S14

Astrophysical foregrounds for precision cosmology

Communauté

Contact : soc_s14@sf2a

Main language for discussions : ENGLISH

The quest for precision cosmology has entered a regime where astrophysical systematic uncertainties increasingly dominate over statistical ones. With the unprecedented sensitivity of upcoming cosmological surveys, astrophysical foregrounds have become the new frontier. They simultaneously complicate the extraction of cosmological information and offer new opportunities to deepen our understanding of the Universe. This session aims to bring together researchers working at the interface of cosmology and astrophysics to discuss the characterization, modeling, mitigation, and scientific exploitation of foreground signals.

Foreground emission arises from a wide range of Galactic and extragalactic structures along the line of sight. In the Milky Way, synchrotron radiation from spiraling electrons and thermal dust emission from the interstellar medium (ISM) dominate. Beyond the Galaxy, radio and infrared point sources, the thermal and kinetic Sunyaev-Zel’dovich effects, gravitational lensing, the cosmic infrared background (CIB), and redshifted molecular lines (e.g., CO) all contribute significant signals.

Building on growing cross-disciplinary efforts within the French community, we propose a session organized around four themes.

Our Galaxy as a foreground
Extragalactic Foregrounds
Disentangling the multi-frequency sky – Component separation methods
Multi-Wavelength Synergies and Joint Inference

We welcome contributions (talks + posters) on any of these four themes. The SOC will seek to bring together experts covering all four themes and to reflect the diversity and dynamism of the French community, including balanced representation across genders and career stages.

Organizing committee : Benjamin Beringue (APC, chair), Clément Leloup (IJCLAB), Adélie Gorce (IAS), Abhishek Maniyar (LAPTh), Margherita Lembo (IAP), Andrea Bracco (LUX), Athanasia Gkogkou (CEA), Giulio Fabbian (IAS)