On gauge couplings and thresholds in Type I Gepner models and otherwise

Anastasopoulos, Pascal; Bianchi, Massimo; Sarkissian, Gor; Stanev, Yassen S.

doi:10.1088/1126-6708/2007/03/059

Cited by 15 publications

(20 citation statements)

References 111 publications

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“…To obtain planar, non-planar and un-oriented contributions one has to choose the specific modular parameter and the corresponding integration domain. The result is generically divergent for both N = 1, 2 sectors, wherein it encodes β-functions and one-loop threshold corrections to the gauge kinetic functions [31,32]. As already observed, it vanishes in N = 4 sectors, which points to the no-bubble conjecture in N = 4 SYM, i.e.…”

Section: N = 4 Sectorssupporting

confidence: 59%

“…The world-sheet integral give us the same contribution in terms of modular parameter T (or ℓ). This should be interpreted in terms of the running of the field-dependent gauge couplings [32] and is to be expected as a result of supersymmetry Ward identities that only allow the super-invariant W 2 for 2-and 3-point amplitudes, barring anomalous U(1)'s.…”

Section: Two-and Three-point 'Amplitudes'mentioning

confidence: 99%

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Simplifying one-loop amplitudes in superstring theory

Bianchi

Consoli

2016

J. High Energ. Phys.

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Abstract:We show that 4-point vector boson one-loop amplitudes, computed in [1] in the RNS formalism, around vacuum configurations with open unoriented strings, preserving at least N = 1 SUSY in D = 4, satisfy the correct supersymmetry Ward identities, in that they vanish for non MHV configurations (++++) and (−+++). In the MHV case (−−++) we drastically simplify their expressions. We then study factorisation and the limiting IR and UV behaviours and find some unexpected results. In particular no massless poles are exposed at generic values of the modular parameter. Relying on the supersymmetric properties of our bosonic amplitudes, we extend them to manifestly supersymmetric superamplitudes and compare our results with those obtained in the D = 4 hybrid formalism, pointing out difficulties in reconciling the two approaches for contributions from N = 1, 2 sectors.

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Section: N = 4 Sectorssupporting

confidence: 59%

Section: Two-and Three-point 'Amplitudes'mentioning

confidence: 99%

Simplifying one-loop amplitudes in superstring theory

Bianchi

Consoli

2016

J. High Energ. Phys.

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“…[35][36][37][38]. Other studies of gauge threshold corrections for IIA/IIB brane models in string theory include [39][40][41][42][43][44][45]. As string theory is an on-shell theory this formally vanishes due to kinematic prefactors (k 2 = 0) but the threshold corrections can be extracted by removing this kinematic term.…”

Section: A Gauge Threshold Correctionsmentioning

confidence: 99%

One-loop Yukawa couplings in local models

Conlon

Goodsell

Palti

2010

J. High Energ. Phys.

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Abstract:We calculate the one-loop Yukawa couplings and threshold corrections for supersymmetric local models of branes at singularities in type IIB string theory. We compute the corrections coming both from wavefunction and vertex renormalisation. The former comes in the IR from conventional field theory running and in the UV from threshold corrections that cause it to run from the winding scale associated to the full Calabi-Yau volume. The vertex correction is naively absent as it appears to correspond to superpotential renormalisation. However, we find that while the Wilsonian superpotential is not renormalised there is a physical vertex correction in the 1PI action associated to light particle loops.

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“…Their mirror Type IIA description would require "co-isotropic" D-branes, i.e. wrapped rotated D-branes supporting non trivial magnetic fields associated to bundles with(out) vector structure [92,93].…”

Section: Discussionmentioning

confidence: 99%

Comments on orientifolds without vector structure

Bachas

Bianchi

Blumenhagen

et al. 2008

J. High Energy Phys.

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We revisit type I compactifications with a Spin(32)/Z 2 gauge bundle that admits no vector structure. We elucidate the relation of this Z 2 obstruction to discrete Bfield flux and to 't Hooft flux and clarify some subtleties in the T-duality transformation to type IIA intersecting D-brane models. We reexamine the earliest 3-generation GUT model on magnetized D-branes and show its consistency when a discrete B-flux is switched on. We further generalize partially known results for toroidal models to type I compactifications without vector structure and their mirror dual type IIA orientifolds on genuine Calabi-Yau manifolds. We illustrate this by working out the example of the quintic in some detail.

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On gauge couplings and thresholds in Type I Gepner models and otherwise

Cited by 15 publications

References 111 publications

Simplifying one-loop amplitudes in superstring theory

Simplifying one-loop amplitudes in superstring theory

One-loop Yukawa couplings in local models

Comments on orientifolds without vector structure

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