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Reference : UMR7164-NADOKA-002
Workplace : PARIS 13
Date of publication : Thursday, August 08, 2019
Scientific Responsible name : Radoslaw STOMPOR
Type of Contract : PhD Student contract / Thesis offer
Contract Period : 36 months
Start date of the thesis : 1 October 2019
Proportion of work : Full time
Remuneration : 2 135,00 € gross monthly
Description of the thesis topic
The proposed thesis will be performed in the context of the two major on-going CMB experiments, Simons Array and Simons Observatory on which APC researchers collaborate with American and other international partners. These cutting-edge experiments will bring unprecedented volumes of data and reach sensitivity that will allow for setting tight constraints on the physical laws governing the Universe. The main objective of the thesis will be a development of new data analysis techniques suitable for the forthcoming data sets, their application to the actual data set, and participation in the exploitation of their scientific potential. While CMB polarization is one of the most exciting and active areas of modern cosmology, data analysis has matured to become one of the main pillars on which the success of this entire program is hinged.
The specific goal will be a development of novel component separation algorithms designed and optimized for the ground-based data sets, where the number of observational frequencies is limited to a few available atmospheric windows and implementing them in the presence of systematic and instrumental effects typical of ground observations. This is a key step in the CMB data analysis and a new element in the analysis of the ground CMB data with which the forthcoming experiments will have to contend. The smallness of the amplitude of the cosmological signals drives the need for necessary experimental sensitivity, what in turn sets unprecedented requirements on the control and mitigation of instrumental and environmental effects, including the so-called foreground signals generated mostly by our Galaxy. The component separation strives for separating those signals of different origins, based on their physical and statistical properties, and for producing maps of the pristine signal as produced in the early Universe. Later, the student will work on scientific exploitation of those maps and setting novel constraints on cosmology and fundamental physics.
Modern CMB data analysis is a multi-disciplinary effort, involving statistical methods, signal processing, machine learning, high performance scientific computing in addition to physics and cosmology. The student will have an opportunity to collaborate with experts in all those fields, capitalizing on active research collaborations present already established in our laboratories. This will allow the student to develop attractive, broad scientific background and research experience well beyond that of a typical physics thesis, preparing him/her for a future career in diverse contexts. In addition, the student will have opportunity to participate hands-on in the deployment and observational campaigns
The work will be performed at the APC Laboratory within the CMB research group coordinated by drs. R. Stompor and J. Errard. The group is composed at this time of 2 researchers, 4 PhD students, and two postdocs. We collaborate closely with students and researchers from the high performance scientific research and applied statistics groups.
The proposed PhD will be part of the collaborative effort between APC researchers and researchers based at the Physics Department of the University of California at Berkeley (USA) and will be performed under the auspices of a new International Research Unit (UMI), Centre Pierre Binétruy, which is currently being set up between CNRS and UC Berkeley. The student will be supervised jointly by dr. R. Stompor (APC) and prof. A. T. Lee (UCB, Physics Dept.).
The APC Laboratory performs a world level research in theoretical physics, gravitational wave astronomy, neutrino physics, high energy astrophysics and cosmology. The Laboratory is based on the campus of Paris Diderot University in Paris. The code of conduct is defined by the University and CNRS regulations. In particular, our group strictly adheres to equal opportunity and non-discriminatory rules. We value and strive to create an inclusive, friendly and productive environment for all.
Constraints and risks
Collaborative work performed in the context of numerous collaborations of various sizes following time-tables and rules of the collaborations. Regular reporting during weekly collaboration teleconferences.
Scientific research. Publication in refereed, professional journals. Oral communication during conferences and collaboration meetings as well as longer collaborative visits in particular to Berkeley. Regular participation in teleconferences.
The applicant needs to possess a Master 2 degree in Astrophysics, Physics or equivalent, prior to the starting date of the project, have good background physics and general knowledge of cosmology. Experience in data analysis, statistical methods as well as good numerical skills (Python, C, C++, etc) are desirable.
Please do not send applications directly by email, go through the CNRS job portal. For more information, please visit the APC Laboratory website:
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