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2023

The Cosmological Flow: A Systematic Approach to Primordial Correlators

Pinol, Lucas, Renaux-Petel, Sébastien, Werth, Denis

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The time evolution of primordial fluctuations conceals a wealth of insights into the high-energy physics at play during the earliest moments of our Universe, which is ultimately encoded in late-time spatial correlation functions.

However, the conventional procedure to compute them is technically challenging, and a complete dictionary mapping the landscape of inflationary theories and the corresponding observable signatures is not yet available.
In this paper, we develop a framework to compute tree-level cosmological correlators based on following their time evolution from their origin as quantum zero-point fluctuations to the end of inflation.
From first principles, the structure of the bulk time evolution imposes a set of universal differential equations in time satisfied by equal-time correlators.

The Cosmological Flow: A Systematic Approach to Primordial Correlators · Around

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