We study total and partial supersymmetry breakingQ0y freely acting orbifolds, or equivalently by Scherk-Schwarz compactifications, in type I strifig theory. In particular, we describe a fourdimensional chirat compactification with spontaneously broken N = 1 supersymmetry, some models with partial N = 4 ---+ N = 2 and N = 4 ---+ 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.
|Titolo:||Partial Breaking of Supersymmetry, Open Strings and M Theory (TOPCITE: 103 citazioni su SPIRES HEP)|
|Data di pubblicazione:||1999|
|Appare nelle tipologie:||1.1 Articolo in rivista|