PhD student in Observational Cosmology " : “Simulations réalistes pour une cosmologie de précision avec les Supernovae de Type Ia” / “realistic simulations for an accurate Supernova Cosmology" (M/F)
New
- FTC PhD student / Offer for thesis
- 36 mounth
- BAC+3/4
This offer is available in English version
This offer is open to people with a document recognizing their status as a disabled worker.
Offer at a glance
The Unit
Institut de Physique des deux Infinis de Lyon
Contract Type
FTC PhD student / Offer for thesis
Working hHours
Full Time
Workplace
69622 VILLEURBANNE
Contract Duration
36 mounth
Date of Hire
01/04/2026
Remuneration
2300 € gross monthly
Apply Application Deadline : 03 March 2026 23:59
Job Description
Thesis Subject
Cosmological distance measurements from Type Ia Supernovae observations are central to understanding the recent expansion history of the Universe. In recent years, tensions have emerged between the theoretical predictions of the standard cosmological model and measurements of the Universe's expansion. This could indicate new fundamental physics, unless these measurements are skewed by unknown or poorly corrected biases, particularly in distance measurements derived from supernovae.
The main current challenge in this field is: how to correctly infer cosmological parameters given that supernovae vary with their environment and that selection effects impact all our measurements.
To validate the inference model, simulations are essential, but current tools are limited in their ability to describe supernovae in all their complexity. The goal of this PhD is to develop such simulations.
During this PhD, you will contribute to the development of skysurvey (skysurvey.readthedocs.io) to build a new-generation simulation tool.
The successful candidate will be responsible for:
Incorporating models of supernova population evolution.
Validating these models using “volume-limited” data.
Providing the necessary tools for inference pipelines to estimate cosmological parameters.
Accurately assessing the amplitude of astrophysical biases associated with supernova-based cosmological measurements.
This is currently a central issue in the field (Vincenzi et al. 2024). Some of the required volume-limited data are already available (ZTF, Rigault et al. 2025), while the rest will arrive in the next two years with the advent of LSST (currently in commissioning).
Your Work Environment
By joining our team, you will contribute to major discoveries in cosmology within the cosmology group of IP2I (Institut de Physique des 2 Infinis de Lyon), a laboratory of excellence of the CNRS and the Université Claude Bernard Lyon 1. You will be part of two leading international collaborations: LSST (Legacy Survey of Space and Time) and ZTF Cosmology (Zwicky Transient Facility), projects that push back the limits of our understanding of the Universe.
Compensation and benefits
Compensation
2300 € gross monthly
Annual leave and RTT
44 jours
Remote Working practice and compensation
Pratique et indemnisation du TT
Transport
Prise en charge à 75% du coût et forfait mobilité durable jusqu’à 300€
About the offer
| Offer reference | UMR5822-FLOJAC-100 |
|---|---|
| CN Section(s) / Research Area | Interactions, particles, nuclei, from laboratory to cosmos |
About the CNRS
The CNRS is a major player in fundamental research on a global scale. The CNRS is the only French organization active in all scientific fields. Its unique position as a multi-specialist allows it to bring together different disciplines to address the most important challenges of the contemporary world, in connection with the actors of change.
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