4 papers
Hamiltonian formulation of dust cloud collapse
Nick Kwidzinski, Daniele Malafarina, Jan Ostrowski +2
We consider the gravitational collapse of self-gravitating spherical dust cloud in the Hamiltonian formalism. We address both homogeneous and inhomogeneous cases. Our novel derivat…
A few numbers from the turnaround epoch of collapse
Jan J. Ostrowski
The turnaround epoch of gravitational collapse is examined by means of relativistic Lagrangian perturbation theory. Averaged, scalar equations applied to the fluid's evolution reve…
Does spatial flatness forbid the turnaround epoch of collapsing structures?
Boudewijn F. Roukema, Jan J. Ostrowski
Cosmological observational analysis frequently assumes that the Universe is spatially flat. We aim to non-perturbatively check the conditions under which a flat or nearly flat expa…
The environment-dependence of the growth of the most massive objects in the Universe
Krzysztof Bolejko, Jan J. Ostrowski
This paper investigates the growth of the most massive cosmological objects. We utilize the Simsilun simulation, which is based on the approximation of the silent universe. In the…