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PhD thesis on novel data analysis techniques for the CMB space mission, LiteBIRD (H/F).

This offer is available in the following languages:
Français - Anglais

Date Limite Candidature : jeudi 12 août 2021

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General information

Reference : UMR7164-RADSTO-002
Workplace : PARIS 13
Date of publication : Thursday, July 22, 2021
Scientific Responsible name : Radek Stompor
Type of Contract : PhD Student contract / Thesis offer
Contract Period : 36 months
Start date of the thesis : 1 October 2021
Proportion of work : Full time
Remuneration : 2 135,00 € gross monthly

Description of the thesis topic

We are looking for a prospective PhD student interested in working on a thesis in the area of observational cosmology focused on developing techniques and tools suitable for the analysis of the next generation of the cosmic microwave background polarised anisotropy experiments. The specific target of the proposed thesis is the satellite mission, LiteBIRD, aiming at the detection of the so-called B-mode signature of the polarization pattern, which could provide a tantalising evidence for existence of the primordial gravitational waves.
The proposed PhD thesis will consist in:
(1) developing novel component separation techniques necessary to remove signals of non-cosmological origins, such as emissions due to our own Galaxy, and which will be suitable for the B-mode science and will account for the presence of instrumental effects (as motivated by the LiteBIRD mission); 
(2) implementing these techniques in a form of numerically efficient well-documented codes; 
(3) demonstrating and validating them on advanced simulated data implementing cutting-edge models of the galactic foregrounds physics and real data sets coming from ground-based efforts, such as the Simons Array and Simons Observatory; 
(4) turning these techniques in software tools, permitting efficient optimization and validation of the instrumental designs;
(5) validating on and applying them to the optimization and design of the satellite project, LiteBIRD. LiteBIRD is an international project, led by JAXA, which is in Phase A at JAXA and CNES. It is designed to have both a very sensitive focal plane and an exquisite control of instrumental systematic effects. Its launch is planned for 2027, and it will observe the whole sky over 3 years. This thesis will contribute directly to design and optimization of the LiteBIRD instrument ensuring that the mission will be capable of reaching its ambitious science goals. Using the formalism developed here we will set up requirements for the precision of calibration of different elements of the detection chain.

Work Context

The thesis work will be performed at the AstroParticule et Cosmologie (APC) Laboratory based on the Paris Rive Gauche campus in the 13th arrondissement of Paris. The successful candidate will become part of the Cosmology group at the laboratory and work closely with the research group led by drs. R. Stompor and J. Errard which composed of two PhD students and a postdoctoral researcher.
The thesis will be performed in the context of the French involvement in the LiteBIRD mission and will strengthen contributions of the APC team, who has been playing very visible roles in the LiteBIRD collaboration on the European and global mission levels. The work involves participation in frequent and regular telecons and giving periodic progress reports.
The position offers opportunities for extended visits to the University of California at Berkeley as well as Japan. There will be also opportunity to get involved in some of the leading ground-based experiments, such as Simons Observatory and CMB-S4.
The candidates need to have a Master degree in cosmology or physics, good understanding of modern cosmology, solid background in statistics and numerical methods, as well as basic programming skills.
The monthly salary is on the level of ~2135 Euros (before taxes and deductions).

Constraints and risks

No specific risks identified.

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