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8 papers · 2 filters
Large scale structure simulations of inhomogeneous LTB void models
David Alonso, Juan Garcia-Bellido, Troels Haugboelle +1
We perform numerical simulations of large scale structure evolution in an inhomogeneous Lemaitre-Tolman-Bondi (LTB) model of the Universe. We follow the gravitational collapse of a…
Spherical collapse of dark energy with an arbitrary sound speed
Tobias Basse, Ole Eggers Bjaelde, Yvonne Y. Y. Wong
We consider a generic type of dark energy fluid, characterised by a constant equation of state parameter w and sound speed c_s, and investigate the impact of dark energy clustering…
Sommerfeld Enhancement of DM Annihilation: Resonance Structure, Freeze-Out and CMB Spectral Bound
Steen Hannestad, Thomas Tram
In the last few years there has been some interest in WIMP Dark Matter models featuring a velocity dependent cross section through the Sommerfeld enhancement mechanism, which is a…
Detecting sterile neutrinos with KATRIN like experiments
Anna Sejersen Riis, Steen Hannestad
A sterile neutrino with mass in the eV range, mixing with the electron antineutrino, is allowed and possibly even preferred by cosmology and oscillation experiments. If such eV-mas…
Neutrinos in Non-linear Structure Formation - The Effect on Halo Properties
Jacob Brandbyge, Steen Hannestad, Troels Haugboelle +1
We use N-body simulations to find the effect of neutrino masses on halo properties, and investigate how the density profiles of both the neutrino and the dark matter components cha…
Neutrino and axion hot dark matter bounds after WMAP-7
Steen Hannestad, Alessandro Mirizzi, Georg G. Raffelt +1
We update cosmological hot dark matter constraints on neutrinos and hadronic axions. Our most restrictive limits use 7-year data from the Wilkinson Microwave Anisotropy Probe for t…