82 citations · 369 across the 14 of their papers we have counts for
12 papers · 1 filter
Perihelion precession in spherically symmetric Kaluza-Klein theories
Oystein Elgaroy, Oyvind Gron, Sigbjorn Hervik
We consider the perihelion precession and bending of light in a class of Kaluza-Klein models and show that the "electric redshift" model, proposed in Zhang (2006) to explain the re…
Detection of transplanckian effects in the cosmic microwave background
Nicolaas E. Groeneboom, Oystein Elgaroy
Quantum gravity effects are expected to modify the primordial density fluctuations produced during inflation and leave their imprint on the cosmic microwave background observed tod…
Neutrino Mass, Dark Energy, and the Linear Growth Factor
Angeliki Kiakotou, Oystein Elgaroy, Ofer Lahav
We study the degeneracies between neutrino mass and dark energy as they manifest themselves in cosmological observations. In contradiction to a popular formula in the literature, t…
On using the CMB shift parameter in tests of models of dark energy
Oystein Elgaroy, Tuomas Multamaki
The so-called shift parameter is related to the position of the first acoustic peak in the power spectrum anisotropies of the cosmic microwave background (CMB) anisotropies. It is…
Using the cluster mass function from weak lensing to constrain neutrino masses
Jostein R. Kristiansen, Oystein Elgaroy, Hakon Dahle
We discuss the variation of cosmological upper bounds on , the sum of the neutrino masses, with the choice of data sets included in the analysis, pointing out a few oddities n…
Revised WMAP constraints on neutrino masses and other extensions of the minimal CDM model
Jostein R. Kristiansen, Hans Kristian Eriksen, Oystein Elgaroy
Recently, two issues concerning the three-year WMAP likelihood code were pointed out. On large angular scales (), a sub-optimal likelihood approximation resulted in…
Weighing Neutrinos with Large-Scale Structure
Ofer Lahav, Oystein Elgaroy
While it is established that the effect of neutrinos on the evolution of cosmic structure is small, the upper limits derived from large-scale structure could help significantly to…
Cosmic acceleration and extra dimensions: constraints on modifications of the Friedmann equation
Oystein Elgaroy, Tuomas Multamaki
An alternative to dark energy as an explanation for the present phase of accelerated expansion of the Universe is that the Friedmann equation is modified, e.g. by extra dimensional…
Meissner Effect and Vortex Dynamics in Quark Stars -- A Model for Soft Gamma-Ray Repeaters
R. Ouyed, O. Elgaroy, H. Dahle +1
We present a new model for soft gamma-ray repeaters based on a quark star born with temperatures above the critical value (T_c) for the onset of the colour-flavor locked supercondu…
Can Planck-scale physics be seen in the cosmic microwave background ?
Oystein Elgaroy, Steen Hannestad
We investigate the potential of observations of anisotropies in the cosmic microwave background (CMB) and large-scale structure in the Universe to detect possible modifications of…
Observational constraints on particle production during inflation
Oystein Elgaroy, Steen Hannestad, Troels Haugboelle
Resonant particle production, along with many other physical processes which change the effective equation of state (EOS) during inflation, introduces a step-like feature in the pr…
Features in the primordial power spectrum: constraints from the CMB and the limitation of the 2dF and SDSS redshift surveys to detect them
O. Elgaroy, M. Gramann, O. Lahav
We allow a more general (step-function) form of the primordial power spectrum than the usual featureless power-law Harrison--Zeldovich (with spectral index n=1) power spectrum, and…