Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
1998-12-14
Nucl.Phys.B553:133-154,1999
Physics
High Energy Physics
High Energy Physics - Theory
28 pages, LaTeX, typos corrected
Scientific paper
10.1016/S0550-3213(99)00232-1
We study total and partial supersymmetry breaking by freely acting orbifolds, or equivalently by Scherk-Schwarz compactifications, in type I string theory. In particular, we describe a four-dimensional chiral compactification with spontaneously broken N=1 supersymmetry, some models with partial $N=4\to N=2$ and $N=4\to N=1$ supersymmetry breaking and their heterotic and M-theory duals. A generic feature of these models is that in the gravitational sector and in the spectrum of D-branes parallel to the breaking coordinate, all mass splittings are proportional to the compactification scale, while global (extended) supersymmetry remains unbroken at tree level for the massless excitations of D-branes transverse to the breaking direction.
Antoniadis Ignatios
D'Appollonio Giuseppe
Dudas Emilian
Sagnotti Augusto
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