Numerical Relativity at AEI: What, Why??? Computation Cactus Gigabit Viz ASC Theory Formulations Pert. theory Tools: horizons, radiation, ... Enablers Leverage! No project had all this! Focus Physics Areas 3D Grazing BH’s (Largest Rel. simulation) 3D Wave Collapse 3D NS Mergers Grand Challenges Cactus Community Outreach/Collab ZIB/Garching LBL/NCSA/ANL EU Network NCSA/WashU NSF ASC Albert-Einstein-Institut www.aei-potsdam.mpg.de

Focused mostly on BH’s, Pert. Theory Initial data work on BHs New breakthroughs in EE formulations propagate through entire network New gauge conditions also crucial, important for entire network Lazarus project: applying perturbation theory to extend nonlinear numerical simulations Perturbation theory: spherical, time dependent background (e.g., collapsing star), and linear nonspherical perturbations on top Matter (NS and Scalar Fileds): Goodale, Hawley But next year: Hawke (hydro), Taniguchi (NS), others Albert-Einstein-Institut www.aei-potsdam.mpg.de

AEI Team Distorted BH’s Initial Data Colliding BH’s Gauge Team Allen, (Brandt, Camarda), Takahashi, E.S. Initial Data (Brandt), Brügmann, Diener, Koppitz, Takahasi, E.S. Colliding BH’s Axisymmetry: (old NCSA team of Anninos, Bernstein, Hobill, Smarr), E.S. Full 3D: Alcubierre, Brügmann, Diener, Hawley, Koppitz, (Nerger), Pollney, Takahashi, E.S. + Lazarus team Gauge Team Alcubierre, Baker, Brügmann, Pollney Perturbation theory Zerilli: Allen, (Camarda), Takahashi, Bose, E.S. Lazarus (linear ++): Baker, Brügmann, Campanelli, Lousto, Takahashi Stability, Accuracy Doctor Alcubierre Cactus Team: Allen, Goodale, Lanfermann, Radke, Kelly, E.S. Gigabit, Grid Computing Team: Benger, Dramlitsch, Hege, Kaehler, Merzky, Radke, E.S. Albert-Einstein-Institut www.aei-potsdam.mpg.de

Europe as Seen from Golm Ports hydro SOTON CCM, pert Active Network Collaborations with each group… WashU NS, BH AEI BH, NS, Comp Meudon NS, BH Jena PostN Garching NS Thess NS, pert Valencia hydro Palma BH, EEs Trieste NS, acc Rome pert Albert-Einstein-Institut www.aei-potsdam.mpg.de