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[Fizinfo] Wigner FK RMI Elméleti Osztály Szemináriuma

From: Balog Janos <balog.janos AT wigner.hu>
To: fizinfo AT lists.kfki.hu, rmkiusers AT lists.kfki.hu
Subject: [Fizinfo] Wigner FK RMI Elméleti Osztály Szemináriuma
Date: Wed, 20 Jan 2021 07:57:55 +0100
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Wigner FK RMI Elméleti Osztály Szemináriuma
Tisztelettel meghívjuk

Jose Luis Jaramillo
(University of Dijon)

"On the stability of black hole quasi-normal modes"

címmel tartandó online szemináriumára.

Az előadás linkje:

Topic: Wigner ELMFO Seminar
Time: Jan 22, 2021 14:00 (room open from 13:30) Budapest
Direct link:
https://cern.zoom.us/j/94782546838?pwd=a0tzTXU1TVU1NW9pY0JzbmVIMFhsQT09
Meeting ID: 947 8254 6838
Passcode: 766139

Kivonat:

In this talk we explore the issue of black hole quasi-normal mode (QNM) instability.
Specifically, by adopting a hyperboloidal approach to QNMs
we cast the QNM problem as an eigenvalue problem for a non-selfadjoint
operator. Such operators suffer potentially of instabilities in their
spectrum and this point is addressed by specific tools in
non-selfadjoint spectral theory, among them the notion of pseudospectrum.
At an exploratory stage prior to the full analytical study,
we adopt here a numerical methodology based on pseudospectral methods.
After studying the Pöschl-Teller potential as a toy model already containing the main features of the discussion, we address the black hole Schwarzschild case. As a result of our analysis, we find strong support to claim: i) the stability of the slowest decaying mode, and ii) the instability of all QNM
overtones. We will conclude with a discussion of the potential implications in astrophysics and fundamental physics.

Helye: online
Ideje: 2021 január 22 péntek d.u. 14:00

Szívesen látunk minden érdeklődőt.

Balog János

[Fizinfo] Wigner FK RMI Elméleti Osztály Szemináriuma, Balog Janos, 01/20/2021
- [Fizinfo] Wigner FK RMI Elméleti Osztály Szemináriuma (Jose Luis Jaramillo), Balog Janos, 01/23/2021
- [Fizinfo] Wigner FK RMI Elméleti Osztály Szemináriuma, Balog Janos, 01/26/2021