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11 papers · 2 filters
: Cosmological neutrino simulations from the non-linear Boltzmann hierarchy
Jeppe Dakin, Jacob Brandbyge, Steen Hannestad +2
In this paper the non-linear effect of massive neutrinos on cosmological structures is studied in a conceptually new way. We have solved the non-linear continuity and Euler equatio…
General relativistic weak-field limit and Newtonian N-body simulations
Christian Fidler, Thomas Tram, Cornelius Rampf +3
We show how standard Newtonian N-body simulations can be interpreted in terms of the weak-field limit of general relativity by employing the recently developed Newtonian motion gau…
Constraining dynamical neutrino mass generation with cosmological data
S. M. Koksbang, S. Hannestad
We study models in which neutrino masses are generated dynamically at cosmologically late times. Our study is purely phenomenological and parameterized in terms of three effective…
Linear scale bounds on dark matter--dark radiation interactions and connection with the small scale crisis of cold dark matter
Maria Archidiacono, Sebastian Bohr, Steen Hannestad +2
One of the open questions in modern cosmology is the small scale crisis of the cold dark matter paradigm. Increasing attention has recently been devoted to self-interacting dark ma…
Interacting neutrinos in cosmology: exact description and constraints
Isabel M. Oldengott, Thomas Tram, Cornelius Rampf +1
We consider the impact of neutrino self-interactions described by an effective four-fermion coupling on cosmological observations. Implementing the exact Boltzmann hierarchy for in…
Cosmological N-body simulations with generic hot dark matter
Jacob Brandbyge, Steen Hannestad
We have calculated the non-linear effects of generic fermionic and bosonic hot dark matter components in cosmological N-body simulations. For sub-eV masses, the non-linear power sp…