140 citations · 1.4k across the 46 of their papers we have counts for
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Second-order cosmological perturbation theory and initial conditions for -body simulations
Adam J. Christopherson, Juan Carlos Hidalgo, Cornelius Rampf +1
We use gauge-invariant cosmological perturbation theory to calculate the displacement field that sets the initial conditions for -body simulations. Using first and second-order…
Effects of Critical Collapse on Primordial Black-Hole Mass Spectra
Florian Kuhnel, Cornelius Rampf, Marit Sandstad
Certain inflationary models as well as realisations of phase transitions in the early Universe predict the formation of primordial black holes. For most mass ranges, the fraction o…
Relativistic perturbations in CDM: Eulerian & Lagrangian approaches
Eleonora Villa, Cornelius Rampf
We study the relativistic dynamics of a pressure-less and irrotational fluid of dark matter (CDM) with a cosmological constant (), up to second order in cosmological perturbatio…
General relativistic corrections to -body simulations and the Zel'dovich approximation
Christian Fidler, Cornelius Rampf, Thomas Tram +3
The initial conditions for Newtonian -body simulations are usually generated by applying the Zel'dovich approximation to the initial displacements of the particles using an init…
How smooth are particle trajectories in a CDM Universe?
Cornelius Rampf, Barbara Villone, Uriel Frisch
It is shown here that in a flat, cold dark matter (CDM) dominated Universe with positive cosmological constant (), modelled in terms of a Newtonian and collisionless fluid, part…