Extreme astrophysical environments provide rare opportunities to test the fundamental laws of nature under conditions that go beyond the limitations of terrestrial laboratories. In my research, I develop the theory and phenomenology of well-motivated microphysical models. I then use these to identify and -- when relevant -- search for observational signals from new fundamental physics that may be imprinted on astronomical or cosmological observables. 

In the past, much of my research has focused on the cosmology of string compactifications, the theory of inflation, and astronomical signals from axions. I have recently become interested in the implications of cosmological phase transitions in well-motivated extensions of the Standard Model.

My publications can be found here.

I serve as the Vice Director of EuCAPT, the European Consortium for AstroParticle Theory.

Group members

Matteo Zandi, PhD student, 2026 - ...
Aleksandr Chatrchyan, Postdoc, 2025- 2026
Charalampos Nikolis, PhD student, 2024-...

Previous members:

Joshua Eby, Postdoc, 2023-2024
Oindrilla Ghosh, Postdoc, 2023-2025
Pierluca Carenza, Postdoc, 2021-2025
Eike Ravensburg (a.k.a. Müller), PhD student, 2019-2024
Gustavo Salinas, Postdoc, 2021-2023
Theodor Björkmo, PhD student (DAMTP, University of Cambridge), 2016-2019

Positions held

2026:
Professor in theoretical physics, Stockholm University
2024-2026:
Associate Professor and Docent, Stockholm University
2019-2024:      
Assistant Professor, Stockholm University
2015-2019:    
Stephen Hawking Advanced Fellow, University of Cambridge.
2012-2015:    
Postdoc, University of Oxford.
2012:            
Ph.D., Cornell University.
2007:            
M.Sc., Uppsala University.