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Bulletin
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Isometry Groups of Lorentzian Manifolds of Finite Volume and the Local Geometry of Compact Homogeneous Lorentz Spaces
Diploma Thesis from the year 2011 in the subject Mathematics - Geometry, grade: 1,0, Humboldt-University of Berlin (Institut für Mathematik), language: English, abstract: Based on the work of Adams and Stuck as well as on the work of Zeghib, we classify the Lie groups which can act isometrically and locally effectively on Lorentzian manifolds of finite volume. In the case that the corresponding Lie algebra contains a direct summand isomorphic to the two-dimensional special linear algebra or to a twisted Heisenbergalgebra, we also describe the geometric structure of the manifolds if they are compact. Using these results, we investigate the local geometry of compact homogeneous Lorentz spaces whose isometry groups have non-compact connected components. It turns out that they all are reductive. We investigate the isotropy representation, curvatures and holonomy. Especially, we obtain that any Ricci-flat compact homogeneous Lorentz space is flat or has compact isometry group.
Bulletin
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HESP
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The Record Collector
"A magazine for collectors of recorded vocal art" (varies).
Security Standardisation Research
This book constitutes the refereed proceedings of the 8th International Conference on Security Standardisation Research, SSR 2023, held in Lyon, France, on April 22-23, 2023. The papers broadly cover cryptographic techniques, network security, identity management, security processes, standardization procedures, and more in the area of existing and newly developed security standards. .
The Mossad
This book describes the clandestine missions that were defining moments in the evolution of the Mossad, including its pursuit of the Black September terrorists who murdered Israeli athletes at the 1972 Olympic Games, its acquisition on the high seas of yellowcake uranium for Israel's undeclared nuclear weapons program, and its role in bringing to justice Nazi war criminal Adolf Eichmann. The agency's more questionable deeds are also covered, among them the assassination of civilian scientists associated with Iraq's nuclear energy program and the abduction of Israeli citizen Mordechai Vanunu, who, like Edward Snowden, has been variously depicted as a principled whistleblower and an unscrupulous traitor. Taken together, the missions discussed in this volume illustrate the Mossad's character, creativity and courage, while acknowledging the problematical moral dimensions of its operations.
