Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2002-10-08
Nucl.Phys. B653 (2003) 85-108
Physics
High Energy Physics
High Energy Physics - Theory
26 pages, 5 figures; v2: version to appear in Nucl.Phys.B
Scientific paper
10.1016/S0550-3213(03)00040-3
We study the quantum stability of Type IIB orbifold and orientifold string models in various dimensions, including Melvin backgrounds, where supersymmetry (SUSY) is broken {\it \`a la} Scherk-Schwarz (SS) by twisting periodicity conditions along a circle of radius R. In particular, we compute the R-dependence of the one-loop induced vacuum energy density $\rho(R)$, or cosmological constant. For SS twists different from Z2 we always find, for both orbifolds and orientifolds, a monotonic $\rho(R)<0$, eventually driving the system to a tachyonic instability. For Z2 twists, orientifold models can have a different behavior, leading either to a runaway decompactification limit or to a negative minimum at a finite value R_0. The last possibility is obtained for a 4D chiral orientifold model where a more accurate but yet preliminary analysis seems to indicate that $R_0\to \infty$ or towards the tachyonic instability, as the dependence on the other geometric moduli is included.
Borunda Monica
Serone Marco
Trapletti Michele
No associations
LandOfFree
On the quantum stability of IIB orbifolds and orientifolds with Scherk-Schwarz SUSY breaking does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with On the quantum stability of IIB orbifolds and orientifolds with Scherk-Schwarz SUSY breaking, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and On the quantum stability of IIB orbifolds and orientifolds with Scherk-Schwarz SUSY breaking will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-548972