Martin Kunz
Dept. Physique Théorique, Univ. Genève (Genève, Suisse)
Amphithéâtre Henri Mineur, Institut d'Astrophysique de Paris
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| « How non-linear is the Universe? » |
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Martin Kunz |
| With the launch of the ESA Euclid satellite only weeks away, we are about to enter a new era of “precision cosmology”. A particular issue here concerns accurate predictions for cosmological observables, particularly if non-linear effects are important. Cosmological N-body simulations are a standard tool for this purpose. After a brief introduction, I will describe how we built the first relativistic N-body code for cosmological simulations, and how we are using it to look at non-linear effects in the Universe. I will in particular highlight the question whether the averaged evolution of the cosmological space-time is impacted by non-linearities, and what can happen when dark energy clustering becomes non-linear in models with low speed of sound. |
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vendredi 9 juin 2023 - 11:00 Amphithéâtre Henri Mineur, Institut d'Astrophysique de Paris |
| Page web du séminaire / Seminar's webpage |