PhD Position: Mathematical Physics

Employment

1.0 FTE

Gross monthly salary

€ 3,204 - € 4,051

Required background

Research University Degree

Organizational unit

Faculty of Science

Application deadline

16 September 2026

Are you passionate about mathematical and theoretical physics, and interested in the history and philosophy of physics? Would you like to explore fundamental questions about black holes, entropy and irreversibility? If so, this PhD position could be the perfect opportunity for you.

As a PhD candidate, you will conduct fundamental research on gravitational and holographic systems out of equilibrium. You will be part of both the Department of Mathematics at Radboud University and the Radboud Center for Natural Philosophy (RCNP), where mathematicians, physicists, philosophers and historians work together on foundational questions in the natural sciences, especially in physics.

This PhD position is part of the Origins of Irreversibility projectfunded by the John Templeton Foundation. Your research will focus on the thermodynamics of gravitational systems away from equilibrium, particularly black holes and cosmological horizons. Possible research directions include the dynamical horizon entropy, the Noether charge approach to gravitational entropy, black hole phase transitions, non-equilibrium formulations of thermodynamics, quantum field theory in curved space-time, semiclassical gravity, gravitational path integral, one-loop corrections to horizon entropy, holographic descriptions of dynamical black holes, and holographic heat engines. The precise direction of the project can be adapted to your background and research interests.

The project has a strong conceptual and interdisciplinary component. You will be affiliated with the Radboud Center for Natural Philosophy (RCNP) and will actively participate in its seminars, reading groups and other activities bringing together mathematical physics, theoretical physics, and the history and philosophy of physics. You will also collaborate with other researchers in theOrigins of Irreversibility project and participate in relevant national and international conferences and workshops. Your duties as a teaching assistant in mathematics and mathematical physics will involve approximately 0.2 FTE during the first three years of appointment.

Would you like to learn more about what it’s like to pursue a PhD at Radboud University? Visit the page about working as a PhD candidate.

At Radboud University, I can fully focus on expanding my expertise while learning from my peers and mentors. Noemí Segura-Solé PhD candidate in Microbial Ecology

Noemí Segura-Solé is a PhD candidate in Microbial Ecology.

“After completing my Master’s degree in Norway, I looked at several European universities for a PhD position, including the university where I studied. Then I saw a job opportunity at Radboud University, which aligned perfectly with my interests. After a great first impression of my supervisors during the job interview and positive feedback about Radboud University from my network, I decided to take the leap and move to Nijmegen. It was a risk to leave my Norwegian comfort zone, but I am extremely satisfied with my choice.

From the start, I immediately felt welcomed by the whole department. I have many social interactions with other PhD candidates, and the senior researchers are very approachable and interested in my research. The working conditions for PhD candidates here are also excellent: a good salary, plenty of days off, and flexible working hours. The latter is an added bonus because I already had two children when I started my PhD. Thanks to these factors, I can fully focus on expanding my expertise while learning from my peers and mentors.”

Does this sound like you?

• You are communicative, curious, critical, enthusiastic, proactive and willing to learn.
• You should be able to work in a team as well as independently.
• You should excel in mathematical as well as conceptual reasoning about physics and in doing calculations, and also be able to understand the literature on both mathematical and foundational aspects of physics in depth.
• You hold a Master's degree in mathematics with a strong background in physics (preferably in mathematical physics) or in theoretical physics with a strong mathematical background; or you are on track to obtain a Master's degree before the starting date of the project.
• Further academic qualifications in philosophy are recommended.
• You have a demonstrable interest in the mission of the Radboud Center for Natural Philosophy to improve ties between mathematics, physics, and the history and philosophy of science.
• You possess excellent written and oral English communication skills.

What we offer you

• We will give you a temporary employment contract (1.0 FTE) of 1.5 years, after which your performance will be evaluated. If the evaluation is positive, your contract will be extended by 2.5 years (4-year contract).
• You will receive a starting salary of €3,204 gross per month based on a 38-hour working week, which will increase to €4,051 in the fourth year (salary scale P).
• You will receive an 8% holiday allowance and an 8,3% end-of-year bonus.
• You will receive extra days off. With full-time employment, you can choose between 30 or 41 days of annual leave instead of the statutory 20.

Additional employment conditions

Work and science require good employment practices. Radboud University's primary and secondary employment conditions reflect this. You can make arrangements for the best possible work-life balance with flexible working hours, various leave arrangements and working from home. You are also able to compose part of your employment conditions yourself. For example, exchange income for extra leave days and receive a reimbursement for your sports membership. In addition, you receive a 34% discount on the sports and cultural activities at Radboud University as an employee. And, of course, we offer a good pension plan. We also give you plenty of room and responsibility to develop your talents and realise your ambitions. Therefore, we provide various training and development schemes.

