[Users] Event horizon finder for 1d data

[Eloisa Bentivegna]

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