TY - CHAP A1 - Heinisch, Isabelle A1 - Romeike, Ralf A1 - Knobelsdorf, Maria A1 - Kreitz, Christoph A1 - Nylén, Aletta A1 - Dörge, Christina A1 - Göttel, Timo A1 - Holz, Jan A1 - Bergner, Nadine A1 - Schroeder, Ulrik A1 - Metzger, Christiane A1 - Haag, Johann A1 - Abke, Jörg A1 - Schwirtlich, Vincent A1 - Sedelmaier, Yvonne A1 - Müller, Dorothee A1 - Frommer, Andreas A1 - Humbert, Ludger A1 - Berges, Marc A1 - Mühling, Andreas A1 - Hubwieser, Peter A1 - Steuer, Horst A1 - Engbring, Dieter A1 - Selke, Harald A1 - Drews, Paul A1 - Schirmer, Ingrid A1 - Morisse, Marcel A1 - Sagawe, Arno A1 - Rolf, Arno A1 - Friedemann, Stefan A1 - Gröger, Stefan A1 - Schumann, Matthias A1 - Klinger, Melanie A1 - Polutina, Olena A1 - Bibel, Ariane A1 - Götz, Christian A1 - Brinda, Torsten A1 - Apel, Rebecca A1 - Berg, Tobias A1 - Bergner, Nadine A1 - Chatti, Mohamed Amine A1 - Leicht-Scholten, Carmen A1 - Schroeder, Ulrik A1 - Al-Saffar, Loay Talib A1 - Petre, Marian A1 - Schirmer, Ingrid A1 - Rick, Detlef ED - Forbrig, Peter ED - Rick, Detlef ED - Schmolitzky, Axel T1 - HDI 2012 – Informatik für eine nachhaltige Zukunft : 5. Fachtagung Hochschuldidaktik der Informatik ; 06.–07. November 2012, Universität Hamburg N2 - Die Tagungsreihe zur Hochschuldidaktik der Informatik HDI wird vom Fachbereich Informatik und Ausbildung / Didaktik der Informatik (IAD) in der Gesellschaft für Informatik e. V. (GI) organisiert. Sie dient den Lehrenden der Informatik in Studiengängen an Hochschulen als Forum der Information und des Austauschs über neue didaktische Ansätze und bildungspolitische Themen im Bereich der Hochschulausbildung aus der fachlichen Perspektive der Informatik. Diese fünfte HDI 2012 wurde an der Universität Hamburg organisiert. Für sie wurde das spezielle Motto „Informatik für eine nachhaltige Zukunft“ gewählt, um insbesondere Fragen der Bildungsrelevanz informatischer Inhalte, der Kompetenzen für Studierende informatisch geprägter Studiengänge und der Rolle der Informatik in der Hochschulentwicklung zu diskutieren. T3 - Commentarii informaticae didacticae (CID) - 5 Y1 - 2013 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-62891 SN - 978-3-86956-220-9 PB - Universitätsverlag Potsdam CY - Potsdam ER - TY - JOUR A1 - Eichmair, Michael A1 - Metzger, Jan T1 - Unique isoperimetric foliations of asymptotically flat manifolds in all dimensions JF - Inventiones mathematicae Y1 - 2013 U6 - https://doi.org/10.1007/s00222-013-0452-5 SN - 0020-9910 SN - 1432-1297 VL - 194 IS - 3 SP - 591 EP - 630 PB - Springer CY - New York ER - TY - JOUR A1 - Andersson, Lars A1 - Metzger, Jan T1 - Curvature estimates for stable marginally trapped surfaces N2 - We derive local integral and sup-estimates for the curvature of stable marginally outer trapped surfaces in a sliced space-time. The estimates bound the shear of a marginally outer trapped surface in terms of the intrinsic and extrinsic curvature of a slice containing the surface. These estimates are well adapted to situations of physical interest, such as dynamical horizons. Y1 - 2010 UR - http://projecteuclid.org/DPubS?service=UI&version=1.0&verb=Display&handle=euclid.jdg SN - 0022-040X ER - TY - JOUR A1 - Eichmair, Michael A1 - Metzger, Jan T1 - Large isoperimetric surfaces in initial data sets JF - Journal of differential geometry N2 - We study the isoperimetric structure of asymptotically flat Riemannian 3-manifolds (M, g) that are C-0-asymptotic to Schwarzschild of mass m > 0. Refining an argument due to H. Bray, we obtain an effective volume comparison theorem in Schwarzschild. We use it to show that isoperimetric regions exist in (M, g) for all sufficiently large volumes, and that they are close to centered coordinate spheres. This implies that the volume-preserving stable constant mean curvature spheres constructed by G. Huisken and S.-T. Yau as well as R. Ye as perturbations of large centered coordinate spheres minimize area among all competing surfaces that enclose the same volume. This confirms a conjecture of H. Bray. Our results are consistent with the uniqueness results for volume-preserving stable constant mean curvature surfaces in initial data sets obtained by G. Huisken and S.