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Résumé |
Since the discovery of the Higgs boson 12 years ago, terrestrial particle collider experiments have encountered a slowdown in the quest for physics beyond the Standard Model. Arguably, the upcoming decade promises a paradigm shift towards exploring high-energy physics through cosmological observations. With an abundance of data, independent datasets, and improved systematics, a new era of exploration unfolds. Theorists now strive to attain the precision level demanded by upcoming experiments. In the realm of candidate UV completions to the Standard Model, single-field realizations of inflation appear unlikely. Multifield inflation, nearly as old as inflation itself, is often perceived as having a model-dependent phenomenology, challenging predictability and falsifiability. In this presentation, I will present a modern, model-independent approach to multifield inflationary fluctuations, bypassing the traditional model-by-model exploration. I will delineate the strengths and weaknesses of these effective field theories, comparing their observational predictions to those of the generic class of non-linear sigma models of multifield inflation. |
