Thesis On Deep Learning For Astrophysics

Universities and Institutes of France

France

October 6, 2022

Description

  • Organisation/Company: CNRS
  • Research Field: Astronomy › Astrophysics Astronomy › Cosmology
  • Researcher Profile: First Stage Researcher (R1)
  • Application Deadline: 06/10/2022 23:59 - Europe/Brussels
  • Location: France › MARSEILLE 13
  • Type Of Contract: Temporary
  • Job Status: Full-time
  • Hours Per Week: 35
  • Offer Starting Date: 01/11/2022
  • Available funding for computer and missions. International collaboration with Italy (Rome, Naples).

    Title : Deep learning for the study of galactic star formation Star formation is a multiscale process that controls the evolution of galaxies. In our Galaxy, available data reveal this process on spatial and temporal scales spanning more than 6 orders of magnitude. This large mass of data, combined with information available on the physical conditions of the medium (density, temperature, turbulence, magnetic field) and numerical simulations, offer the opportunity to establish the link between the properties of the stellar formation and those of the medium which hosts it. More specifically, star formation in galaxies takes place in filamentary structures composed of gas (mainly hydrogen) and dust (small carbonaceous solid particles). These filaments form in the interstellar medium (medium located between stars) and evolve until they fragment to form pre-stellar cores that will house future stars. Although these filaments have been very widely studied, their formation and evolution are still very poorly understood, in part because a comprehensive study of all their evolutionary stages has not yet been carried out. Such a study requires combining the knowledge available on these filaments (data and models). However, the volume and complexity of the data available (in particular the arrangement of multiple views of the data) make this combination inaccessible to “classic” human research. Current approaches, whether based on mathematical morphology, image processing, neural networks, do not integrate physical knowledge and are developed or learned from data alone. However, physical models exist and can be integrated in different ways in the construction of a filament detection method, whether for the construction of artificial data sets by simulation, by the direct integration of knowledge into a neural architecture (a major challenge today) or in the definition of an adequate cost function to favor inferences more faithful to reality (via adversarial strategies for example). The objective of this PhD Thesis is to develop innovative machine learning methods for the detection of filaments. One of the first steps will aim to assess the effectiveness of state-of-the-art methods on large masses of data with a low number of views (two or three wavelengths). The avenues envisaged to go beyond the state of the art consist in particular in the hybridization of deep neural networks and mathematical morphology operators or the development of original neural models operating on graphs. To go further we will study sequential acquisition methods to allow a scaling up of the number of views used to make a decision. Reinforcement algorithms or end-to- end optimizable formalizations can be considered for this. These approaches have the particular advantage of being able to adapt to the case of missing views. The doctoral student will focus on the methodological aspects of machine learning developed for the astrophysical data studied. The preparation of the datasets and the astrophysical knowledge will be provided by the various actors of a larger project in which this PhD Thesis is funded. The student will of course be closely associated with these developments.

    Additional comments

    Important: Recognized experience (project, internship) in Machine Learning / Deep Learning and/or Astrophysics is required to apply for this position. Applications with no experience in any of these areas will not be considered.

    Web site for additional job details

    https: // emploi.cnrs.fr/Offres/Doctorant/UMR7326-ANAMEK-047/Default.aspx

    Required Research Experiences
  • RESEARCH FIELD
  • Astronomy

  • YEARS OF RESEARCH EXPERIENCE
  • None

  • RESEARCH FIELD
  • Astronomy › Astrophysics

  • YEARS OF RESEARCH EXPERIENCE
  • None

  • RESEARCH FIELD
  • Astronomy › Cosmology

  • YEARS OF RESEARCH EXPERIENCE
  • None

    Offer Requirements
  • REQUIRED EDUCATION LEVEL
  • Astronomy: Master Degree or equivalent

  • REQUIRED LANGUAGES
  • FRENCH: Basic

    Contact Information
  • Organisation/Company: CNRS
  • Department: Laboratoire d'Astrophysique de Marseille
  • Organisation Type: Public Research Institution
  • Website: https: // www. lam.fr/
  • Country: France
  • City: MARSEILLE 13
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