Re: [Users] About the thorn Einstein exact

[Nisa Amir]

I am just trying to add this spacetime, I dont want to use it in some other
thorns of the toolkit. and I am not familiar with xAct package.


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On Tue, Nov 7, 2017 at 8:31 PM, Ian Hinder  wrote:

>
> On 7 Nov 2017, at 14:04, Nisa Amir  wrote:
>
> Yes, the mathematica package is given but it accepts the metric only in
> cartesian coordinates. I want to add the spacetime non kerr which is in
> polar coordinates to the mathematica package in Einstein Exact thorn. What
> transformations should I made?
>
>
> Hi,
>
> You can apply the usual basis transformations in Mathematica to generate
> the metric in a quasi-Cartesian basis and coordinates.  This will then
> allow you to construct the spacetime numerically in these coordinates, and
> the thorns in the toolkit which expect quasi-Cartesian coordinates will
> just work, for example the horizon finder.  You would then evolve in 3+1
> dimensions.  I have done this for Kerr in Boyer-Lindquist coordinates using
> the xAct tensor manipulation package.  This is not straightforward, and
> it's not something that I would take on lightly if you don't have much
> experience with EinsteinExact or xAct.
>
> However, you have said that you want to store the gridfunctions in polar
> coordinates, and do the evolution in polar coordinates.  I have no
> experience with this, and many of the thorns in the toolkit which expect
> quasi-Cartesian coordinates will just not work (e.g. the horizon finder).
> That is why I asked you what you are trying to do.  Please can you answer
> that, before we go into a lot of detail about how to do it in one
> particular way, which may in the end not help you?
>
> Thanks!
>
> --
> Ian Hinder
> http://members.aei.mpg.de/ianhin
>
>
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Re: [Users] About the thorn Einstein exact

[Nisa Amir]

Yes, the mathematica package is given but it accepts the metric only in
cartesian coordinates. I want to add the spacetime non kerr which is in
polar coordinates to the mathematica package in Einstein Exact thorn. What
transformations should I made?


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On Mon, Nov 6, 2017 at 9:11 PM, Ian Hinder  wrote:

>
> On 5 Nov 2017, at 09:28, Nisa Amir  wrote:
>
> > Actually, when in the einsteinexact thorn there is a mathematica package
> named EinsteinExact. The documentation said that if you want to add some
> new space time add the space time in that mathematica package. I want to
> add non kerr which is in polar coordinates to that package, so that it
> generates a new thorn but I dont know how to do that.
> > Kindly guide me.
>
> Hi,
>
> Yes, you can add a new spacetime to the Metrics package (in
> Cactus/arrangements/EinsteinExact/m/Metrics/metrics). See the examples in
> there.  For example, Schwarzschild.m:
>
> (* ::Package:: *)
>
> {
>   "Name" -> "Schwarzschild",
>   "Description" -> "Schwarzschild spacetime",
>   "Dimensions" -> 4,
>   "Coordinates" -> {t, r, \[Theta], \[Phi]},
>   "Parameters" -> {M},
>   "Metric" -> {{-1 + 2 M / r, 0, 0, 0},
>{0, 1/(1 - 2 M / r), 0, 0},
>{0, 0, r^2, 0},
>{0, 0, 0, r^2 Sin[\[Theta]]^2}},
>   "SignDet" -> -1
> }
>
> The EinsteinExact package then uses this information to generate an exact
> solution thorn, which can be used for initial data in a numerical
> relativity evolution.   However, it only supports metrics which are
> explicitly given in Cartesian coordinates, so for example, the
> Schwarzschild example won't work with it (the Metrics package is generic,
> and is used also in other contexts, outside EinsteinExact).
>
> There is a check in arrangements/EinsteinExact/m/EinsteinExact.m that the
> metric is in Cartesian coordinates.  I suspect that the only reason for
> this check is that it wouldn't know what Cactus gridfunctions to use for
> anything else.
>
> Since you want to do the evolution in polar coordinates, I assume that you
> are going to have some mapping between x, y and z, and r, th and ph?  I
> must admit I have never tried to do something like this.
>
> There are people on this list who have done evolutions in polar
> coordinates; maybe one of them could give some advice about whether what
> you are trying to do is feasible?  Maybe you could give more details about
> what you are trying to do?
>
> PS: *please* include users@einsteintoolkit.org in the CC when you reply.
> If you reply just to me, then nobody else benefits from the discussion, and
> nobody else has the opportunity to help you.
>
> --
> Ian Hinder
> http://members.aei.mpg.de/ianhin
>
>
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Re: [Users] Joining users email list

[Roland Haas]

Hello Steve,

> I have to approve emails from non-subscribers. Unless you want to see
> 100 adds for Viagra.
I know (Frank already told me last time I asked a similar question) :-).
I am not suggesting to open up the mailing list (unless we can get the
same type of SPAM filter that the Universities use for our email
accounts [mine is very Viagra free and I don't do anything]).

Having said that, if someone knows how to hook up SPAM filtering with
Mailman (2 or 3) that would be great. Not having to sign up to be able
to post would be great.

Yours,
Roland

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Re: [Users] Joining users email list

[Steven R. Brandt]

I have to approve emails from non-subscribers. Unless you want to see 
100 adds for Viagra.


--Steve


On 11/07/2017 08:27 AM, Roland Haas wrote:

Hello Ian,


It doesn't say anything about subscribing, or needing to.

