177 citations · 1.4k across the 26 of their papers we have counts for
26 papers
UV artefacts in ultra-slow-roll models of inflation
Gerald Barnert, Laura Iacconi, Hooshyar Assadullahi +2
Within single-field inflation, primordial black hole and scalar-induced gravitational wave production from enhanced primordial perturbations typically requires a transient non-attr…
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…
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…
Non-perturbative non-Gaussianity and primordial black holes
Andrew D. Gow, Hooshyar Assadullahi, Joseph H. P. Jackson +3
We present a non-perturbative method for calculating the abundance of primordial black holes given an arbitrary one-point probability distribution function for the primordial curva…
Observational constraints on interacting vacuum energy with linear interactions
Chakkrit Kaeonikhom, Hooshyar Assadullahi, Jascha Schewtschenko +1
We explore the bounds that can be placed on interactions between cold dark matter and vacuum energy, with equation of state , using state-of-the-art cosmological observations…
Numerical simulations of stochastic inflation using importance sampling
Joseph H. P. Jackson, Hooshyar Assadullahi, Kazuya Koyama +2
We show how importance sampling can be used to reconstruct the statistics of rare cosmological fluctuations in stochastic inflation. We have developed a publicly available package,…