530 citations · 1.1k across the 10 of their papers we have counts for
6 papers · 1 filter
Axion minicluster power spectrum and mass function
Jonas Enander, Andreas Pargner, Thomas Schwetz
When Peccei-Quinn (PQ) symmetry breaking happens after inflation, the axion field takes random values in causally disconnected regions. This leads to fluctuations of order one in t…
Beyond CDM: Problems, solutions, and the road ahead
Philip Bull, Yashar Akrami, Julian Adamek +37
Despite its continued observational successes, there is a persistent (and growing) interest in extending cosmology beyond the standard model, CDM. This is motivated by a range o…
Scalar instabilities in bimetric gravity: The Vainshtein mechanism and structure formation
Edvard Mortsell, Jonas Enander
We investigate the observational consequences of scalar instabilities in bimetric theory, under the assumption that the Vainshtein mechanism restores general relativity within a ce…
On stars, galaxies and black holes in massive bigravity
Jonas Enander, Edvard Mortsell
In this paper we study the phenomenology of stars and galaxies in massive bigravity. We give parameter conditions for the existence of viable star solutions when the radius of the…
Cosmological viability of massive gravity with generalized matter coupling
Adam R. Solomon, Jonas Enander, Yashar Akrami +3
There is a no-go theorem forbidding flat and closed FLRW solutions in massive gravity on a flat reference metric, while open solutions are unstable. Recently it was shown that this…
Strong lensing constraints on bimetric massive gravity
Jonas Enander, Edvard Mortsell
We derive dynamical and gravitational lensing properties of local sources in the Hassan-Rosen bimetric gravity theory. Observations of elliptical galaxies rule out values of the ef…