[Users] Propose thorns for inclusion in the EinsteinToolkit

[Barry Wardell]

Is there any interest in including this in the ET?

On Fri, Nov 25, 2011 at 6:46 PM, Barry Wardell <barry.wardell at aei.mpg.de>wrote:

> Hi,
>
> Recently Ian Hinder and I have created an arrangement of thorns called
> EinsteinExact which provide some exact solutions for use in Cactus. The
> scope of these thorns is similar to that of the Exact thorn but with some
> notable improvements:
>
> * The extrinsic curvature is computed symbolically rather than using
> finite differencing so it should be accurate to within roundoff. This means
> that EinsteinExact is more exact than Exact.
> * The solutions used in EinsteinExact come from a database of metrics
> which have been correctness-tested, e.g., by checking symbolically that
> they are a solution of the Einstein equation.
> * EinsteinExact is written in Mathematica and uses Kranc, so the raw
> source is very small (~250 lines) and easy to understand.
> * Adding a spacetime is as simple as typing the components of the metric
> into Mathematica.
>
> So far, the spacetimes included are Minkowski, Kerr-Schild, gauge wave and
> shifted gauge wave, but the list can easily be extended in the future.
> There is also support for arbitrary rotations, using the same conventions
> as the Exact thorn uses. We have not yet included the other transformations
> supported by Exact, but they shouldn't be difficult to add.
>
> We have checked that for these spacetimes the Exact solutions converge to
> the EinsteinExact solutions at the correct finite differencing order used
> by Exact.
>
> We would like to propose the EinsteinExact arrangement for inclusion in
> the EinsteinToolkit. If you would like to try it out, you can get it using:
>
> git clone --recursive git://github.com/barrywardell/EinsteinExact
>
> Any comments or suggestions are welcome.
>
> Regards,
> Barry
>
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