How to reach the correct sin2 θW and αS in string theory

Nilles, Hans Peter; Stieberger, Stephan

doi:10.1016/0370-2693(95)01400-4

Cited by 42 publications

(39 citation statements)

References 50 publications

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“…Finally, the constraint (26), ρ/R ≪ Λ may be "relaxed" into ρ/R ≤ Λ or ρ/R ≈ Λ if one uses eq. (18), (19), (20) instead of (23), (26).…”

Section: One Extra-dimension and Wilson Line Correctionsmentioning

confidence: 99%

Wilson lines corrections to gauge couplings from a field theory approach

Ghilencea

2003

Nuclear Physics B

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Using an effective field theory approach, we address the effects on the gauge couplings of one and two additional compact dimensions in the presence of a constant background (gauge) field. Such background fields are a generic presence in models with extra dimensions and can be employed are present. This correction is not recoverable by the limit α ′ → 0 of the (infrared regularised) string because the infrared regularisation limit and the limit α ′ → 0 of the string result do not commute.1

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“…Finally, the constraint (26), ρ/R ≪ Λ may be "relaxed" into ρ/R ≤ Λ or ρ/R ≈ Λ if one uses eq. (18), (19), (20) instead of (23), (26).…”

Section: One Extra-dimension and Wilson Line Correctionsmentioning

confidence: 99%

Wilson lines corrections to gauge couplings from a field theory approach

Ghilencea

2003

Nuclear Physics B

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“…This replacement then turns out to imply that for such (2, 0) string compactifications, it is effectively a product of moduli that determines the size of threshold corrections. Consequently, barring other cancellations, suitably chosen O(1) values for individual moduli have the potential to yield larger threshold corrections [81]. Unfortunately, this interesting mechanism has not yet been realized within the context of realistic three-generation string models.…”

Section: Sizes Of Threshold Corrections: Moduli Dependencementioning

confidence: 99%

String theory and the path to unification: A review of recent developments

Dienes¹

1997

Physics Reports

292

298

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This is a pedagogical review article surveying the various approaches towards understanding gauge coupling unification within string theory. As is well known, one of the major problems confronting string phenomenology has been an apparent discrepancy between the scale of gauge coupling unification predicted within string theory, and the unification scale expected within the framework of the Minimal Supersymmetric Standard Model (MSSM). In this article, I provide an overview of the different approaches that have been taken in recent years towards reconciling these two scales, and outline some of the major recent developments in each. These approaches include string GUT models; higher affine levels and non-standard hypercharge normalizations; heavy string threshold corrections; light supersymmetric thresholds; effects from intermediate-scale gauge and matter structure beyond the MSSM; strings without supersymmetry; and strings at strong coupling. *

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“…Including also the 75 and 200 would of course widen the available parameter space. Similar relations hold for SO (10). The high-scale mass patterns of the gauginos of SU(3) C , SU(2) L and U(1) Y turn out to be given as linear combinations of singlet (m 1/2 ) and 24-plet (m 24 ) contributions [29],…”

Section: Non-singlet F -Termsmentioning

confidence: 65%

Precision gauge unification in the MSSM

2010

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We discuss the issue of precision gauge unification in the MSSM. We find that a comparably light gluino, as it emerges in certain patterns of soft supersymmetry breaking, can be a key ingredient for ensuring precision gauge unification without relying on the presence of extra particles around the scale of grand unification. In particular, the so-called mirage pattern for gaugino masses can naturally lead to precision gauge unification. There is also an interesting correlation with reduced fine-tuning, due to rather light gluinos.

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How to reach the correct sin2 θW and αS in string theory

Cited by 42 publications

References 50 publications

Wilson lines corrections to gauge couplings from a field theory approach

Wilson lines corrections to gauge couplings from a field theory approach

String theory and the path to unification: A review of recent developments

Precision gauge unification in the MSSM

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