The field of primordial non-Gaussianities is twenty years old. During that time, cosmologists have built a dictionary between the physics active during inflation and higher-order correlation functions of primordial density fluctuations. The speaker will argue that this dictionary is far from complete, with theoretical predictions available only in restricted classes of theories.
To fill in this gap, the speaker will present the cosmological flow, a complete and systematic approach to compute inflationary correlators for all inflationary theories. This enables to assist our theoretical understanding and to generate theoretical data for an unbiased interpretation of upcoming cosmological observations.
He will show that the cosmological collider signal, lying in soft limits of correlators, often described as a robust probe of the field content of inflation, is as robust as its assumptions are restrictive, and he will show its properties in theories involving multiple degrees of freedom, with strong mixing, in the presence of features.
Eventually, he will explain that if equilateral non-Gaussianities are detected, there exists a natural next observational target, the low-speed collider signal, manifesting as a peculiar resonance in mildly-soft kinematical configurations.
時間：2023.06.13(二) 21:00~22:20
頻道：Zoom
講者：Sébastien Renaux-Petel (Institut d'Astrophysique de Paris)
語言：英語
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【此屬轉載訊息，以主事單位發佈為準】
Institut d'Astrophysique de Paris ↹ Paris Institute of Astrophysics, France
“Copernicus Webinar and Colloquium Series”: To promote scientific discussions during this pandemic, they are organizing an online seminar series, i.e. Copernicus Webinar Series, seeking the most outstanding speakers to introduce innovative ideas and important progress in the field of gravity and cosmology. This series is named after the famous Polish Astronomer, Nicolaus Copernicus, whose discovery eventually marked the dawn of modern science.
歐洲核子研究組織CERN
此活動由歐洲核子研究組織CERN主辦。
