Séminaire / Seminar GReCO |
| « Entanglement, Born-Oppenheimer and primordial non gaussianities » |
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Patrick Peter |
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By consistently applying the rules of quantum mechanics to cosmological systems, one must end up in a multiverse states in which neither the background spacetime nor the inhomogeneous perturbation are in definite states. The usually considered Born-Oppenheimer approximation for which the state is a product of two wave functions (background times perturbation) must be corrected in a way similar to loop corrections in quantum field theory, leading to the inevitable existence of very specific non-Gaussian features (trispectrum) in primordial fluctuations, even for initially purely Gaussian theories. I will present the formalism describing the effect and focus on a specific singularity avoiding bouncing model with a superposition of two universes.
Based on arXiv:2310.16868, 2405.09307 and 2503.14570 |
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lundi 26 mai 2025 - 11:00 Salle des séminaires Évry Schatzman Institut d'Astrophysique de Paris |
| Pages web du séminaire / Seminar's webpage |