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Today's Topics:

   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@cct.lsu.edu>
Subject: [Users] No Einstein Toolkit Meeting
To: users@einsteintoolkit.org
Message-ID: <20170116132548.GA3564@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@aei.mpg.de>
Subject: Re: [Users] Event horizon finder for 1d data
To: Maitraya Bhattacharyya <maitraya.linux@gmail.com>
Cc: Einstein Toolkit Users <users@einsteintoolkit.org>
Message-ID: <B4EF6B25-53FF-40C7-9745-F6513702BDB6@aei.mpg.de>
Content-Type: text/plain; charset="us-ascii"


On 11 Jan 2017, at 19:08, Maitraya Bhattacharyya <maitraya.linux@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@ct.infn.it>
Subject: Re: [Users] Event horizon finder for 1d data
To: users@einsteintoolkit.org
Message-ID: <23284f5a-34e3-0d1d-955e-b7ce102cdafb@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@gmail.com <mailto:maitraya.linux@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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