Elbereth conference 2024

Session

Session 1

28 févr. 2024, 10:00

Amphithéâtre Henri Mineur (Institut d'Astrophysique de Paris)

37. Detection of exoplanets using low frequencies radio imaging

Quentin Duchêne (LESIA, Observatoire de Paris)

28/02/2024 10:00

Oral presentation

Radio interferometry is a great tool to study Jupiter’s magnetic field, and NenuFAR provides quality low-frequencies observation of it from 10 to 85 MHz. As we expect star-planet interactions from gas giants near to their star to be visible in this range of frequencies, we try to detect them using radio imaging. This should provide useful information and constraints on these planets’ magnetic...

38. Theoretical and numerical study of recurrent dynamics in dynamical systems and application to the N-body problem

Alexandre Prieur (IMCCE, Observatoire de Paris-PSL)

28/02/2024 10:15

Oral presentation

In a famous anagram, Newton wrote that the laws of nature are described by differential equations. However, these equations are not solvable in the general case, in the sense that their solutions cannot be expressed through elementary functions. Stemming from this observation, the theory of dynamical systems aims to determine not the exact state of a system over time, but rather the...

30. Implicit Likelihood Inference in cosmology while checking for survey systematics

Tristan Hoellinger (Institut d'Astrophysique de Paris)

28/02/2024 10:30

Oral presentation

We present methodological advances to perform implicit likelihood inference of cosmology from arbitrarily complex models of cosmological surveys, while efficiently and extensively checking for systematics. This novel approach makes it possible to fully utilise our prior theoretical understanding of the initial matter power spectrum after inflation, in order to investigate the effects of known...

28. Cosmic Shear Nulling: reducing theoretical uncertainties on Dark Energy parameters derived by the Euclid Mission

David Touzeau (CEA Saclay/IPhT)

28/02/2024 10:45

Oral presentation

The Weak Lensing Shear is a powerful probe of cosmology. Along with Galaxy Clustering and the cross-correlation of those two probes, it gives the most effective set of Data, used by cosmological observations, to constrain cosmological parameters and study the large-scale structure of the universe. Yet, the nature of the Dark Energy, representing around 68% of the energy content of our current...