121 citations · 407 across the 26 of their papers we have counts for
4 papers · 1 filter
Anatomy of single-field inflationary models for primordial black holes
Alexandros Karam, Niko Koivunen, Eemeli Tomberg +2
We construct an analytically solvable simplified model that captures the essential features for primordial black hole (PBH) production in most models of single-field inflation. The…
Dark Matter-Induced Multi-Phase Dynamical Symmetry Breaking
Kristjan Kannike, Niko Koivunen, Aleksei Kubarski +4
We consider the classically scale invariant Higgs-dilaton model of dynamical symmetry breaking extended with an extra scalar field that plays the role of dark matter. The Higgs bos…
The Linear Regime of Tachyonic Preheating
Niko Koivunen, Eemeli Tomberg, Hardi Veermäe
Tachyonic preheating is realized when the inflaton repeatedly returns to a convex region of the potential during the post-inflationary oscillating phase. This will induce a strong…
Multi-phase critical Higgs boson at colliders
Katri Huitu, Kristjan Kannike, Niko Koivunen +3
The recently proposed multi-phase criticality principle in Coleman-Weinberg models can provide a new explanation for the hierarchy between the electroweak and new physics scales. W…