Hassan
Yes, the Einstein Toolkit can be used for this. In fact, one of the test problems we often use evolves a Gowdy spacetime, i.e. a cosmological setup.
Compared to a regular setup that studies e.g. black holes in an astrophysical context, you would use periodic boundaries, and then set up the initial metric as you desire.
Depending on your level of experience with numerical relativity and the Einstein Toolkit, I would recommend working through one of the tutorials for the Einstein Toolkit and looking at a typical binary black hole coalescence.
-erik
On Sun, Nov 22, 2020 at 7:10 AM Hassan Khalvati hassan.kh92@gmail.com wrote:
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).
Thank you for your time. Regards, Hassan
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Hassan Khalvati Graduate Student Physics Department, Sharif University of Technology Tehran, Iran
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