<div dir="ltr">Hi all,<div><br></div><div>I&#39;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</div><div><br></div><div>Thanks!</div><div>-------------------------------------------------------</div><div># flesh<br>cactus::cctk_itlast = 0<br><br>ActiveThorns = &quot;PUGH&quot;<br>driver::ghost_size = 3<br>driver::global_nx = 120<br>driver::global_ny = 120<br>driver::global_nz = 120 ##57<br><br>ActiveThorns = &quot;CoordBase SymBase CartGrid3D&quot;<br>grid::avoid_origin = &quot;false&quot;<br>grid::type = &quot;byspacing&quot;<br>grid::dxyz = 0.2<br><br>ActiveThorns = &quot;ADMBase ADMCoupling StaticConformal CoordGauge SpaceMask Exact&quot;<br>ADMBase::initial_lapse = &quot;exact&quot;<br>ADMBase::initial_shift = &quot;exact&quot;<br>ADMBase::initial_data = &quot;exact&quot;<br>ADMBase::lapse_evolution_method = &quot;exact&quot;<br>ADMBase::shift_evolution_method = &quot;exact&quot;<br>ADMBase::metric_type = &quot;physical&quot;<br>Exact::exact_model = &quot;de Sitter+Lambda&quot;<br>Exact::de_Sitter_Lambda__scale = 0.50<br><br><br>########################################<br><br>ActiveThorns = &quot;IOUtil&quot;<br>IOUtil::parfile_write = &quot;no&quot;<br><br>########################################<br><br>ActiveThorns = &quot;AEILocalInterp PUGHInterp PUGHReduce SphericalSurface AHFinderDirect&quot;<br><br>AHFinderDirect::print_timing_stats = &quot;true&quot;<br><br>AHFinderDirect::output_Theta_every = 1<br>AHFinderDirect::h_base_file_name     = &quot;dS.h&quot;<br>AHFinderDirect::Theta_base_file_name = &quot;dS.Theta&quot;<br><br>AHFinderDirect::N_horizons = 1<br>AHFinderDirect::origin_x[1] = 0.0<br>AHFinderDirect::origin_y[1] = 0.0<br>AHFinderDirect::origin_z[1] = 0.0<br><br>AHFinderDirect::initial_guess_method[1] = &quot;coordinate sphere&quot;<br>AHFinderDirect::initial_guess__coord_sphere__x_center[1] =  0.0<br>AHFinderDirect::initial_guess__coord_sphere__y_center[1] =  0.0<br>AHFinderDirect::initial_guess__coord_sphere__z_center[1] =  0.0<br>AHFinderDirect::initial_guess__coord_sphere__radius[1] = 1.0<br><div>------------------------</div>-- <br><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><font face="trebuchet ms, sans-serif" size="4"><b>Luc Combi</b></font></div><div dir="ltr"><div style="font-family:sans-serif"><div style="color:rgb(117,117,117)">CONICET PhD fellow (Buenos Aires, Argentina)<br></div><div style="color:rgb(117,117,117)"><div>Instituto Argentino de Radioastronomía</div></div></div></div></div></div></div></div></div></div></div></div></div></div></div>