[Users] GRMHD and the upcoming ET workshop

[Frank Loeffler]

Dear Zach,

On Mon, Oct 24, 2011 at 11:37:01AM -0500, Zach Etienne wrote:
> We (the Illinois Relativity group) have been following the ET mailing list
> with great interest since its inception and were planning to send
> representatives to the upcoming ET workshop.  Sadly, we will be too busy
> preparing for the Midwest Relativity Meeting, which we are hosting the
> following weekend.

That is too bad indeed. We should find another opportunity in the
future.

> As many of you know, we currently evolve the vector potential to perform
> GRMHD simulations with divergence-free magnetic fields.  We found some major
> problems with our original implementation when evolving magnetized binary
> inspirals, such as BHNS inspirals.  We discovered that the problems were due
> to a zero-speed EM gauge mode, and after switching to another (Lorenz) EM
> gauge, we find huge improvements.
> 
> We recently posted a paper summarizing our findings at:
> http://arxiv.org/abs/1110.4633

Would you be interested to summarize and discuss these results within an
Einstein Toolkit call? We usually use plain phone for the calls, but
would use evo as second option for opportunities like this, and we would
announce it accordingly.

The call is always open to the public anyway - please feel free to call
in. The next call will be Mon Nov 7th, at 10am central time, and usually
an announcement is sent the day before.

Frank

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