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Uncertainties in primordial black-hole constraints on the primordial power spectrum
Yashar Akrami, Florian Kuhnel, Marit Sandstad
The existence (and abundance) of primordial black holes (PBHs) is governed by the power spectrum of primordial perturbations generated during inflation. So far no PBHs have been ob…
Primordial Black Holes as Dark Matter
Bernard Carr, Florian Kuhnel, Marit Sandstad
The possibility that the dark matter comprises primordial black holes (PBHs) is considered, with particular emphasis on the currently allowed mass windows at - $10^{17}\,…
On Ellipsoidal Collapse and Primordial Black-Hole Formation
Florian Kuhnel, Marit Sandstad
We reinvestigate gravitational ellipsoidal collapse with special focus on its impact on primordial black-hole formation. For a generic model we demonstrate that the abundance and e…
Effects of Critical Collapse on Primordial Black-Hole Mass Spectra
Florian Kuhnel, Cornelius Rampf, Marit Sandstad
Certain inflationary models as well as realisations of phase transitions in the early Universe predict the formation of primordial black holes. For most mass ranges, the fraction o…
Novel aspects of C-theories in Cosmology
Tomi S. Koivisto, David F. Mota, Marit Sandstad
The field equations in FRW background for the so called C-theories are presented and investigated. In these theories the usual Ricci scalar is substituted with whe…
Cosmological constraints on ghost-free bigravity: background dynamics and late-time acceleration
Yashar Akrami, Tomi S. Koivisto, Marit Sandstad
The recent discovery of a ghost-free, non-linear extension of the Fierz-Pauli theory of massive gravity, and its bigravity formulation, introduced new possibilities of interpreting…