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1
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WL-SWG and OU-SHE Me…
WL-SWG and OU-SHE Meeting
September 29, 2025 - October 3, 2025
Laboratoire d'Astrophysique de Marseille
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WaveDiff Technical M…
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2
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WL-SWG and OU-SHE Me…
WL-SWG and OU-SHE Meeting
September 29, 2025 - October 3, 2025
Laboratoire d'Astrophysique de Marseille
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Journal Club + Learn…
Journal Club + Learning Slot
October 2, 2025 10:00 AM - 12:00 PM
Kepler Room
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CosmoStat co-working
CosmoStat co-working
October 2, 2025 13:00 PM - 15:00 PM
Salle Kepler
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CosmoStat Euclid + U…
CosmoStat Euclid + UNIONS WL meeting
October 2, 2025 16:00 PM - 17:00 PM
Salle Kepler
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3
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WL-SWG and OU-SHE Me…
WL-SWG and OU-SHE Meeting
September 29, 2025 - October 3, 2025
Laboratoire d'Astrophysique de Marseille
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4
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5
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6
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Euclid COMB-CL hands…
Euclid COMB-CL hands-on meeting
October 6, 2025 - October 8, 2025
L'Orme des Merisiers
91190 Saint-Aubin, France
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CosmoStat co-working
CosmoStat co-working
October 6, 2025 10:00 AM - 12:00 PM
Salle Kepler
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7
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Euclid COMB-CL hands…
Euclid COMB-CL hands-on meeting
October 6, 2025 - October 8, 2025
L'Orme des Merisiers
91190 Saint-Aubin, France
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CMBX RR2 Hands-on Me…
CMBX RR2 Hands-on Meeting
October 7, 2025 - October 8, 2025
Institut d'Astrophysique de Paris
98 bis Boulevard Arago, 75014 Paris, France
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DAp Seminar Jean-Cha…
DAp Seminar Jean-Charles CUILLANDRE (DAp)
October 7, 2025 10:00 AM - 11:00 AM
Cassini
Science and wonder in Euclid’s colorful Universe
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CosmoStat group meet…
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8
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Euclid COMB-CL hands…
Euclid COMB-CL hands-on meeting
October 6, 2025 - October 8, 2025
L'Orme des Merisiers
91190 Saint-Aubin, France
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CMBX RR2 Hands-on Me…
CMBX RR2 Hands-on Meeting
October 7, 2025 - October 8, 2025
Institut d'Astrophysique de Paris
98 bis Boulevard Arago, 75014 Paris, France
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9
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Joint Journal Club w…
Joint Journal Club with IPhT+DPhP
October 9, 2025 10:00 AM - 11:00 AM
Kepler Room
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JC Seminar: Yun-Hao …
JC Seminar: Yun-Hao Zhang
October 9, 2025 11:00 AM - 12:00 PM
Kepler Room
Title: Bridging Stage III and IV: Advancing Systematics Modelling and Theoretical Predictions for Precision Cosmology with Machine Learning
Abstract:
As upcoming surveys like Euclid and Rubin usher in the era of precision cosmology, accurately modelling both observational systematics and theoretical predictions has become more critical than ever. Recent results from KiDS-Legacy demonstrate that refined treatment of systematics — such as photometric redshift biases — can significantly shift cosmological constraints, bringing them into closer alignment with CMB measurements. This underscores the urgent need for robust and scalable methods to address such effects across the entire inference pipeline. In this talk, I will present a suite of machine-learning-based frameworks designed to strengthen the connection between data and theory in cosmological analyses. I begin with an unsupervised approach using Self-Organising Maps (SOMs) to mitigate spectroscopic incompleteness by augmenting synthetic galaxies, thereby enhancing photometric redshift calibration, fulfilling sub-precent level accuracy for Rubin LSST. I then introduce a generative compression scheme based on Variational Autoencoders (VAEs) for efficient uncertainty marginalisation, alongside a tensorised framework that accelerates angular power spectrum computations using parallel GPU operations, also allows for fully analytic marginalisation. Finally, I will present preliminary work employing symbolic regression models trained on large-scale simulations to enable fast and interpretable predictions of halo statistics. Together, these tools provide more accurate, efficient, and flexible modelling of both observational systematics and theoretical predictions — paving the way for robust science outcomes from Stage IV cosmological surveys.
