Effective field theory of black hole perturbations with timelike scalar profile

Event Date:
2023-04-27T16:00:00
2023-04-27T17:00:00
Event Location:
Henn 318
Speaker:
Prof. Shinji Mukohyama, Yukawa Institute for Theoretical Physics, Kyoto University
URL:
https://ubc.zoom.us/j/67037684029?pwd=MDRWamdBWTdMamNKUmZGQkV3WXEzZz09
Related Upcoming Events:
Gravity Seminars
Intended Audience:
Graduate
Local Contact:

Mervyn Chan (mervync@phas.ubc.ca)

**We welcome everyone to this event, from upper-level undergraduate students, post-docs and faculty to the general public. Come join us!**

Event Information:

TALK RECORDING AVAILABLE AT: https://drive.google.com/file/d/1rCjcB4RkIckHq3anhXzzsKDS8QRsNW4n/view?usp=share_link

Abstract:
Many dark energy (DE) models are based on a scalar field with timelike gradient. In this talk we begin with a review of the systematic construction of the effective field theory (EFT) describing perturbations around the Minkowski background with a timelike scalar profile and its extension to cosmological backgrounds, i.e. the ghost condensation and the EFT of inflation/DE. If one hopes to learn something about the EFT of DE from black holes (BHs) then one needs to consider BH solutions with timelike scalar profiles. We thus extend the EFT to arbitrary backgrounds. Finally, as an application of the general EFT, we study odd-parity perturbations around a spherically
symmetric, static black hole background with a timelike scalar field responsible for DE and compute quasi-normal mode frequencies.

References:
https://arxiv.org/abs/2204.00228;
https://arxiv.org/abs/2208.02943; 

Add to Calendar 2023-04-27T16:00:00 2023-04-27T17:00:00 Effective field theory of black hole perturbations with timelike scalar profile Event Information: TALK RECORDING AVAILABLE AT: https://drive.google.com/file/d/1rCjcB4RkIckHq3anhXzzsKDS8QRsNW4n/view?usp=share_link Abstract: Many dark energy (DE) models are based on a scalar field with timelike gradient. In this talk we begin with a review of the systematic construction of the effective field theory (EFT) describing perturbations around the Minkowski background with a timelike scalar profile and its extension to cosmological backgrounds, i.e. the ghost condensation and the EFT of inflation/DE. If one hopes to learn something about the EFT of DE from black holes (BHs) then one needs to consider BH solutions with timelike scalar profiles. We thus extend the EFT to arbitrary backgrounds. Finally, as an application of the general EFT, we study odd-parity perturbations around a spherically symmetric, static black hole background with a timelike scalar field responsible for DE and compute quasi-normal mode frequencies. References: https://arxiv.org/abs/2204.00228; https://arxiv.org/abs/2208.02943;  Event Location: Henn 318