Portrait of Jonathan Gräfe

Welcome

I am Jonathan, a PhD student at the Max Planck Institute for Physics in Munich, Germany, in the Quantum Field Theory Group of Johannes Henn. My position is funded by the Max-Planck-IAS-NTU Center for Particle Physics, Cosmology and Geometry. I am also co-supervised by Ivo Sachs at LMU Munich, where I previously did my MSc in Theoretical and Mathematical Physics (joint program with TUM).

My research focuses on the interplay between theoretical high-energy physics and primordial cosmology. In a nutshell, I develop computational methods to find signatures of novel physics in cosmological data from the early universe.

Recent news

04.10.2026

The 19th International Olympiad on Astronomy and Astrophysics 2026 in Hanoi, Vietnam, has officially come to an end. It was a great pleasure to be part of this event as a team leader for the German team, which successfully returns home with one gold and three silver medals.

02.10.2026

My talk 'All Tree-Level Massive Cosmological Correlators from Spectral Gluing' at Cosmology from Home 2026 is now available on YouTube.

18.08.2026

Our paper 'Analytic Continuation of Conformal Integrals in Momentum Space' is now available as a preprint.

Earlier news
20.07.2026

Our paper 'All Tree-Level Massive Cosmological Correlators via Spectral Gluing' is now available as a preprint.

08.07.2026

'Split Representations and Bubble Resummation for Massive de Sitter Correlators' is now officially published in JHEP.

10.02.2026

Our paper 'Split Representations and Bubble Resummation for Massive de Sitter Correlators' is now available as a preprint.

Recent talk

All Tree-Level Massive Cosmological Correlators from Spectral Gluing

How correlators of massive particles in the early universe can be computed from a small set of simple building blocks.

Recorded talk at Cosmology from Home · Watch on YouTube

Upcoming Events

Cosmology from Home, online (21.09.-02.10.2026)

19th International Olympiad on Astronomy and Astrophysics, Hanoi (25.09.-05.10.2026)

Beyond research

Two other things that take up a lot of my time.

IOAA

I participated in many physics competitions as a student and now switched sides: I am one of the main organizers of the German Astronomy Olympiad.

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Archery

Apart from doing physics, I have strong interests in art, literature and - most importantly - sports: I spend the majority of my free time shooting arrows.

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