COSMOS: A numerical relativity code specialized for PBH formation
arXiv:2606.02053 · doi:10.21105/joss.09570
Abstract
Primordial black holes (PBHs) are black holes generated in the early universe without having gone through stellar evolution. In the standard formation process, PBHs are formed from super-horizon primordial fluctuations with non-linearly large initial amplitude. In order to simulate the non-linear gravitational dynamics of PBH formation, one has to rely on numerical relativity solvers to approximate the solution of the Einstein equations. COSMOS is a C++ package for solving the Einstein equations in 3+1 dimensions, providing simple tools for the simulation of PBH formation. In order to resolve the collapsing region, non-Cartesian scale-up coordinates and a fixed mesh-refinement procedure are implemented. In COSMOS, a massless scalar field and a perfect fluid with a linear equation of state are implemented as matter fields. To achieve a practically acceptable computational speed, OpenMP is used for the parallelization. COSMOS has no other dependencies, which makes for an easier installation.
5 pages, 3 figures
References in corpus (16)
- Simulating coalescing compact binaries by a new code SACRA
- Cosmological long-wavelength solutions and primordial black hole formation
- Black holes and fundamental fields in Numerical Relativity: initial data construction and evolution of bound states
- Interaction between bosonic dark matter and stars
- Accretion of dark matter by stars
- Black Hole Universe: Time Evolution
- Threshold of Primordial Black Hole Formation in Nonspherical Collapse
- Robustness of a high-resolution central scheme for hydrodynamic simulations in full general relativity
- Black Hole Universe with
- Primordial black hole formation from massless scalar isocurvature
- Gravitational Collapse of a Massless Scalar Field in a Periodic Box
- 3D Simulation of Spindle Gravitational Collapse of a Collisionless Particle System
- Non-spherical effects on the mass function of Primordial Black Holes
- Simulations of Ellipsoidal Primordial Black Hole Formation
- Black holes and fundamental fields: hair, kicks and a gravitational "Magnus" effect
- Expanding universe with nonlinear gravitational waves