Cara comunidade do IF-UFF, convidamos todos para o colóquio

Data: Terça, 28/10, as 11:00 no auditório da AGIR
Um lanche será servido as 10:45! (tragam suas canecas)

Título:Asymptotic Black Hole Quasinormal Modes and Spectral Instability

Palestrante: Wei-Liang Qian (UNESP)

Resumo: Black hole perturbation theory continues to reveal deep insights intohow gravity responds to disturbance. In this colloquium, we revisit this framework with a focus on two recent developments: asymptotic quasinormal modes and spectral instability. These phenomena not only enrich our understanding of black hole dynamics but also connect to broader questions in gravitational physics. We will discuss how the behavior of high-overtone modes can be derived analytically and how it may hint at an alternative mechanism for generating gravitational wave echoes. By reformulating metric perturbations in terms of discontinuities, we uncover the origin of spectral instability and identify a criterion for its onset in the fundamental mode. Interpreted in light of recent results by Cheung et al., this perspective suggests that instability could be a universal signature of perturbed systems. The talk will conclude with possible observational implications and open questions for future exploration.


Reforçamos o convite a estudantes de graduação, que podem aproveitar as horas
como Atividade Complementar em suas grades.
Atenciosamente,