Cosmologie

Detection chain readout development and modeling for next-generation Cosmic Microwave Background observations

The precise characterization of the polarized fluctuations of the 3K Cosmic Microwave Background (CMB) appears today to be a major scientific challenge to further progress in the understanding of the primordial Universe. The so-called cosmological B modes in the CMB polarization are thought to have been generated by inflation in the very early Universe and would provide unique information about the origin of the Universe and fundamental laws of physics at very high energies.

International SciPol internship

We are proposing an undergrad internship in lines of the SciPol (scipol.in2p3.fr) European project, focused on CMB data analysis for the discovery of primordial polarized CMB B-modes. 

The intern will focus on the modeling of specific parts of the detection chain (astrophysical foregrounds, atmosphere, instrument, ground pickup, etc.) and will propose a mitigation technique associated to this specific effect. 

Probing Dark Energy with Euclid Cluster Observations

The European Space Agency’s (ESA) Euclid space mission aims to reveal the nature of dark energy, the mysterious cause of the observed accelerated expansion of the universe. Identifying dark energy is arguably the most profound question facing fundamental Physics today, because of its connection between the quantum world and gravity. Euclid will measure the dark energy equation-of-state (EoS), which is to say that it will determine if dark energy is constant or varies with time, a key distinction for theoretical understanding.

SciPol internship (M1)

We are proposing a M1 internship to work on the component separation of the LiteBIRD space mission. It will involve the handling of python codes, CMB and astrophysical signals simulations, as well as the learning of the basics of CMB data analysis. 

This internship would be part of the global effort undertaken by the SciPol project: https://scipol.in2p3.fr/

Exploration and visualisation of fluctuations of cosmic microwave background anisotropies

The objective of the internship is to familiarize the student with modern cosmology and particularly with the physics, informational content, as well as practical applications and observations of the fluctuations of the cosmic microwave background (CMB). The student will explore different observational techniques and approaches used for observations of the CMB and critically compare them. The student will learn to use and compare multiple numerical codes developed by the community in order to generate simulated maps of the CMB sky and explore the impact of beam effects on them.

Cluster cosmology with LSST

Galaxy clusters are the most massive dark matter halos in the Universe. They host galaxies, gas, dust and dark matter.
 
The Legacy Survey of Space and Time (LSST; https://www.lsst.org/about) will detect hundreds of thousands of clusters, which can be used to constraint cosmology and study galaxy evolution. For cluster cosmology the cluster selection function should known with great precision.
 

Cluster cosmology with LSST

Galaxy clusters are the most massive dark matter halos in the Universe. They host galaxies, gas, dust and dark matter.
 
The Legacy Survey of Space and Time (LSST; https://www.lsst.org/about) will detect hundreds of thousands of clusters, which can be used to constraint cosmology and study galaxy evolution. For cosmological study we need a very precise determination of the cluster selection function.
 

Measurement of CMB B-mode polarisation with the LiteBIRD satellite mission: development of innovative data analysis techniques.

The Cosmic Microwave Background (CMB) radiation is a relic emission from 380 000 years after the Big-Bang at the time of decoupling between matter and radiation. The small CMB temperature and polarisation fluctuations, induced by quantum perturbation generated in the early Universe, contain precious information about the physics of the primordial Universe and its physical content. Several experiments, including the Planck satellite mission of ESA have measured those perturbations with high accuracy, leading to per cent precision on the determination of cosmological parameters.

Measurement of CMB B-mode polarisation with the LiteBIRD satellite mission: development of innovative data analysis techniques.

The Cosmic Microwave Background (CMB) radiation is a relic emission from 380 000 years after the Big-Bang at the time of decoupling between matter and radiation. The small CMB temperature and polarisation fluctuations, induced by quantum perturbation generated in the early Universe, contain precious information about the physics of the primordial Universe and its physical content. Several experiments, including the Planck satellite mission of ESA have measured those perturbations with high accuracy, leading to per cent precision on the determination of cosmological parameters.

CMB Foreground Studies

Measurements of the Cosmic Microwave Background (CMB) have transformed cosmology into a precision science, and they continue to deliver new insights into the birth and evolution of our Universe. One of the major hurdles in extracting these insights, however, come from "foreground" signals emitted from intervening matter. These spurious emissions can mask and even mimic the primordial CMB, introducing errors into our conclusions.
Cosmologie