Dear All,

I hope you are doing well during the COVID19 pandemic.

I want to solve the gr-hydro equations in 3+1 formalism and simulate the black hole formation in the cosmological background (primordial black holes in the radiation dominated universe).

I was wondering to ask if it is possible to do that using the Einstein Toolkit (or potentially the NRPy+) and if anyone could guide me with this problem. 

I guess that the thorns provided with the ET are mostly for the asymptotically flat space-times (if not, correct me please) and I am not sure if it is straightforward to use them considering the FRW metric. 

The formulation I would like to use is based on Shibata and Sasaki's work in 1999 (http://arxiv.org/abs/gr-qc/9905064v1).