Probe Fundamental Physics via BH Perturbation Theory


Li, D. (2023). Probe Fundamental Physics via BH Perturbation Theory. Perimeter Institute. https://pirsa.org/23100095


Li, Dongjun. Probe Fundamental Physics via BH Perturbation Theory. Perimeter Institute, Oct. 12, 2023, https://pirsa.org/23100095


          @misc{ pirsa_PIRSA:23100095,
            doi = {10.48660/23100095},
            url = {https://pirsa.org/23100095},
            author = {Li, Dongjun},
            keywords = {Strong Gravity},
            language = {en},
            title = {Probe Fundamental Physics via BH Perturbation Theory},
            publisher = {Perimeter Institute},
            year = {2023},
            month = {oct},
            note = {PIRSA:23100095 see, \url{https://pirsa.org}}

Dongjun Li California Institute of Technology (Caltech)

Talk Type Scientific Series


Anticipating the launch of several next-generation gravitational wave (GW) detectors in the 2030s, we will be able to more precisely measure spacetime ripples from binary black hole (BH) mergers in a larger parameter space. The forthcoming data will require us to develop more accurate predictions of GWs not only in General Relativity (GR) but also in theories beyond GR and diverse astrophysical environments. Black hole perturbation theory is a cornerstone for making these predictions. In recent years, there have been extensive studies of perturbations of BHs in theories beyond GR, but only for non-rotating or slowly rotating BHs. In this talk, I will present a new formalism, based on Teukolsky's seminal work in the 1970s, to study perturbations of BHs with arbitrary spin in beyond-GR theories and in more complicated astrophysical environments. I will first discuss how to derive a modified Teukolsky equation for BHs deforming perturbatively from their counterparts in GR due to beyond-GR or environmental effects and the necessary techniques to evaluate this equation. Subsequently, I will discuss some applications of this formalism. Specifically, I will prescribe utilizing this formalism to investigate the isospectrality breaking of quasinormal modes (QNMs) in beyond-GR theories, compute the QNM frequency shifts in some specific theories, and efficiently extract these shifts from observation data. Furthermore, I will also show how to apply this formalism to study extreme mass-ratio inspirals beyond GR.


Zoom link: https://pitp.zoom.us/j/99282316326?pwd=REtBSFUxdlgxUGVwZFFvVEVBVnFTUT09