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Title:

One-loop and D-instanton corrections to the effective action of open string models

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Year of Publication:

2013-06-26

Source:

http://edoc.ub.uni-muenchen.de/10343/1/Schmidt-Sommerfeld_Maximilian.pdf

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en

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Title:

One-loop and D-instanton corrections to the effective action of open string models

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One-loop corrections to the gauge coupling and the gauge kinetic function in certain classes of four-dimensional D-brane models are computed. It is described how to determine D-instanton corrections to the superpotential and the gauge kinetic function in such models. The Affleck-Dine-Seiberg superpotential is rederived in string theory. The exis...

One-loop corrections to the gauge coupling and the gauge kinetic function in certain classes of four-dimensional D-brane models are computed. It is described how to determine D-instanton corrections to the superpotential and the gauge kinetic function in such models. The Affleck-Dine-Seiberg superpotential is rederived in string theory. The existence of a new class of multi-instantons, dubbed poly-instantons, is conjectured. Minimize

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The Pennsylvania State University CiteSeerX Archives

Year of Publication:

2013-06-26

Source:

http://arxiv.org/pdf/0909.3153v1.pdf

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text

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en

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Title:

D-brane Instantons in 4D Supersymmetric String Vacua

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We review some aspects of D-instantons in intersecting D-brane models. In particular, we present applications of the recently proposed instanton calculus to computations of charged matter superpotential couplings and corrections to the gauge kinetic function in the low energy effective action of type IIA orientifolds. As an interesting byway, we...

We review some aspects of D-instantons in intersecting D-brane models. In particular, we present applications of the recently proposed instanton calculus to computations of charged matter superpotential couplings and corrections to the gauge kinetic function in the low energy effective action of type IIA orientifolds. As an interesting byway, we also discuss how one-loop corrections to the gauge kinetic function can be deduced from gauge threshold corrections in the type IIA setting. Minimize

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The Pennsylvania State University CiteSeerX Archives

Year of Publication:

2013-09-30

Source:

http://arxiv.org/pdf/0712.1793v1.pdf

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text

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en

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MPP-2007-163 Gauge Thresholds and Kähler Metrics for Rigid Intersecting D-brane Models

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The gauge threshold corrections for globally consistent Z2 ×Z ′ 2 orientifolds with rigid intersecting D6-branes are computed. The one-loop corrections to the holomorphic gauge kinetic function as well as the Kähler metrics for

The gauge threshold corrections for globally consistent Z2 ×Z ′ 2 orientifolds with rigid intersecting D6-branes are computed. The one-loop corrections to the holomorphic gauge kinetic function as well as the Kähler metrics for Minimize

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The Pennsylvania State University CiteSeerX Archives

Year of Publication:

2013-08-05

Source:

http://arxiv.org/pdf/0711.0866v1.pdf

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text

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en

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Title:

Power Towers of String Instantons for N=1 Vacua

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We provide arguments for the existence of novel hereinafter called polyinstanton corrections to holomorphic couplings in four-dimensional N=1 supersymmetric string compactifications. After refining quantitatively the D-brane instanton calculus for corrections to the gauge kinetic function, we explicitly apply it to the Type I toroidal orbifold d...

We provide arguments for the existence of novel hereinafter called polyinstanton corrections to holomorphic couplings in four-dimensional N=1 supersymmetric string compactifications. After refining quantitatively the D-brane instanton calculus for corrections to the gauge kinetic function, we explicitly apply it to the Type I toroidal orbifold defined in arXiv:0710.3080 and compare the results to the proposed heterotic S-dual model. This leads us to the intriguing conclusion that N=1 string vacua feature a power tower like proliferation of instanton corrections. Minimize

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The Pennsylvania State University CiteSeerX Archives

Year of Publication:

2013-09-30

Source:

http://arxiv.org/pdf/0803.1562v1.pdf

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text

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en

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MPP-2007-55 LMU-ASC 30/07 Thresholds for Intersecting D-branes Revisited

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Gauge threshold corrections for intersecting D6-brane string models on toroidal orbifold backgrounds are reconsidered. Both by dimensionally regularising the appearing open string one-loop diagrams in tree-channel as well as by zeta-function regularisation of the corresponding loop-channel one-loop diagrams, we arrive at a result which takes int...

