[Users] Users Digest, Vol 148, Issue 12

[Luciano Combi]

Excellent, Miguel, that worked!

Cheers.


El dom, 24 jul 2022 a las 14:19, <users-request at einsteintoolkit.org>
escribió:

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>    1. Re: AHFinderDirect test in cosmology (Miguel Zilhão)
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> ----------------------------------------------------------------------
>
> Message: 1
> Date: Sat, 23 Jul 2022 23:26:28 +0100
> From: Miguel Zilhão <mzilhao at ua.pt>
> Subject: Re: [Users] AHFinderDirect test in cosmology
> To: Luciano Combi <combi.luciano at gmail.com>,
>         <users at einsteintoolkit.org>
> Message-ID: <4aea2a6a-777e-eeb7-6613-59489eeb999f at ua.pt>
> Content-Type: text/plain; charset="UTF-8"; format=flowed
>
> hi Luciano,
>
> we've done something like this in https://arxiv.org/abs/1204.2019
> you can indeed find cosmological apparent horizons using AHFinderDirect,
> the trick is to add the
> following parameter:
>
> AHFinderDirect::surface_definition[1]   = "inner expansion"
>
> hope this helps.
>
> cheers,
> Miguel
>
> On 23/07/2022 06:48, Luciano Combi wrote:
> > Hi all,
> >
> > I'm trying to use AHFinderDirect to find the apparent horizon in the de
> Sitter metric, implemented
> > in the Exact thorn in comoving coordinates. I tried a few things but
> cannot get it to work. Have
> > someone tried something similar, i.e. using the AHFD in cosmological
> spacetimes instead of BHs?
> > Below I attach a typical parfile I used
> >
> > Thanks!
> > -------------------------------------------------------
> > # flesh
> > cactus::cctk_itlast = 0
> >
> > ActiveThorns = "PUGH"
> > driver::ghost_size = 3
> > driver::global_nx = 120
> > driver::global_ny = 120
> > driver::global_nz = 120 ##57
> >
> > ActiveThorns = "CoordBase SymBase CartGrid3D"
> > grid::avoid_origin = "false"
> > grid::type = "byspacing"
> > grid::dxyz = 0.2
> >
> > ActiveThorns = "ADMBase ADMCoupling StaticConformal CoordGauge SpaceMask
> Exact"
> > ADMBase::initial_lapse = "exact"
> > ADMBase::initial_shift = "exact"
> > ADMBase::initial_data = "exact"
> > ADMBase::lapse_evolution_method = "exact"
> > ADMBase::shift_evolution_method = "exact"
> > ADMBase::metric_type = "physical"
> > Exact::exact_model = "de Sitter+Lambda"
> > Exact::de_Sitter_Lambda__scale = 0.50
> >
> >
> > ########################################
> >
> > ActiveThorns = "IOUtil"
> > IOUtil::parfile_write = "no"
> >
> > ########################################
> >
> > ActiveThorns = "AEILocalInterp PUGHInterp PUGHReduce SphericalSurface
> AHFinderDirect"
> >
> > AHFinderDirect::print_timing_stats = "true"
> >
> > AHFinderDirect::output_Theta_every = 1
> > AHFinderDirect::h_base_file_name     = "dS.h"
> > AHFinderDirect::Theta_base_file_name = "dS.Theta"
> >
> > AHFinderDirect::N_horizons = 1
> > AHFinderDirect::origin_x[1] = 0.0
> > AHFinderDirect::origin_y[1] = 0.0
> > AHFinderDirect::origin_z[1] = 0.0
> >
> > AHFinderDirect::initial_guess_method[1] = "coordinate sphere"
> > AHFinderDirect::initial_guess__coord_sphere__x_center[1] =  0.0
> > AHFinderDirect::initial_guess__coord_sphere__y_center[1] =  0.0
> > AHFinderDirect::initial_guess__coord_sphere__z_center[1] =  0.0
> > AHFinderDirect::initial_guess__coord_sphere__radius[1] = 1.0
> > ------------------------
> > --
> > *Luc Combi*
> > CONICET PhD fellow (Buenos Aires, Argentina)
> > Instituto Argentino de Radioastronomía
> >
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> End of Users Digest, Vol 148, Issue 12
> **************************************
>


-- 
*Luc Combi*
CONICET PhD fellow (Buenos Aires, Argentina)
Instituto Argentino de Radioastronomía
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