Danielle Leonard
School of Mathematics Statistics and Physics, Newcastle University (Newcastle, Royaume-Uni)
Amphithéâtre Henri Mineur, Institut d'Astrophysique de Paris
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| « Measuring and modelling galaxy intrinsic alignment » |
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Danielle Leonard |
| Characterising dark energy — the mysterious phenomenon driving the accelerating expansion of the Universe — is the holy grail of modern cosmology. Determining its nature using weak gravitational lensing is a primary science goal of Rubin Observatory’s Legacy Survey of Space and Time (LSST), the global flagship ground-based imaging survey due to commence in 2025. To achieve this, we need to control modelling uncertainty on the intrinsic alignment of galaxies — correlations in the observed shapes of galaxies due to local gravitational and astrophysical processes. Intrinsic alignment is believed to be caused by a combination of tidal effects, galaxy evolution, and environment, but the precise physical details are poorly understood. In this talk, I will discuss work toward improving our measurements and modelling of galaxy intrinsic alignment, to enable precision constraints on dark energy with LSST weak lensing. |
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vendredi 19 avril 2024 - 11:00 Amphithéâtre Henri Mineur, Institut d'Astrophysique de Paris |
| Page web du séminaire / Seminar's webpage |