Informations générales
Intitulé de l'offre : Postdoctoral researcher in cosmology (M/F) (H/F)
Référence : UMR7095-GUILAV-007
Nombre de Postes : 1
Lieu de travail : PARIS 14
Date de publication : mercredi 15 octobre 2025
Type de contrat : Chercheur en contrat CDD
Durée du contrat : 36 mois
Date d'embauche prévue : 1 septembre 2026
Quotité de travail : Complet
Rémunération : Between approximately €2,800 and €3,500 gross monthly depending on qualifications
Niveau d'études souhaité : Doctorat
Expérience souhaitée : 1 à 4 années
Section(s) CN : 17 - Système solaire et univers lointain
Missions
You will work within the research group led by G. Lavaux and F. Leclercq, funded by the Simons Foundation's "Learning the Universe" collaboration. As a researcher, you will actively contribute to projects focused on the large-scale structure of the Universe—including galaxy clustering, the cosmic microwave background (CMB), and gravitational shear—by integrating artificial intelligence, Bayesian inference, physical modeling, cosmological simulations, the construction of synthetic galaxy catalogs, and the analysis of observational data from the Euclid mission.
You will also contribute to producing independent and original research within the team, exploring innovative approaches and publishing your findings in peer-reviewed scientific journals.
Activités
The evolution of our Universe is governed by its initial conditions and the physical laws that shape it. However, neither is directly observable. The postdoctoral researcher will contribute to the development of simulation-based Bayesian inference methods, with a focus on cosmological applications. Their responsibilities will include cosmological inference using Euclid's early data releases (DR1/DR2) and robustness testing.
The researcher will join the group of G. Lavaux and F. Leclercq and collaborate closely with members of the "Learning the Universe" project, distributed across international institutes and universities (see learning-the-universe.org), as well as with the Aquila Consortium (aquila-consortium.org).
Applicants shall propose a research project aligned with these scientific goals.
Compétences
Knowledge / Expertise: Physics, cosmology, digital techniques, Bayesian formalism
Practical abilities: Scientific communication (writing papers, presenting at conferences or seminars), High-Performance computing and Machine Learning experience is welcome,
Languages: Professional written and spoken English required; French not mandatory.
Soft skills: Teamwork, respect, scientific integrity, openness to new scientific and technical developments
References: Submit a CV, cover letter, list of publications, and a research proposal of approximately 3 pages. Up to three letter of recommendations may be sent using the link https://shlink.aquila-consortium.org/postdoc-iap-1
Contexte de travail
Located in the heart of Paris, the Institut d'Astrophysique de Paris (IAP) is one of the leading laboratories in cosmology and astrophysics. It brings together over 60 permanent researchers and has a total of around 150 members. The research group "Large-Scale Structures and the Deep Universe," which includes G. Lavaux and F. Leclercq, consists of about twenty permanent researchers specializing in the cosmological analysis of cosmic microwave background data, galaxy surveys (particularly those from the Euclid mission), and the measurement of gravitational lensing effects.
The IAP's research themes cover a broad spectrum of major questions in modern cosmology, ranging from galaxy formation to gravitational wave astrophysics, including models of the primordial Universe.
The postdoctoral researcher will have access to high-performance computational resources, such as the Horizon/Infinity computing cluster (~5,600 CPU cores, ~13 V100/H100 GPUs). The position includes a specific budget for missions (conferences, collaborations, travel) and for acquiring necessary equipment (laptop, software, etc.).
The CNRS has been awarded the European "HR Excellence in Research" label. We are committed to equal opportunities and diversity and encourage applications from diverse backgrounds. All applications will be considered without distinction based on gender, origin, disability, or age.
**Key benefits:**
- 2-year fixed-term contract, renewable for 1 year
- A stimulating work environment in close contact with research staff
- 44 days of annual leave
- Excellent working conditions (flexible hours)
- A company restaurant offering meals at an affordable price
- Partial reimbursement of public transport costs (75%) + sustainable mobility allowance of up to €300/year
- Maternity leave / parental bonus
- A site easily accessible by public transport
- Financial contribution to health insurance costs