As far as I know subscription is required. Try eg to post with say a
gmail address that you have not subscribed to the list (eg using
gmail's web interface).

I have just tried this with a private email address and indeed I cannot
post ("Your message to Users awaits moderator approval").


Can someone who is an administrator of the list check to see what the
setting is?  If people need to subscribe, then we should give
instructions on the web page.

See above.

Yours,
Roland



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Re: [Users] About the thorn Einstein exact

[Ian Hinder]

On 7 Nov 2017, at 14:04, Nisa Amir  wrote:

> Yes, the mathematica package is given but it accepts the metric only in 
> cartesian coordinates. I want to add the spacetime non kerr which is in polar 
> coordinates to the mathematica package in Einstein Exact thorn. What 
> transformations should I made?

Hi,

You can apply the usual basis transformations in Mathematica to generate the 
metric in a quasi-Cartesian basis and coordinates.  This will then allow you to 
construct the spacetime numerically in these coordinates, and the thorns in the 
toolkit which expect quasi-Cartesian coordinates will just work, for example 
the horizon finder.  You would then evolve in 3+1 dimensions.  I have done this 
for Kerr in Boyer-Lindquist coordinates using the xAct tensor manipulation 
package.  This is not straightforward, and it's not something that I would take 
on lightly if you don't have much experience with EinsteinExact or xAct.

However, you have said that you want to store the gridfunctions in polar 
coordinates, and do the evolution in polar coordinates.  I have no experience 
with this, and many of the thorns in the toolkit which expect quasi-Cartesian 
coordinates will just not work (e.g. the horizon finder).  That is why I asked 
you what you are trying to do.  Please can you answer that, before we go into a 
lot of detail about how to do it in one particular way, which may in the end 
not help you?

Thanks!

-- 
Ian Hinder
http://members.aei.mpg.de/ianhin

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Re: [Users] Joining users email list

[Roland Haas]

Hello Ian,

> It doesn't say anything about subscribing, or needing to.
As far as I know subscription is required. Try eg to post with say a
gmail address that you have not subscribed to the list (eg using
gmail's web interface).

I have just tried this with a private email address and indeed I cannot
post ("Your message to Users awaits moderator approval").

> Can someone who is an administrator of the list check to see what the
> setting is?  If people need to subscribe, then we should give
> instructions on the web page.
See above.

Yours,
Roland

-- 
My email is as private as my paper mail. I therefore support encrypting
and signing email messages. Get my PGP key from http://pgp.mit.edu .


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Re: [Users] Error in thorn Vectors

[Eloisa Bentivegna]

On 06/11/17 20:09, Hamilton, Maria wrote:
> Hello Eloisa,
> 
> From my memory I'd say I am using the development version. 
> Is there a way to check this out?

Hi!

Since the ET is hosted in a collection of repositories, the direct way
would be to check which branch of each you're on. Alternatively, you can
simply start with a fresh checkout (of, say, the last release) and see
if you encounter the same problem.

I am posting this to the list in case someone else has a better
solution. In any case, please include this information when you open the
ticket.

> I tried to open ticket at: https://trac.einsteintoolkit.org, but I got this 
> message:
> Submission rejected as potential spam

I am not sure why this happens. Did you post as anonymous, or included
your (institutional) address email in the Reporter field?

Eloisa
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Re: [Users] Joining users email list

[Ian Hinder]

On 7 Nov 2017, at 00:44, Roland Haas  wrote:

> Hello Sam,
> 
>>This is Samuel Cupp from LSU. I would like to be added to the
>> users email list. I was told to just email the list to get that to
>> happen. This is the email address I would like added. Thanks in
>> advance!
> The list only lets members post so the fact that you could post would
> mean you are already a member (or one of the admins ok'ed the post).

Hi Roland,

Is that really the case?  The instructions at 
http://einsteintoolkit.org/support.html say

The Einstein Toolkit Consortium is aiming to cultivate a 
self-supporting and open community and we encourage you to write to the 
users@einsteintoolkit.org mail list with your questions about the use of the 
toolkit.

It doesn't say anything about subscribing, or needing to.

Can someone who is an administrator of the list check to see what the setting 
is?  If people need to subscribe, then we should give instructions on the web 
page.

--
Ian Hinder
http://members.aei.mpg.de/ianhin



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Re: [Users] meeting minutes for 2017-11-06

[Ian Hinder]

On 6 Nov 2017, at 17:31, Ian Hinder  wrote:

> 
> On 6 Nov 2017, at 17:06, Roland Haas  wrote:
> 
>> * 6 failing tests
>> ** prolongation one is new, need input from Erik, want trac ticket
> 
> It turns out that this was already discussed in the original ticket for the 
> feature, https://trac.einsteintoolkit.org/ticket/2068, and was fixed in a 
> pull request 
> https://bitbucket.org/eschnett/carpet/pull-requests/19/correct-error-in-vertex-centred/diff,
>  which was reviewed as OK by Roland in 
> https://trac.einsteintoolkit.org/ticket/2074, but never applied.  I just 
> applied it.  Hopefully it will fix the problems.

It did.  We are now down to three failing tests, all in SphericalHarmonicRecon 
and SphericalHarmonicReconGen.

--
Ian Hinder
http://members.aei.mpg.de/ianhin



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