2 citations · 2 across the 4 of their papers we have counts for
5 papers
Inflation with the Gauss-Bonnet term in the Palatini formulation
Ali Hassan, Syksy Rasanen
We consider the Gauss-Bonnet term coupled to the inflaton in the Palatini formulation of gravity. Unlike in the metric formulation, the Gauss-Bonnet term is not always a total deri…
Effect of stochastic kicks on primordial black hole abundance and mass via the compaction function
Sami Raatikainen, Syksy Rasanen, Eemeli Tomberg
We study stochastic effects in viable ultra-slow-roll inflation models that produce primordial black holes. We consider asteroid, solar, and supermassive black hole seed masses. In…
Inflation with the Chern-Simons term in the Palatini formulation
Ali Hassan, Syksy Rasanen
We consider the Chern--Simons term coupled to the inflaton in the Palatini formulation of general relativity. In contrast to the metric formulation, here the Chern--Simons term aff…
The effect of matter discreteness on gravitational wave propagation in post-geometrical optics
Sena Atli, Syksy Rasanen
The gravitational wave equation of motion includes direct coupling to the Riemann tensor. The curvature terms are usually neglected, but they can be large at the location of matter…
Primordial black hole compaction function from stochastic fluctuations in ultra-slow-roll inflation
Sami Raatikainen, Syksy Rasanen, Eemeli Tomberg
We study the formation of primordial black holes (PBH) with ultra-slow-roll inflation when stochastic effects are important. We use the formalism and simplify the stochastic…