Where you will be working

The Radboud Center for Natural Philosophy was created in 2022 by Spinoza laureate Klaas Landsman. It is a forum for the exchange of ideas across mathematical physics, theoretical physics, philosophy of science, and the history of science. RCNP's general research focuses on determinism, randomness and emergence in modern physics. Members of RNCP include Klaas Landsman, Henk de Regt, Marij van Strien, Kian Salimkhani and Manus Visser, as well as a number of postdoctoral researchers, PhD candidates and students. The JTF grant will enlarge the RCNP with four new postdoctoral researchers and two new PhD candidates, so it will give an enormous boost to the RCNP, including a large visitor programme and several conferences. The daily supervisor for this PhD position is Manus Visser and the main PhD supervisor is Klaas Landsman. You will be encouraged to collaborate with other members of RCNP or other colleagues within and outside Radboud University.

The Department of Mathematics represents a broad range of areas, including pure and applied analysis, mathematical physics, algebraic geometry, noncommutative geometry and number theory. The Department of Mathematics at Radboud University is part of IMAPP, the Institute for Mathematics, Astrophysics and Particle Physics in the Faculty of Science. Within IMAPP, the adjacent departments of High-Energy Physics, including a very strong theory group in classical and quantum gravity with Renate Loll and Badri Krishnan, and Astrophysics, including a world-leading group in black hole imaging with the Event Horizon Telescope originally led by Heino Falcke, are relevant partners in this research project. IMAPP has a friendly and welcoming atmosphere and employs the right balance of junior and senior staff, as well as of Dutch and international researchers, and it organises regular research seminars and informal events.

The Mathematics Department has over 20 PhD candidates, who together organise various academic (PhD colloquium, reading groups) and social activities. IMAPP has on average 45 PhD candidates altogether. PhD candidates at Radboud University are given plenty of opportunities for continuous development, as well as support during their PhD and for finding a job afterwards, both in academia and in industry. Moreover, the PhD Organisation Nijmegen organises educational and social activities, focusing in particular on the well-being of PhD candidates.

Faculty of Science
The Faculty of Science (FNWI), part of Radboud University, engages in groundbreaking research and excellent education. In doing so, we push the boundaries of scientific knowledge and pass that knowledge on to the next generation.

We seek solutions to major societal challenges, such as cybercrime and climate change and work on major scientific challenges, such as those in the quantum world. At the same time, we prepare our students for careers both within and outside the scientific field.

Currently, more than 1,300 colleagues contribute to research and education, some as researchers and lecturers, others as technical and administrative support officers. The faculty has a strong international character with staff from more than 70 countries. Together, we work in an informal, accessible and welcoming environment, with attention and space for personal and professional development for all.

Radboud University
At Radboud University, we aim to make an impact through our work. We achieve this by conducting groundbreaking research, providing high-quality education, offering excellent support, and fostering collaborations within and outside the university. In doing so, we contribute indispensably to a healthy, free world with equal opportunities for all. To accomplish this, we need even more colleagues who, based on their expertise, are willing to search for answers. We advocate for an inclusive community and welcome employees with diverse backgrounds, cultures, and perspectives.

If you want to learn more about working at Radboud University, follow our Instagram account and read stories from our colleagues.

Is this the job for you?

You can apply only via the button below. Address your letter of application to Manus Visser. Please fill in the application form and attach the following documents:

• A letter of motivation in which you describe your academic background, motivation for applying, and potential research interests.
• Your CV, including the names, contact details and email addresses of two academic referees, one of whom should be your Master's thesis supervisor. We will contact your referees if you are shortlisted.
• A transcript of your grades for your Bachelor's and Master's degrees.
• Your Master's thesis, or an equivalent piece of academic writing.

The first interviews will take place on Monday 21 September. Any second interview will take place on Monday 28 September. You will preferably start your employment on 1 October, or later if necessary, but no later than 1 December 2026. We look forward to receiving your application.

We can imagine you're curious about our application procedure. It describes what you can expect during the application procedure and how we handle your personal data and internal and external candidates.

We would like to recruit our new colleague ourselves. Acquisition in response to this vacancy will not be appreciated.

Want to know more about this position?

Dr M.R. Visser (Manus)

Prof. N.P. Landsman (Klaas)

Last modified: 02 September 2026 Share this page