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...
متن کاملDifferent D-brane Interactions
We use rotation of one D-brane with respect to the other to reveal the hidden structure of D-branes in type-II theories. This is done by calculation of the interaction amplitude for two different parallel and angled branes. The analysis of strings with different boundary conditions at the ends is also given. The stable configuration for two similar branes occurs when they are anti-parallel. For...
متن کاملProton Decay in Intersecting D-brane Models
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...
متن کاملD-brane Solitons in Supersymmetric Sigma-Models
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...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Journal of High Energy Physics
سال: 2001
ISSN: 1029-8479
DOI: 10.1088/1126-6708/2001/05/044