Present: Roland H, Bill G, Peter D, Leonardo R, Atul K, Miguel G, Yosef Z, Roberto DP, Zach E

Chair: Roland H, Minutes: Bill G

* Any first business

Roland, Think about code for inclusion to the ETK for six months from now.

Roberto, Working with Frank, and also Lorene and Lorene2.

Roland, in the ETK, we want to switch to the more modern version of Lorene, what we call Lorene2, update EOS.  Roberto, Main developer of Lorene has his own version, paper with Rezzola and Grandclement.

A new public code for initial data of unequal-mass, spinning compact-object binaries L. Jens Papenfort, Samuel D. Tootle, Philippe Grandclément, Elias R. Most, Luciano Rezzolla https://arxiv.org/abs/2103.09911

Roland, Lorene2 Zach was going to check with Josh Faber, RIT, about an issue moving to Lorene2.  Need to check the status of that.

Roberto, We are using old Lorene.  Newest version has many changes, but each seems minor.  Tabulated EOS then use Lorene from ETK for generating the initial data.  BNS initial data has a reader that does interpolation...to view the start without using ETK file output.  Never pushed this back to the Toolkit.  Eccentricity reduction is not in Lorene yet.

Roland, can we talk to you Roberto to find the differences between Lorene and Lorene2. Roberto, Adding one variable means the reader is no longer working.

Roland, If you generate with the old Lorene code initial data, the new one will fail. That is why we have a Lorene2 thorn.  Roberto, we should not support binary data for Lorene.  Using tabulated EOS even for polytropic, generate the table in Lorene format and use as input.  Roland, at the school end of July will be a session on how to generate data with Lorene and read it in.  Also the math setup for the initial data solver will be discussed there.

Atul K, 0 degree temp tabulated EOS, is there a way to do finite temperature? Roberto, not using barotropic, not including "Raw PE," a 1D table.  Temperature dependence is not supported.  Not specified by the physics.  Also the differential rotation profile, you put in my hand.  Roberto, always use tabulated EOS.  ETK wants piecewise polytropic.  Lorene2 did not have a limit on file size and Roberto is using 5000 points for the table.

Roberto, Meudon NS reader modified and working with both versions of the library. Older version links to Lorene, newer version links to Lorene2.

Atul, has a document on making NS initial data...will send to the Summer School NS people---using Lorene and not Lorene2.  Lorene must specify EOS and there are 20 classes or so.  Focusing on a few of the EOS in the document.

Roberto, if you want improvement in Lorene we would like that too.  Roland, would like to make Lorene2 the default version.  Josh Faber at RIT found that in the generating code something fishy between the French comments and the "English" code.  The Lorene developers have two versions of the code...one in French and the other in English.

* SPEC benchmark contribution [https://bitbucket.org/einsteintoolkit/tickets/issues/2470 task] [RH, SB]

No discussion.

[https://www.einsteintoolkit.org/tools/unanswered.php unanswered question on mailing list]

** Black Hole Excision by Hon Ka Hui needs to be answered.  They added some lines to the *.par and then excision seemed to occur.  Looks like a problem with the Spherical Surface being registered but not set, so it has an infinite radius.  They need to set the number of spherical surfaces, perhaps.

** IllinoisGRMHD and piece-wise polytrope or tabulated EOS.  This does not work need to use the development version, should contact Zach and/or Leo.

[https://bitbucket.org/einsteintoolkit/tickets/issues?status=open&status=... open tickets sorted by update time]

** #2538, Inclusion of kuibit.  Emails from Roland out soon.

** #2536, about cactuscode web server and WWW needed in front.

[https://bitbucket.org/einsteintoolkit/tickets/issues?status=new&status=o... tickets ready for review]

** #2527, an incorrect param file to ETK would cause Perl warnings too.  It should not, this fixes it.

* AOB

Chairs and Minute takers. June 24: Chair Peter and Minutes Atul