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16 juin 2025 à 4 juillet 2025
Institut Pascal
Fuseau horaire Europe/Paris

Laura Iacconi, Mapping inflationary loop corrections to boundary terms

26 juin 2025, 12:00
30m
Amphitheater + Cathedrale + Offices (Institut Pascal )

Amphitheater + Cathedrale + Offices

Institut Pascal

Bâtiment 530

Description

Both single- and multi-field models of inflation might lead to enhanced scalar fluctuations on scales much smaller than those seeding the large-scale structure formation. In these scenarios, it is possible that the spike of power at high wavenumber might induce large corrections to the scalar power spectrum, e.g. in the form of loop corrections, potentially endangering the perturbativity of the underlying models. In this talk we discuss recent developments in the calculation of the 1-loop correction to a large-scale adiabatic mode. We demonstrate that non-volume-suppressed corrections only contribute at the boundaries of the momentum integral. To achieve this we employ expansion methods, such as the $\delta N$ formalism, as well as more general expansions that do not rely on assumption of validity of the separate universe picture.

Documents de présentation

Aucun document.