Sommaire:

Since the discovery of the Higgs boson, particle physics has faced a notable slowdown. Despite initial optimism, subsequent efforts to uncover new particles, like those predicted by supersymmetry or axion dark matter, have yielded limited results. In response to these challenges, this presentation advocates for a paradigm shift toward cosmology as a promising frontier for exploring high-energy physics. The wealth of data, independent datasets, controlled systematics on the observational side, coupled with precise, model-independent and falsifiable predictions on the theoretical side, all constitute invaluable assets. Specifically, this discussion will focus on two facets of precision physics with cosmology: already existing constraints on the primordial power spectra from cosmic microwave background observations, and the possibilities offered by upcoming large-scale-structure experiments to describe primordial non-Gaussianities. These endeavors promise insights into the precise properties of particle content during inflation, heralding a new era of discovery at the intersection of high-energy physics and cosmology.

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