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33 papers · 2 filters
String-derived MSSM vacua with residual R symmetries
Rolf Kappl, Bjoern Petersen, Stuart Raby +3
Recently it was shown that there is a unique Z_4^R symmetry for the MSSM which allows the Yukawa couplings and dimension five neutrino mass operator, forbids the mu term and commut…
Higher Loop Spin Field Correlators in Various Dimensions
D. Haertl, O. Schlotterer
We compute higher-point superstring correlators involving spin fields in various even space-time dimensions D at tree-level and to arbitrary loop order. This generalizes previous w…
Transitions in the Web of Heterotic Vacua
Lara B. Anderson, James Gray, Burt Ovrut
We analyze transitions between heterotic vacua with distinct gauge bundles using two complementary methods - the effective four-dimensional field theory and the corresponding geome…
A recursive method for SYM n-point tree amplitudes
Carlos R. Mafra, Oliver Schlotterer, Stephan Stieberger +1
We present a recursive method for super Yang-Mills color-ordered n-point tree amplitudes based on the cohomology of pure spinor superspace in ten space-time dimensions. The amplitu…
Nonassociative Gravity in String Theory?
Ralph Blumenhagen, Erik Plauschinn
In an on-shell conformal field theory approach, we find indications of a three-bracket structure for target space coordinates in general closed string backgrounds. This generalizes…
Five-Brane Superpotentials, Blow-Up Geometries and SU(3) Structure Manifolds
Thomas W. Grimm, Albrecht Klemm, Denis Klevers
We investigate the dynamics of space-time filling five-branes wrapped on curves in heterotic and orientifold Calabi-Yau compactifications. We first study the leading N=1 scalar pot…