Common trends in non-Hermitian Physics: Black Holes and Quantum Optics

Contribution List

1. Workshop Introduction

Lionel London, Sarben Sarkar (Department of Physics)

3/24/25, 9:20 AM

Workshop overview

This workshop is funded by the EPSRC (UK) through a grant ''PT symmetric field theory'' held in the Physics Department of King's College London (with Sarben Sarkar as PI). Its role is to relate the study of non-Hermiticity in two areas, black hole physics and quantum optics

9. Input output formalism and other methods in quantum optics of much interest to the black hole community

Dr Almut Beige

3/24/25, 9:35 AM

3. Non-Hermitian Black Hole Physics I

Lionel London

3/24/25, 11:35 AM

4. Non-Hermitian Black Hole Physics II

Dr Rodrigo Panosso Macedo

3/24/25, 12:25 PM

14. Non-hermitian quantum electrodynamics and photon localisation

Dr Almut Beige

3/24/25, 3:30 PM

6. Brainstorming session

3/24/25, 4:35 PM

Review and questions and potential connections from the day's talks

21. The Input output formalism & developments involving nonMarkovian effects I

Sarben Sarkar (Department of Physics)

3/25/25, 9:35 AM

11. Loss of coherence and coherence protection from a graviton bath

Sougato Bose (UCL)

3/25/25, 11:35 AM

10. On the Green's-function approach to deriving balance laws in perturbation theory

Dr Adam Pound

3/25/25, 2:20 PM

12. Rotating black holes in the lab: ringdown and superradiance

Dr Sam Patrick

3/25/25, 3:25 PM

Wave phenomena around spinning black holes can be simulated using rotating draining fluid flows. These are inherently leaky systems due to the presence of a central sink, through which fluid and waves escape. Over the past decade, these simulators have been used to study black hole ringdown and superradiance in the gravity laboratory at the University of Nottingham. In this talk, I will...

13. Brainstorming

3/25/25, 4:35 PM

22. The Input output formalism & developments involving nonMarkovian effects II

Sarben Sarkar (Department of Physics)

3/26/25, 9:30 AM

15. Quasi-normal mode expansions of black hole perturbations: a hyperboloidal Keldysh's approach

Jerem Besson

3/26/25, 10:30 AM

We study asymptotic quasinormal mode expansions of linear fields propagating on a black hole background by adopting a Keldysh scheme for the spectral construction of the resonant expansions. This scheme requires to cast quasinormal modes in terms of a non-selfadjoint problem, something achieved by adopting a hyperboloidal scheme for black hole perturbations. The method provides a spectral...

16. Biorthogonality in quantum mechanics

Dorje Brody

3/26/25, 11:35 AM

18. Merger-ringdown in the self-force approach

Adam Pound

3/26/25, 2:20 PM

17. A new approach in classical Klein-Gordon cosmology

Eleni Kontou (KCL)

3/26/25, 2:55 PM

20. Brainstorming

3/26/25, 4:00 PM

19. Closing Remarks

Lionel London, Sarben Sarkar (Department of Physics)

3/26/25, 5:05 PM