Speaker
David Mulryne
(Queen Mary University of London)
Description
Taylor expansion methods based on the separate universe approximation, or more general approaches that do not rely on this approximation, can provide insight into the debate on the strength of loop corrections in inflationary models with a large peak. Such a peak is needed for the production of primordial black holes and scalar-induced gravitational waves. In particular, these methods can clearly show how the peak scales decouple from predictions on CMB scales. These methods are also extremely useful for numerical simulations. After reviewing Taylor expansion methods, the codes that implement them, and the debate around loop corrections, I’ll highlight our recent results on the decoupling of scales.