Meeting minutes:

Present were: Tanja, Roland, Erik, Frank, Josh, Christian, Yosef, Béla Szilágyi, Maria Babiuc

CCE code: * thorns will (did) appear today in https://svn.einsteintoolkit.org/incoming/ arrangement suggestions are (as in in Frank's email): SphericalSlice -> CactusNumerical (analog SphericalSurface) new arrangement PITTNull (?) for CCE evolution code WorldTube -> PITTNull (CCE extraction thorn) ADMDerivatives -> EinsteinBase/EinsteinUtils (?) * please look at thorns once they appear and start discussion on mailing list * agree that PITTNull is the correct thorn name (since PITT was used in the papers) * CCE evolution is done in a Cactus thorn that uses PUGH * work cycle is to run the main simulation with an "interface" thorn that writes out initial data for the characteristic evolution, then run a postprocessing run using PUGH and the CCE thorn * two (interface) thorns to initial extract data for CCE ** original extraction code used in 1011.4223 by Yosef (stand-alone ?) *** tested with LazEv, currently being tested with McLachlan ** WorldTube by Christian Reisswig (requires extra infrastructure thorns) *** tested with MacLachlan and the AEI multipatch code (Llama?) * ask Christian Reisswig for short description of WorldTube, then decide whether to ** keep only one thorn ** keep both thorns ** merge them * requested citations for PITTNull are in README:

If you use this code, then we request that you cite the following papers:

Title: Characteristic Extraction Tool for Gravitational Waveforms Authors: M.C. Babiuc, B. Szilagyi, J. Winicour, Y. Zlochower arXiv:1011.4223 submitted to Physical Review D

Title: Cauchy-characteristic matching Authors: N. Bishop, R. Isaacson, R. Gomez, L. Lehner, B. Szilagyi, J. Winicour arXiv: gr-qc/9801070 Appeared in "On the Black Hole Trail" eds. Bala Iyer and Biplab Bhawal (Kluwer)

* license still needs to be specified in README file

new infrastructure thorns: * SphericalSlice: a mini driver operations on a sphere (IO, coordinates) * ADMDerivatives: computes time and space derivatives of the ADM variables

* status of examples in ET paper: ** TOV runs still in queue on QueenBee ** high res single distorted black hole has not been completed yet (there was quite a lot of waiting time on Kraken) but has made some progress (end reworded quote) * stellar collapse example: Christian will work on it

fall ET workshop: * Josh will send around old proposal for workshop to be used as starting point * organizers will decide on preliminary budget and speaker list for purposes of writing the skeleton proposal

Yours, Roland