51 citations · 149 across the 10 of their papers we have counts for
10 papers
versus Graviphoton
Ahmad Zein Assi
I study the deformation of the topological string by , the complex conjugate of the -deformation. Namely, I identify in terms of a physical state in the string sp…
The Decoupling of in String Theory
K. S. Narain, A. Zein Assi
In this note, we study the deformation of the topological string by . Namely, adopting the perturbative string amplitudes approach, we identify the -deformation in te…
Instanton Corrections for m and Omega
Micha Moskovic, Ahmad Zein Assi
In this paper, we study instanton corrections in the N=2* gauge theory by using its description in string theory as a freely-acting orbifold. The latter is used to compute, using t…
from Topological Amplitudes in String Theory
Ioannis Florakis, Ahmad Zein Assi
In this paper, we explicitly construct string theory backgrounds that realise the so-called gauge theory. We prove the consistency of our models by calculating…
Probing the Moduli Dependence of Refined Topological Amplitudes
Ignatios Antoniadis, Ioannis Florakis, Stefan Hohenegger +2
With the aim of providing a worldsheet description of the refined topological string, we continue the study of a particular class of higher derivative couplings in the ty…
N=2 string amplitudes and the Omega background
Ioannis Florakis, Ahmad Zein Assi
We review recent work [1, 2] on obtaining a realisation of the -background in terms of a special series of higher-derivative generalised F-terms in the effective …
Topological Amplitudes and the String Effective Action
Ahmad Zein Assi
In this work, we study a class of higher derivative couplings in the string effective action arising at the junction of topological string theory and supersymmetric gauge theories…
Non-Perturbative Nekrasov Partition Function from String Theory
Ignatios Antoniadis, Ioannis Florakis, Stefan Hohenegger +2
We calculate gauge instanton corrections to a class of higher derivative string effective couplings introduced in [1]. We work in Type I string theory compactified on K3xT2 and rea…
Worldsheet Realization of the Refined Topological String
I. Antoniadis, I. Florakis, S. Hohenegger +2
A worldsheet realization of the refined topological string is proposed in terms of physical string amplitudes that compute generalized N=2 F-terms of the form F_{g,n} W^{2g}Y^{2n}…
N=4 Topological Amplitudes and String Effective Action
I. Antoniadis, S. Hohenegger, K. S. Narain
Certain scattering amplitudes in the gravitational sector of type II string theory on K3 x T^2 are found to be computed by correlation functions of the N=4 topological string. This…