-T. Yau and strengthened by J. Qing and G. Tian. The additional hypotheses that the surfaces be spherical and far out in the asymptotic region in their results are not necessary in our work. Y1 - 2013 SN - 0022-040X VL - 94 IS - 1 SP - 159 EP - 186 PB - International Press of Boston CY - Somerville ER - TY - JOUR A1 - Lamm, Tobias A1 - Metzger, Jan T1 - Minimizers of the willmore functional with a small area constraint JF - ANNALES DE L INSTITUT HENRI POINCARE-ANALYSE NON LINEAIRE N2 - We show the existence of a smooth spherical surface minimizing the Willmore functional subject to an area constraint in a compact Riemannian three-manifold, provided the area is small enough. Moreover, we partially classify complete surfaces of Willmore type with positive mean curvature in Riemannian three-manifolds. KW - Willmore functional KW - Minimizers KW - Direct method Y1 - 2013 U6 - https://doi.org/10.1016/j.anihpc.2012.10.003 SN - 0294-1449 VL - 30 IS - 3 SP - 497 EP - 518 PB - Elsevier CY - Paris ER - TY - JOUR A1 - Eichmair, Michael A1 - Metzger, Jan T1 - On large volume preserving stable CMC surfaces in initial data sets JF - Journal of differential geometry N2 - Let (M, g) be a complete 3-dimensional asymptotically flat manifold with everywhere positive scalar curvature. We prove that, given a compact subset K subset of M, all volume preserving stable constant mean curvature surfaces of sufficiently large area will avoid K. This complements the results of G. Huisken and S.-T. Yau [17] and of J. Qing and G. Tian [26] on the uniqueness of large volume preserving stable constant mean curvature spheres in initial data sets that are asymptotically close to Schwarzschild with mass m > 0. The analysis in [17] and [26] takes place in the asymptotic regime of M. Here we adapt ideas from the minimal surface proof of the positive mass theorem [32] by R. Schoen and S.-T. Yau and develop geometric properties of volume preserving stable constant mean curvature surfaces to handle surfaces that run through the part of M that is far from Euclidean. Y1 - 2012 SN - 0022-040X VL - 91 IS - 1 SP - 81 EP - 102 PB - International Press of Boston CY - Somerville ER - TY - JOUR A1 - Lamm, Tobias A1 - Metzger, Jan A1 - Schulze, Felix T1 - Foliations of asymptotically flat manifolds by surfaces of Willmore type JF - Mathematische Annalen N2 - The goal of this paper is to establish the existence of a foliation of the asymptotic region of an asymptotically flat manifold with positive mass by surfaces which are critical points of the Willmore functional subject to an area constraint. Equivalently these surfaces are critical points of the Geroch-Hawking mass. Thus our result has applications in the theory of general relativity. Y1 - 2011 U6 - https://doi.org/10.1007/s00208-010-0550-2 SN - 0025-5831 VL - 350 IS - 1 SP - 1 EP - 78 PB - Springer CY - New York ER - TY - JOUR A1 - Moesta, Philip A1 - Andersson, Lars A1 - Metzger, Jan A1 - Szilagyi, Bela A1 - Winicour, Jeffrey T1 - The merger of small and large black holes JF - Classical and quantum gravit N2 - We present simulations of binary black-hole mergers in which, after the common outer horizon has formed, the marginally outer trapped surfaces (MOTSs) corresponding to the individual black holes continue to approach and eventually penetrate each other. This has very interesting consequences according to recent results in the theory of MOTSs. Uniqueness and stability theorems imply that two MOTSs which touch with a common outer normal must be identical. This suggests a possible dramatic consequence of the collision between a small and large black hole. If the penetration were to continue to completion, then the two MOTSs would have to coalesce, by some combination of the small one growing and the big one shrinking. Here we explore the relationship between theory and numerical simulations, in which a small black hole has halfway penetrated a large one. KW - black holes KW - numerical relativity KW - trapped surfaces Y1 - 2015 U6 - https://doi.org/10.1088/0264-9381/32/23/235003 SN - 0264-9381 SN - 1361-6382 VL - 32 IS - 23 PB - IOP Publ. Ltd. CY - Bristol ER - TY - JOUR A1 - Eichmair, Michael A1 - Metzger, Jan T1 - JENKINS-SERRIN-TYPE RESULTS FOR THE JANG EQUATION JF - Journal of differential geometry N2 - Let (M, g, k) be an initial data set for the Einstein equations of general relativity. We show that a canonical solution of the Jang equation exists in the complement of the union of all weakly future outer trapped regions in the initial data set with respect to a given end, provided that this complement contains no weakly past outer trapped regions. The graph of this solution relates the area of the horizon to the global geometry of the initial data set in a non-trivial way. We prove the existence of a Scherk-type solution of the Jang equation outside the union of all weakly future or past outer trapped regions in the initial data set. This result is a natural exterior analogue for the Jang equation of the classical Jenkins Serrin theory. We extend and complement existence theorems [19, 20, 40, 29, 18, 31, 11] for Scherk-type constant mean curvature graphs over polygonal domains in (M, g), where (M, g) is a complete Riemannian surface. We can dispense with the a priori assumptions that a sub solution exists and that (M, g) has particular symmetries. Also, our method generalizes to higher dimensions. Y1 - 2016 U6 - https://doi.org/10.4310/jdg/1453910454 SN - 0022-040X SN - 1945-743X VL - 102 SP - 207 EP - 242 PB - International Press of Boston CY - Somerville ER -