Mr Sergi Sirera
Biography
I joined the ICG in 2021 as a PhD student with an STFC fellowship. Before that I completed the MSc in Quantum Fields and Fundamental Forces at Imperial College London and before that I obtained my undergraduate degree from King's College London in Physics and Philosophy.
Research interests
My research interest lies in theoretical gravity and comsology. I investigate modifications to general relativity and develop frameworks to test them with observations. In the context of gravitational waves, I use black hole perturbation theory to find out what we can learn about the fundamental nature of gravity in the ringdown quasinormal modes. I have written user-freidnly and adaptable Mathematica notebooks including all relevant computations.
I am a member of LIGO.
Research outputs
2025
Inverting no-hair theorems: How requiring general relativity solutions restricts scalar-tensor theories
Sirera, S., Kobayashi, H., Mukohyama, S., Noller, J., Takahashi, K., Yingcharoenrat, V.
16 Jun 2025, In: Physical Review D. 111, 25p., 124022
Research output: Article
Stability and quasinormal modes for black holes with time-dependent scalar hair
Sirera, S., Noller, J.
21 Feb 2025, In: Physical Review D. 111, 21p., 044067
Research output: Article
2023
Testing the speed of gravity with black hole ringdowns
Lahoz, S. S., Noller, J.
28 Jun 2023, In: Physical Review D. 107, 12, 25p., 124054
Research output: Article