[astroseminar at Sapienza] Gravity-theory seminar: March 10th 4pm Conversi: Laura Sberna (AEI) - The calm after the storm: the black hole ringdown beyond linear perturbation theory

[Paolo Pani]

Seminar announcement:

*Speaker: *Laura Sberna (AEI, Potsdam)
*Title: *The calm after the storm: the black hole ringdown beyond linear
perturbation theory

*Date:*  Thursday, Mar 10th at 4pm CET
*Location:* Conversi Hall & Zoom (see below)


*Abstract:  *
When a binary merges to form a single black hole, the merger product emits
a final burst of gravitational waves known as the “ringdown”. Ringdowns are
currently being observed with LIGO and Virgo, and will be even stronger in
future detectors like the Einstein Telescope or LISA. Observations of black
hole ringdowns can be used to characterize binary merger remnants, and are
particularly suited to test general relativity.
So far, analyses of the ringdown have assumed *linear* black hole
perturbation theory. In this talk, I will explore *nonlinear* effects
during the ringdown, which could potentially spoil (or enhance) ringdown
analysis. I will focus on one nonlinear process, which we call
"absorption-induced
mode excitation” or AIME.  I will use numerical and analytic techniques to
explore this process first in a toy model in anti-de Sitter, and then in
asymptotically-flat Schwarzschild black holes. Our results so far indicate
that nonlinear effects could play a role in the interpretation of current
and future gravitational wave observations.

The Zoom link is
https://uniroma1.zoom.us/j/86496887581?pwd=aVVRRXd2Z3pBbGZObVhEUjVZWjc0UT09
ID meeting: 864 9688 7581
Passcode: cCUG8j

Cheers,
Paolo

-- 
Paolo Pani
Associate Professor
ERC StG Fellow, DarkGRA project
Junior Fellow, Scuola Superiore di Studi Avanzati Sapienza

Physics Department (Marconi Building), 3rd floor, room 334
Sapienza University of Rome
Piazzale Aldo Moro 5 - 00185 Rome (Italy)
+39 06 4991 4472 (int 24472)
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