3 papers
gr-qc2024
A second-order stochastic effective theory for the long-distance behaviour of scalar fields in de Sitter spacetime
Archie Cable
This thesis introduces an effective theory for the long-distance behaviour of scalar fields in de Sitter spacetime, known as the second-order stochastic theory, with the aim of com…
gr-qc2023
Stochastic parameters for scalar fields in de Sitter spacetime
Archie Cable, Arttu Rajantie
The stochastic effective theory approach, often called stochastic inflation, is widely used in cosmology to describe scalar field dynamics during inflation. The existing formulatio…
astro-ph.CO2023
Spectators no more! How even unimportant fields can ruin your Primordial Black Hole model
Ashley Wilkins, Archie Cable
In this work we terminate inflation during a phase of Constant Roll by means of a waterfall field coupled to the inflaton and a spectator field. The presence of a spectator field m…