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CosmoStat co-working
CosmoStat co-working
October 9, 2025 13:00 PM - 15:00 PM
Salle Kepler
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Radio meeting
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CosmoStat Euclid + U…
CosmoStat Euclid + UNIONS WL meeting
October 9, 2025 16:00 PM - 17:00 PM
Salle Kepler
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Image forwed model m…
Image forwed model meeting
October 9, 2025 17:00 PM - 18:00 PM
Rubin room
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11
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12
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13
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Colloque national CM…
Colloque national CMB-France # 7
October 13, 2025 - October 15, 2025
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CosmoStat co-working
CosmoStat co-working
October 13, 2025 10:00 AM - 12:00 PM
Salle Kepler
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14
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Colloque national CM…
Colloque national CMB-France # 7
October 13, 2025 - October 15, 2025
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DAp Seminar Raffaell…
DAp Seminar Raffaella SCHNEIDER (University of Rome, Italy)
October 14, 2025 10:00 AM - 11:00 AM
Cassini
Exploring chemical enrichment in the early Universe
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Staff meeting
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15
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Colloque national CM…
Colloque national CMB-France # 7
October 13, 2025 - October 15, 2025
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WaveDiff Technical M…
WaveDiff Technical Meeting
October 15, 2025 10:00 AM - 11:00 AM
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Fabian's defenc…
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Image forwed model m…
Image forwed model meeting
October 15, 2025 16:00 PM - 17:00 PM
Rubin room
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16
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Journal Club + Learn…
Journal Club + Learning Slot
October 16, 2025 10:00 AM - 12:00 PM
Kepler Room
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CosmoStat co-working
CosmoStat co-working
October 16, 2025 13:00 PM - 15:00 PM
Salle Kepler
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CosmoStat Euclid + U…
CosmoStat Euclid + UNIONS WL meeting
October 16, 2025 16:00 PM - 17:00 PM
Salle Kepler
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17
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18
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19
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20
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CosmoStat co-working
CosmoStat co-working
October 20, 2025 10:00 AM - 12:00 PM
Salle Kepler
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22
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Vilasini's defe…
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Radio meeting
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Image forwed model m…
Image forwed model meeting
October 22, 2025 16:00 PM - 17:00 PM
Rubin room
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23
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Journal Club + Learn…
Journal Club + Learning Slot
October 23, 2025 10:00 AM - 12:00 PM
Kepler Room
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CosmoStat co-working
CosmoStat co-working
October 23, 2025 13:00 PM - 15:00 PM
Salle Kepler
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CosmoStat Euclid + U…
CosmoStat Euclid + UNIONS WL meeting
October 23, 2025 16:00 PM - 17:00 PM
Salle Kepler
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25
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26
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27
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CosmoStat co-working
CosmoStat co-working
October 27, 2025 10:00 AM - 12:00 PM
Salle Kepler
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29
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WaveDiff Technical M…
WaveDiff Technical Meeting
October 29, 2025 10:00 AM - 11:00 AM
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Image forwed model m…
Image forwed model meeting
October 29, 2025 16:00 PM - 17:00 PM
Rubin room
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30
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Journal Club + Learn…
Journal Club + Learning Slot
October 30, 2025 10:00 AM - 12:00 PM
Kepler Room
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CosmoStat co-working
CosmoStat co-working
October 30, 2025 13:00 PM - 15:00 PM
Salle Kepler
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CosmoStat Euclid + U…
CosmoStat Euclid + UNIONS WL meeting
October 30, 2025 16:00 PM - 17:00 PM
Salle Kepler
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