2 papers
astro-ph.CO2025
Stochastic inflation beyond slow roll: noise modelling and importance sampling
Joseph H. P. Jackson, Hooshyar Assadullahi, Andrew D. Gow +3
We simulate the distribution of very rare, large excursions in the primordial density field produced in models of inflation in the very early universe which include a strong enhanc…
astro-ph.CO2024
The separate-universe approach and sudden transitions during inflation
Joseph H. P. Jackson, Hooshyar Assadullahi, Andrew D. Gow +3
The separate-universe approach gives an intuitive way to understand the evolution of cosmological perturbations in the long-wavelength limit. It uses solutions of the spatially-hom…