"Postdoctoral Fellow in Physics"

About the Department

The Department of Physics is one of the largest departments within the Faculty of Science, supporting a broad range of research in experimental and theoretical physics. It has approximately 250 employees, including 95 PhD students, many of whom have been internationally recruited.

The Department is part of the AlbaNova University Center, which houses the Department of Astronomy, the Physics Departments at KTH Royal Institute of Technology, and the Nordic Institute for Theoretical Physics (Nordita).

Department of Physics

Stockholm University and the Department of Physics are affiliated with the Stockholm Dual Career Network (SDCN), supporting expat partners through professional events, career guidance, and social networking: SDCN.

Project Description

We are seeking a postdoctoral fellow to contribute to the Manticore Digital Twin of the Universe program, developing and applying advanced computational methods to study cosmic structure. The project is funded by a Simons Foundation grant and is part of the international collaboration Learning the Universe (www.learning-the-universe.org), which focuses on reconstructing the initial conditions of our Universe and testing fundamental physics using current and next-generation cosmological surveys.

Possible research directions include:

• Field-level inference and generative modeling of large-scale cosmic structure
• Simulation-based inference, numerical simulations, and neural emulators for accelerated forward modeling
• Advanced data-intensive machine learning and AI techniques for survey analysis
• Applications to major international surveys, including LSST (Rubin Observatory), Euclid, and ZTF

The candidate will join the Simons Collaboration, collaborating with researchers at Columbia University, Lawrence Berkeley National Lab, Harvard University, Flatiron Institute, Institut Astrophysique de Paris, Université de Montréal, Princeton University, Carnegie Mellon University, and MPA Garching.

The position is hosted at the Oskar Klein Centre for Cosmoparticle Physics (OKC), Stockholm, with more than 100 researchers working in astronomy, astrophysics, cosmology, and particle physics. Postdocs are encouraged to participate in Nordita’s Scientific Programs and are members of the Aquila Consortium (www.aquila-consortium.org).

The postdoc will also be part of the Excellence Dark Universe Centre and Technology Enabler (EDUCATE), a collaboration between Stockholm University and KTH to develop next-generation analysis techniques and machine learning methods for dark matter, dark energy, and cosmic structure formation.

We welcome candidates inspired by the intersection of computational technology, numerical simulations, and fundamental physics, with expertise in machine learning, numerical modeling, or both, and who wish to develop innovative methods while advancing our understanding of the Universe.

Main Responsibilities

• Conduct research applying machine learning, data science, and computational methods to study large-scale cosmic structure using cosmological survey data
• Lead visible research projects within international collaborations
• Contribute to methodology development, survey data analysis, and interdisciplinary collaborations
• Participate in ongoing activities at OKC, e.g., DESC/LSST, ZTF, LS4, LHC/ATLAS, ALPHA axion experiment
• Work with cosmological and astroparticle simulations, the BORG field-level inference framework, and the Manticore Digital Twin of the Universe program
• Travel internationally to partner institutions in Europe and the US, as needed

Qualification Requirements

• Swedish doctoral degree or an equivalent degree from another country, completed no later than the employment decision
• Fluency in spoken and written English
• Background in cosmology, statistical inference, machine learning, numerical simulations, or related fields

Assessment Criteria:

• Advantage if the degree was completed within 3 years of the application deadline (older degrees considered under special circumstances)
• Research skills in astrophysics and cosmology, programming, and machine learning

About the Employment

• Employment Type: Temporary, full-time
• Duration: 2–3 years, with possible extension under special circumstances
• Start Date: As soon as possible or by mutual agreement

We Offer

• Work in a dynamic, international research environment at Stockholm University
• Opportunities to work on cutting-edge research in cosmology, astrophysics, and machine learning
• Join the Oskar Klein Centre, collaborating with over 100 researchers and international institutions
• Professional development through seminars, conferences, workshops, and networking
• Supportive and inclusive workplace with equal opportunities for all

Contact

• Associate Professor Jens Jasche
  Phone: +46 8 5537 8037
  Email: jens.jasche@fysik.su.se

Application

Submit your application via Stockholm University’s recruitment system, including:

• Personal letter
• CV
• Required attachments as per the application form

Ensure the application is complete according to the instructions and submitted before the deadline.

Instructions for applicants

• Type of Employment: Temporary position
• Contract Type: Full-time
• Salary: Individual salary setting
• Number of Positions: 1
• Full-Time Equivalent: 100%
• City: Stockholm
• County: Stockholms län
• Country: Sweden
• Reference Number: SU FV-4045-25

Union Representatives:

• ST/OFR: st@st.su.se
• Saco-S: saco@saco.su.se
• Seko: seko@seko.su.se

Published: 13 Nov 2025
Last Application Date: 7 Jan 2026