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- Afif Osseiran, Federico Boccardi, +11 authors Mikael Fallgren
- IEEE Communications Magazine
- 2014

- Volker Jungnickel, Konstantinos Manolakis, +6 authors Tommy Svensson
- IEEE Communications Magazine
- 2014

- Volker Braun
- 2004

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)

- Volker Braun
- 2008

I determine the twisted K–theory of all compact simply connected simple Lie groups. The computation reduces via the Freed–Hopkins–Teleman theorem [1] to the CFT prescription, and thus explains why it gives the correct result. Finally I analyze the exceptions noted by Bouwknegt et al [2].

- Ricardo B R Azevedo, Rolf Lohaus, +8 authors Armand M Leroi
- Nature
- 2005

Developmental processes are thought to be highly complex, but there have been few attempts to measure and compare such complexity across different groups of organisms. Here we introduce a measure of biological complexity based on the similarity between developmental and computer programs. We define the algorithmic complexity of a cell lineage as the length… (More)

- Volker Jungnickel, Konstantinos Manolakis, +4 authors Volker Braun
- ICC Workshops
- 2013

—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)

- Volker Braun
- 2006

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)