Séminaire Doctorants / Seminar PhD students |
| « A Glimpse of Quantum Particle Production in Cosmology » |
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Arthur Poisson |
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It is well established that the paradigm of cosmological inflation is the correct framework for understanding the physics of the very first moments of our universe. It states that the universe went through a short phase of accelerated expansion in which the microscopic quantum fluctuations of its matter content were stretched to macroscopic scales, becoming the seed for all the cosmos’ observed structures, e.g., the Cosmic Microwave Background or the Large Scale Structures.
Apart from its manifest interest in understanding the universe’s first moments, it is also the best way to probe fundamental physics at very high energies. In particular, the spontaneous production of massive particles due to the expanding background can leave potentially visible imprints in the late time correlation functions known as the cosmological collider signal. In this talk, I will expose a framework that allows one to treat the interactions of the necessary present inflaton field fluctuations with some massive particles and review the processes that can lead to the above-mentioned signal. In particular, the theory features a necessary quadratic mixing which allows flavor oscillations between the two fields. |
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vendredi 18 octobre 2024 - 16:00 Salle des séminaires Évry Schatzman, Institut d'Astrophysique |
| Page web du Séminaire / Seminar's webpage |