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Résumé |
Abstract:
All the information we will ever obtain from the early universe is imprinted in the spatial correlations of primordial fluctuations at the hot Big Bang. I will explain how an influx of ideas from various areas of fundamental physics is providing us with new conceptual and practical tools to decode the physics of these primordial fluctuations. A thorough understanding of the fluctuations will give us insight into particle physics at the highest energies and may provide a window into the nature of spacetime itself.
In these lectures I will review the current status of the theory and phenomenology of cosmological correlators ? the observable which encodes the statistics of primordial fluctuations.
I will give a broad overview of inflationary perturbation theory, the current observational status and future prospects for constraining inflation;
Motivate the EFT perspective on primordial fluctuations, and propose ?cosmological collider physics? as a way to probe the UV completion of inflation;
Explain the various methods to compute cosmological correlators: the in-in formalism, the wavefunction of the universe, and the cosmological bootstrap;
Give a survey of recent theoretical developments that draw inspiration from the scattering amplitude and conformal field theory literature. |