Gauge threshold corrections for intersecting D6-brane string models on toroidal orbifold backgrounds are reconsidered. Both by dimensionally regularising the appearing open string one-loop diagrams in tree-channel as well as by zeta-function regularisation of the corresponding loop-channel one-loop diagrams, we arrive at a result which takes into account the infrared divergence from the contribution of the massless states in the running of the gauge coupling constant as well as the contribution of states, which become light in certain regions of the moduli space. Contents Minimize

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The Pennsylvania State University CiteSeerX Archives

Year of Publication:

2012-11-22

Source:

http://arxiv.org/pdf/0705.2150v1.pdf

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text

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en

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A Loop channel calculation and zeta-function regularisation 10

A Loop channel calculation and zeta-function regularisation 10 Minimize

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Title:

Instantons and Holomorphic Couplings in Intersecting D-brane Models

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We clarify certain aspects and discuss extensions of the recently introduced string D-instanton calculus (hep-th/0609191). The one-loop determinants are related to one-loop open string threshold corrections in intersecting D6brane models. Utilising a non-renormalisation theorem for the holomorphic Wilsonian gauge kinetic functions, we derive a n...

We clarify certain aspects and discuss extensions of the recently introduced string D-instanton calculus (hep-th/0609191). The one-loop determinants are related to one-loop open string threshold corrections in intersecting D6brane models. Utilising a non-renormalisation theorem for the holomorphic Wilsonian gauge kinetic functions, we derive a number of constraints for the moduli dependence of the matter field Kähler potentials of intersecting D6-brane models on the torus. Moreover, we compute string one-loop corrections to the Fayet-Iliopoulos terms on the D6-branes finding that they are proportional to the gauge threshold corrections. Employing these results, we discuss the issue of holomorphy for E2-instanton corrections to the superpotential. Eventually, we discuss E2-instanton corrections to the gauge kinetic functions and the FI-terms. Minimize

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The Pennsylvania State University CiteSeerX Archives

Year of Publication:

2013-09-30

Source:

http://arxiv.org/pdf/0705.2366v1.pdf

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text

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en

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Title:

Power Towers of String Instantons for N=1 Vacua

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Description:

We provide arguments for the existence of novel hereinafter called polyinstanton corrections to holomorphic couplings in four-dimensional N=1 supersymmetric string compactifications. After refining quantitatively the D-brane instanton calculus for corrections to the gauge kinetic function, we explicitly apply it to the Type I toroidal orbifold d...

We provide arguments for the existence of novel hereinafter called polyinstanton corrections to holomorphic couplings in four-dimensional N=1 supersymmetric string compactifications. After refining quantitatively the D-brane instanton calculus for corrections to the gauge kinetic function, we explicitly apply it to the Type I toroidal orbifold defined in arXiv:0710.3080 and compare the results to the proposed heterotic S-dual model. This leads us to the intriguing conclusion that N=1 string vacua feature a power tower like proliferation of instanton corrections. Minimize

Contributors:

The Pennsylvania State University CiteSeerX Archives

Year of Publication:

2013-09-30

Source:

http://arxiv.org/pdf/0803.1562v2.pdf

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text

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en

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Title:

Gauge Thresholds and Kähler Metrics for Rigid Intersecting D-brane Models

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The gauge threshold corrections for globally consistent Z2 ×Z ′ 2 orientifolds with rigid intersecting D6-branes are computed. The one-loop corrections to the holomorphic gauge kinetic function are extracted and the Kähler

The gauge threshold corrections for globally consistent Z2 ×Z ′ 2 orientifolds with rigid intersecting D6-branes are computed. The one-loop corrections to the holomorphic gauge kinetic function are extracted and the Kähler Minimize

Contributors:

The Pennsylvania State University CiteSeerX Archives

Year of Publication:

2013-08-06

Source:

http://arxiv.org/pdf/0711.0866v2.pdf

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text

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en

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Title:

Non-perturbative SQCD superpotentials from string instantons

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The Affleck–Dine–Seiberg instanton generated superpotential for SQCD with Nf = Nc − 1 flavours is explicitly derived from a local model of engineered intersecting D6-branes with a single E2-instanton. This computation extends also to symplectic gauge groups with Nf = Nc flavours.

The Affleck–Dine–Seiberg instanton generated superpotential for SQCD with Nf = Nc − 1 flavours is explicitly derived from a local model of engineered intersecting D6-branes with a single E2-instanton. This computation extends also to symplectic gauge groups with Nf = Nc flavours. Minimize

Contributors:

The Pennsylvania State University CiteSeerX Archives

Year of Publication:

2013-09-30

Source:

http://arxiv.org/pdf/hep-th/0612132v2.pdf

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en

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