[NTU String Seminar] Analogous rotating black holes using tunable ultracold atoms: Regge poles and quasinormal modes

• Event Date: 2025-11-14
• Chen, Jhan Yu 陳詹喻
• High Energy Physics and Astrophysics High energy theory
• Speaker: Da-Shin Lee (National Dong Hwa University)  /  Host: Prof. Pei-Ming Ho
  Place: Rm. 815, Dept. of Physics, NTU

Title: [NTU String Seminar] Analogous rotating black holes using tunable ultracold atoms: Regge poles and quasinormal modes
Speaker: Da-Shin Lee (National Dong Hwa University)
Time: 2025/11/14 (Fri.) 14:30
Place: Rm. 815, Dept. of Physics, NTU
 

Abstract

In this talk, I will discuss the use of two-component Bose–Einstein condensates (BECs) and BEC vortices in 1+2 dimensions to construct an analogous model of a rotating black hole surrounded by an environmental mass shell.

I will present the spectrum of Regge poles (RPs), which are the counterparts of quasinormal modes. Bifurcation of the spectrum is observed in the case of the mass shell, resulting in the destabilization of the RPs. I will also discuss the migration of RPs by shifting the bump position. These effects can be observed in the scattering interference pattern in experiments. Next, I will discuss superradiant instabilities resulting from quasibound states with positive mass squared, as well as tachyonic instabilities arising from negative mass squared, in both the frequency and time domains. Our proposed phenomena could potentially be implemented in future experiments, building on the success of recent analogue rotating black hole implementations.

Reference: Phys.Rev.D 112, 064010 (2025), Phys. Rev. D 107, 084049 (2023)