I determine the twisted K–theory of all compact simply connected simple Lie groups. The computation reduces via the Freed–Hopkins–Teleman theorem  to the CFT prescription, and thus explains why it gives the correct result. Finally I analyze the exceptions noted by Bouwknegt et al .
We present an encompassing treatment of D–brane charges in supersymmetric SO(3) WZW models. There are two distinct supersymmetric CFTs at each even level: the standard bosonic SO(3) modular invariant tensored with free fermions, as well as a novel twisted model. We calculate the relevant twisted K–theories and find complete agreement with the CFT analysis… (More)
—In this paper, we provide an overview on backhaul requirements in mobile networks featuring inter-site cooperation. We consider a heterogeneous deployment, where small cells are embedded into macro-cells. For reducing inter-cell interference , we consider intra-and inter-site joint transmission (JT)-coordinated multi-point (CoMP) in fully flexible… (More)
Stable, holomorphic vector bundles are constructed on an torus fibered, non-simply connected Calabi-Yau threefold using the method of bundle extensions. Since the manifold is multiply connected, we work with equiv-ariant bundles on the elliptically fibered covering space. The cohomology groups of the vector bundle, which yield the low energy spectrum, are… (More)
It is shown that strongly coupled heterotic M-theory with anti-five-branes in the S 1 /Z 2 bulk space can have meta-stable vacua which break N = 1 supersymmetry and have a small, positive cosmological constant. This is demonstrated for the " minimal " heterotic standard model. This vacuum has the exact MSSM matter spectrum in the observable sector, a… (More)
Intelligent Network (IN) services are customized telephone services, like e.g., 1) `Free-Phone', where the receiver of the call can be billed if some conditions are met, 2) `Universal Private Telephone', enabling groups of customers to deene their own private net within the public net, or 3) `Partner Lines', where a number of menus leads to the satisfaction… (More)
In previous papers, we introduced a heterotic standard model and discussed its basic properties. The Calabi-Yau threefold has, generically, three Kähler and three complex structure moduli. The observable sector of this vacuum has the spectrum of the MSSM with one additional pair of Higgs-Higgs conjugate fields. The hidden sector has no charged matter in the… (More)