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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…
Closing in on -attractors
Laura Iacconi, Sukannya Bhattacharya, Matteo Fasiello +1
Recent observations of cosmic microwave background (CMB) anisotropies combined with large-scale structure may point towards higher values of the scalar spectral index, . This…
Novel CMB constraints on the parameter in alpha-attractor models
Laura Iacconi, Matteo Fasiello, Jussi Väliviita +1
Cosmological -attractors are a compelling class of inflationary models. They lead to universal predictions for large-scale observables, broadly independent from the functional f…
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,…