|COOKIES: By using this website you agree that we can place Google Analytics Cookies on your device for performance monitoring.|
Symmetries of Inflation
If you have a question about this talk, please contact Camille Bonvin.
During inflation, time translations are spontaneously broken by the time-dependent matter field. As a result, the conformal symmetries of de Sitter are spontaneously broken and curvature perturbations can be identified with the ``Goldstone boson’’ associated with this symmetry breaking. Taking this point of view, I will explain how the low-momentum physics of curvature perturbations are constrained by symmetries. I will focus the discussion on two aspects. First, I will show how symmetries force curvature perturbations to freeze on super-horizon scales at all orders in a loop expansion. I will then explain how soft limits of inflationary correlation functions can be derived in a model-independent way using Ward identities. In particular, this approach makes manifest how these soft limits are sensitive to the number of light particles during inflation.
This talk is part of the Cosmology lunch series.
This talk is included in these lists:
Note that ex-directory lists are not shown.
Other listsWireless Communications Team Seminars Trinity Mathematical Society ICE Research Seminar Series
Other talksNetworks of Common Asset Holdings: Aggregation and Measures of Vulnerability Inferno XIX, Purgatorio XIX, Paradiso XIX Regenerative medicine solutions for orthopaedic problems Europeanizing Territoriality – Towards Soft Spaces Inferno XXIII, Purgatorio XXIII, Paradiso XXIII Immunotherapy for Human Papillomavirus Infections