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On Fluxed Instantons and Moduli Stabilisation in IIB Orientifolds and F-theory

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arxiv 1105.3193 v2 pith:VZKISKFL submitted 2011-05-16 hep-th hep-ph

Thomas W. Grimm , Max Kerstan , Eran Palti , Timo Weigand This is my paper · ORCID
classification hep-thhep-ph
keywords modulistabilisationinstantonsfluxinstantonchargedeuclideanf-theory
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We study the superpotential induced by Euclidean D3-brane instantons carrying instanton flux, with special emphasis on its significance for the stabilisation of Kahler moduli and Neveu-Schwarz axions in Type IIB orientifolds. Quite generally, once a chiral observable sector is included in the compactification, arising on intersecting D7-branes with world-volume flux, resulting charged instanton zero modes prevent a class of instantons from participating in moduli stabilisation. We show that instanton flux on Euclidean D3-branes can remove these extra zero modes and helps in reinstating full moduli stabilisation within a geometric regime. We comment also on the F-theoretic description of this effect of alleviating the general tension between moduli stabilisation and chirality. In addition we propose an alternative solution to this problem based on dressing the instantons with charged matter fields which is unique to F-theory and cannot be realised in the weak coupling limit.

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Cited by 5 Pith papers

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  1. New Type IIB Poly-instanton Effects and Axion Quintessence

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    Deformation divisors can generate poly-instanton superpotential terms in type IIB Calabi-Yau orientifolds when O3-planes lie on the E3-brane, with explicit CY examples and an axion-quintessence construction matching t...

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  3. Quadratic Axion Couplings in String Theory

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  4. Testing F-theory GUTs with the Axiverse

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    In F-theory GUTs, non-universal ALPs induced by hypercharge flux satisfy g_aγ/m_a well below the QCD axion prediction when gauge couplings unify near the string scale.

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    Adding a base-modulus redefinition to fibre inflation in perturbative LVS shifts (ns, r) into ACT-allowed territory and yields an axion quintessence companion.

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