Orateur
Description
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 observed structures of the cosmos e.g. the Cosmic Microwave Background or the Large Scale Structures.
Apart from its manifest interest in the understanding of the first moments of the universe, it is also the best way we know to probe the 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 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 and some massive particles and I will review the kind of 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 which will be the subject of our future work.
| Astrophysics Field | Cosmology |
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