1. 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

2. 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

3. 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

4. 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