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8 papers · 2 filters
Friction in Stochastic Inflation
Baptiste Blachier, Christophe Ringeval
We solve time-reversed stochastic inflation in the semi-infinite flat potential with a constant drift term and derive an exact expression for the probability distribution of the cu…
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…
BaBy Cosmic Tension
Christophe Ringeval
We show that the recently released B-mode polarisation data from the South Pole Telescope (SPT) favour a non-vanishing contribution of primordial gravitational waves of inflationar…
Breaking the Strings: the signatures of Cosmic String Loop Fragmentation
Pierre Auclair
We study the impact of fragmentation on the cosmic string loop number density, using an approach inspired by the three-scale model and a Boltzmann equation. We build a new formulat…
Eternal inflation near inflection points: a challenge to primordial black hole models
Eemeli Tomberg, Konstantinos Dimopoulos
Inflation with an inflection point potential is a popular model for producing primordial black holes. The potential near the inflection point is approximately flat, with a local ma…
Time-reversed Stochastic Inflation
Baptiste Blachier, Christophe Ringeval
Cosmic inflation may exhibit stochastic periods during which quantum fluctuations dominate over the semi-classical evolution. Extracting observables in these regimes is a notorious…