Staff profile

I am a PhD student in the Centre for Particle Theory group (CPT) based in the Mathematical Sciences department. Originally from County Durham, I studied theoretical physics at the University of St Andrews before starting my PhD here at Durham. 

My research, supervised by Professor Arthur Lipstein, focuses primarily on developing new ways of computing quantities which arise due to quantum fluctuations during inflation: a period in the very early universe in which space was expanding exponentially. These quantities can be related (by other people) to things that we can observe in the universe today, giving us some insight into the first fractions of a second after the big bang.More technically, I mainly compute in-in correlators on the future boundary of de Sitter space, in particular doing so via "dressing rules" that we have developed which allow one to lift flat-space amplitudes directly to dS.

As a Durham Doctoral Teaching Fellow, I also spend one third of my time as a member of the Maths Education and Pedagogy group. I therefore have some teaching responsibilities, and help out with the running of some modules in the department. Additionally, I am currently one of the organisers for the Pedagogy group seminar series. If you would be interested in giving a talk to the group, please get in touch!

• Inflationary/Quantum Cosmology
• (A)dS/CFT
• Amplitudes

Journal Article

• Cosmological dressing rules
  
  Chowdhury, C., Lipstein, A., Marshall, J., Mei, J., & Sachs, I. (2026). Cosmological dressing rules. Journal of High Energy Physics, 2026(3), Article 76. https://doi.org/10.1007/JHEP03%282026%29076