[Users] Users Digest, Vol 82, Issue 6

Tue Jan 17 00:48:30 CST 2017

Dear Eloisa and others,

What I have is information about the 4d metric along an axis (say the z
axis). As far as I recall correctly, this is a Kerr black hole without any
scalar field but I may be wrong about that.

Thanks,
Maitraya.

On Jan 16, 2017 23:30, <users-request at einsteintoolkit.org> wrote:

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> Today's Topics:
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>    1. No Einstein Toolkit Meeting (Frank Loeffler)
>    2. Re: Event horizon finder for 1d data (Ian Hinder)
>    3. Re: Event horizon finder for 1d data (Eloisa Bentivegna)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Mon, 16 Jan 2017 07:25:49 -0600
> From: Frank Loeffler <knarf at cct.lsu.edu>
> Subject: [Users] No Einstein Toolkit Meeting
> To: users at einsteintoolkit.org
> Message-ID: <20170116132548.GA3564 at topf.wg>
> Content-Type: text/plain; charset="utf-8"
>
> Hi,
>
> There will *not* be an Einstein Toolkit meeting today.
>
> The next meeting will be on Mon Jan 23th, 2017, at the usual time:
> 9:30am US central time).
>
> Frank Loeffler
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> ------------------------------
>
> Message: 2
> Date: Mon, 16 Jan 2017 15:56:00 +0100
> From: Ian Hinder <ian.hinder at aei.mpg.de>
> Subject: Re: [Users] Event horizon finder for 1d data
> To: Maitraya Bhattacharyya <maitraya.linux at gmail.com>
> Cc: Einstein Toolkit Users <users at einsteintoolkit.org>
> Message-ID: <B4EF6B25-53FF-40C7-9745-F6513702BDB6 at aei.mpg.de>
> Content-Type: text/plain; charset="us-ascii"
>
>
> On 11 Jan 2017, at 19:08, Maitraya Bhattacharyya <maitraya.linux at gmail.com>
> wrote:
>
> > Dear all,
> >
> > I have some 1d black hole data for which I would like to locate the
> event horizon.
> >
> > However I am new to the Einstein toolkit and therefore need your help in
> doing this.
> >
> > Can you please point out any resources which might help me.
>
> Hi,
>
> Locating the event horizon in a generic 3D numerical spacetime is quite
> complicated and a lot of work (you need to trace null rays backwards in
> time, which means reading the metric from 3D Cactus-format data files).  If
> the data is 1D, then it is much simpler to use a method adapted to 1D,
> which would mean using something other than the Einstein Toolkit.  For
> example, it may be possible to do this in Mathematica, Matlab, or similar,
> or even directly in Python.
>
> Does someone have a suggestion for where Maitraya could look for numerical
> tools for doing this in 1D?
>
> --
> Ian Hinder
> http://members.aei.mpg.de/ianhin
>
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> ------------------------------
>
> Message: 3
> Date: Mon, 16 Jan 2017 16:19:30 +0100
> From: Eloisa Bentivegna <eloisa.bentivegna at ct.infn.it>
> Subject: Re: [Users] Event horizon finder for 1d data
> To: users at einsteintoolkit.org
> Message-ID: <23284f5a-34e3-0d1d-955e-b7ce102cdafb at ct.infn.it>
> Content-Type: text/plain; charset=windows-1252
>
> On 16/01/17 15:56, Ian Hinder wrote:
> >
> > On 11 Jan 2017, at 19:08, Maitraya Bhattacharyya
> > <maitraya.linux at gmail.com <mailto:maitraya.linux at gmail.com>> wrote:
> >
> >> Dear all,
> >>
> >> I have some 1d black hole data for which I would like to locate the
> >> event horizon.
> >>
> >> However I am new to the Einstein toolkit and therefore need your help
> >> in doing this.
> >>
> >> Can you please point out any resources which might help me.
> >
> > Hi,
> >
> > Locating the event horizon in a generic 3D numerical spacetime is quite
> > complicated and a lot of work (you need to trace null rays backwards in
> > time, which means reading the metric from 3D Cactus-format data files).
> >  If the data is 1D, then it is much simpler to use a method adapted to
> > 1D, which would mean using something other than the Einstein Toolkit.
> >  For example, it may be possible to do this in Mathematica, Matlab, or
> > similar, or even directly in Python.
> >
> > Does someone have a suggestion for where Maitraya could look for
> > numerical tools for doing this in 1D?
>
> Hi!
>
> I wonder if there is a much simpler solution in this case than tracing
> geodesics.
>
> Maitraya, is your "1d black hole" a vacuum, spherically symmetric
> spacetime in standard GR? Is it expressed in a static foliation (does
> the metric depend on time)?
>
> Best,
> Eloisa
>
>
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> End of Users Digest, Vol 82, Issue 6
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