Research Fellowship: Theoretical Physics

Research Fellowship: Theoretical Physics

Geneva, Switzerland TH-2026-1/Cat1 Ideal start date: 01/10/2027

Before 02/11/2026 at 23:59 (Geneva Time)

What you'll do

You will join one of CERN’s theoretical physics research groups, if selected for this Research Fellowship, to develop and lead your own research programme at the frontier of fundamental physics. You will work in a highly collaborative and international environment, contributing to the development of theoretical models, performing analytical and computational research, and advancing the understanding of particle physics and related fields.

You will also be part of CERN’s vibrant scientific community through seminars, workshops, training activities and collaborative projects.

Your responsibilities

• You conduct research in theoretical physics.
• You contribute to CERN’s theoretical physics programme by developing innovative theoretical approaches and advancing the interpretation of experimental results.
• You collaborate with theoretical and experimental physicists on research related to particle physics and fundamental interactions.
• You develop and pursue your own research interests within the framework of the Fellowship.

Still here? Let's make a quick check about

Your profile

• You hold a PhD in theoretical physics or have a scheduled PhD defence before taking up your appointment at CERN.
• You have no more than six years of research experience after completing your PhD.
• You have a strong background in theoretical particle physics or a closely related field.
• You have research experience aligned with the scientific activities carried out within CERN’s Theory Department.
• You are motivated to join a leading international research environment and contribute to high-impact scientific research.
• You are eager to develop and pursue your own research interests within the Fellowship framework.

Your skills

• You have strong analytical and problem-solving skills in the context of theoretical physics.
• You are able to work collaboratively within large, international scientific teams.
• You communicate effectively in a scientific environment, including presenting and discussing research results.
• You can work independently while contributing to shared research objectives and collaborative projects.
• Spoken and written English or French, with a commitment to learn the other language.

Ideal start date: 01/10/2027

Contract duration (in months): 24

Job flexibility: Fully Onsite

Global Benefits at CERN

• A monthly net stipend of either 7004 or 7425 Swiss Francs per month depending on your degree and years of post-graduation experience.
• 30 days of paid leave per year plus 2 weeks annual closure.
• Coverage by CERN’s comprehensive health insurance scheme (for yourself, your spouse and children), and membership of the CERN Pension Fund.
• Family, child and infant monthly allowances depending on your individual circumstances.
• A relocation package (installation grant and travel expenses) depending on your individual circumstances.
• Possibility to extend your contract up to 36 months.
• On-the-job and formal training including language classes.

Let's get you ready

Be sure to meet the eligibility criteria

• By the application deadline, you have a PhD in theoretical physics (or the defense date is already scheduled). In any event, you should have finished your PhD studies by the time you take up your appointment at CERN.
• By the start of your contract, you have no more than 6 years’ research experience after completion of your PhD degree.
• Please note that CERN Staff members are note eligible to apply for a Fellowship.
• Please pay attention to the additional criteria and requirements for this specific position and mentioned above.

You will need these documents to complete your application

• Your CV (English or French)
• A copy of your most relevant diploma or a certificate of achievement from your school (if you don't yet have your paper diploma)
• A statement of research interests highlighting your plans for the research fellowship.
• Three recent letters of recommendation (not older than one year at the application deadline) outlining your academic and/or professional achievements, indicating the professional relationship from the referee to you. After submitting your application, you will receive a submission link to forward to your referees; letters must be uploaded confidentially before the closing date

Your CERNDepartment

The TH department is a center of excellence in theoretical high-energy physics, supporting CERN's experimental programme and fostering global collaboration and education in fundamental research areas.

Overview of CERN

Discover a world where the impossible is made possible!

At CERN, the European Organization for Nuclear Research, we are pushing the frontiers of science and technology. Our groundbreaking work brings together not only physicists but also a diverse range of professionals from engineering, technical, scientific, and administrative fields. Together, we foster an environment where innovation and collaboration thrive.

Every day, we face exciting new challenges and opportunities to contribute to cutting-edge research that shapes our understanding of the universe. We meet these challenges through the diverse perspectives within our teams, ensuring every contribution is valued and driving our shared sense of inclusion and purpose. Diversity is a core value of CERN since its foundation, and it remains central to our mission and continued success.

If you are ready to be part of a dynamic, inclusive community pushing the boundaries of knowledge, CERN is the place where your curiosity and skills can thrive. Be part of our mission to uncover what lies at the heart of the universe! TAKE PART!

Ready To apply?

Be prepared with our resources and tips

• Our Hiring Process
• Life at CERN
• Tips for your Application
• Working at CERN
• What happens after you apply?
• More about CERN

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Apply now Allow 15 minutes to complete your online application

Still have a doubt ? Here are the most frequently asked questions

• What should I expect during my first week at CERN? Your onboarding at CERN includes a comprehensive induction programme, which starts with an official welcome session at the beginning of each month. In addition, you will receive important information both before and after your arrival to ensure a smooth transition into your new role. This process is designed to help you get acquainted with CERN’s environment, your team, and the tools and systems you’ll be using.
• How big would the team be? The size of the team you'll be working with at CERN depends on the specific role and department. Some teams are small and highly specialized, while others are larger and more interdisciplinary. During the interview process, you'll have the opportunity to learn more about the team structure for the position you are applying for.
• What is the working language at CERN? The working languages at CERN are English and French. However, it is not always mandatory to speak both languages to work at CERN. We offer language training to help you acquiring the other language.
• What support does CERN provide for relocation? CERN does not offer direct assistance with relocation. However, depending on your role and specific criteria, you may be eligible for certain benefits such as an installation allowance and coverage of travel expenses to join CERN. These benefits are designed to help ease the transition when relocating to the Geneva area. For more information, please consult the “Salary, Benefits and Support“ page.
• Do I need a visa to work at CERN? Whether you need a visa to work at CERN depends on your nationality and the duration of your stay. CERN assists with the necessary visa and work permit processes for its employees and visitors. The specific requirements will be communicated to you during the recruitment process.
• What would my salary be? Salaries at CERN are determined by a structured scale. Salaries are based on your role, qualifications, and experience, and are not subject to negotiation. Specific details will be provided as your application progresses. For more information, please refer to the dedicated page.