532 citations · 11.7k across the 196 of their papers we have counts for
9 papers · 1 filter
Neutrino mass bounds from cosmology
Steen Hannestad
Cosmology is at present one of the most powerful probes of neutrino properties. The advent of precision data from the cosmic microwave background and large scale structure has allo…
Structure formation with strongly interacting neutrinos - implications for the cosmological neutrino mass bound
Steen Hannestad
We investigate a model where neutrinos are strongly coupled to a new, light scalar field. In this model neutrinos annihilate as soon as they become non-relativistic in the early un…
Cosmological bounds on masses of neutrinos and other thermal relics
Steen Hannestad
With the advent of precision data, cosmology has become an extremely powerful tool for probing particle physics. The prime example of this is the cosmological bound on light neutri…
Searching for a holographic connection between dark energy and the low-l CMB multipoles
Kari Enqvist, Steen Hannestad, Martin S. Sloth
We consider the angular power spectrum in a finite universe with different boundary conditions and perform a fit to the CMB, LSS and supernova data. A finite universe could be the…
Cosmological constraints on the dark energy equation of state and its evolution
Steen Hannestad, Edvard Mortsell
We have calculated constraints on the evolution of the equation of state of the dark energy, w(z), from a joint analysis of data from the cosmic microwave background, large scale s…
A First Glimpse of String Theory in the Sky?
Steen Hannestad, Laura Mersini-Houghton
We propose a new method for identifying new physics imprints on present observational data in cosmology whereby signatures of string theory are clearly distinguished from imprints…