246 citations · 886 across the 11 of their papers we have counts for
11 papers
Tachyonic Preheating in Palatini Inflation
Alexandros Karam, Eemeli Tomberg, Hardi Veermäe
We study preheating in the Palatini formalism with a quadratic inflaton potential and an added term. In such models, the oscillating inflaton field repeatedly returns to the…
Did NANOGrav see a signal from primordial black hole formation?
Ville Vaskonen, Hardi Veermäe
We show that the recent NANOGrav result can be interpreted as a stochastic gravitational wave signal associated to formation of primordial black holes from high-amplitude curvature…
Dark Matter and the XENON1T electron recoil excess
Kristjan Kannike, Martti Raidal, Hardi Veermäe +2
We show that the electron recoil excess around 2 keV claimed by the Xenon collaboration can be fitted by DM or DM-like particles having a fast component with velocity of order $\si…
UV Freeze-in in Starobinsky Inflation
Nicolás Bernal, Javier Rubio, Hardi Veermäe
In the Starobinsky model of inflation, the observed dark matter abundance can be produced from the direct decay of the inflaton field only in a very narrow spectrum of close-to-con…
Lower bound on the primordial black hole merger rate
Ville Vaskonen, Hardi Veermäe
We derive a lower bound on the merger rate of primordial black hole (PBH) binaries by estimating the maximal fraction of binaries that were perturbed between formation in the early…
Electromagnetic probes of primordial black holes as dark matter
Y. Ali-Haimoud, S. Clesse, J. Garcia-Bellido +91
The LIGO discoveries have rekindled suggestions that primordial black holes (BHs) may constitute part to all of the dark matter (DM) in the Universe. Such suggestions came from 1)…