منابع مشابه
Contact interactions in D-brane models
We compute the tree-level four-point scattering amplitudes in string models where matter fields live on D-brane intersections. Extracting the contribution of massless modes, we are left with dimension-six four-fermion operators which in general receive contributions from three different sources: exchange of massive Kaluza–Klein excitations, winding modes and string oscillator states. We compute...
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We analyze proton decay via dimension six operators in certain GUT-like models derived from Type IIA orientifolds with D6-branes. The amplitude is parametrically enhanced by a factor of α −1/3 GUT relative to the coresponding result in four-dimensional GUT’s. Nonetheless, even assuming a plausible enhancement from the threshold corrections, we find little overall enhancement of the proton decay...
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Massive D=4 N=2 supersymmetric sigma models typically admit domain wall (Q-kink) solutions and string (Q-lump) solutions, both preserving 1/2 supersymmetry. We exhibit a new static 1/4 supersymmetric ‘kink-lump’ solution in which a string ends on a wall, and show that it has an effective realization as a BIon of the D=4 super DBI-action. It is also shown to have a timedependent Q-kink-lump gene...
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ژورنال
عنوان ژورنال: Journal of High Energy Physics
سال: 2019
ISSN: 1029-8479
DOI: 10.1007/jhep07(2019)048