Valencia from 20 to 22 March 2013
3rd Iberian Gravitational-Wave Meeting 2013

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General programme, activity sheet

Friday 22 March, 2013 18:00 to 18:30 Conference
New results for electromagnetic quasinormal modes of black holes
Speaker: Denitsa Staicova, Sofia University

Authors: Denitsa Staicova, Plamen Fiziev

The differential equations governing the late-time ring-down of the perturbations of the Kerr metric, the Teukolsky Angular Equation and the Teukolsky Radial Equation, can be solved analytically in terms of confluent Heun functions. In this article, for the first time, we use those exact solutions to obtain the electromagnetic (EM) quasinormal spectra of the Kerr black hole . This is done by imposing the appropriate boundary conditions on the solutions and solving numerically the so-obtained two-dimensional transcendental system. The EM QNM spectra are compared with already published results, evaluated through the continued fraction method. The comparison shows that the modes with lower $n$ coincide for both methods, while those with higher $n$ may demonstrate significant deviations. To study those deviations, we employ the $\epsilon$-method which introduces small variations in the argument of the complex radial variable. Using the $\epsilon$-method one can move in the complex $r-$plane the branch cuts of the solutions of the radial equation and examine the dependence of the spectrum on their position. For different values of $\epsilon$, one can obtain both the frequencies evaluated through the well-established continued fraction method or somewhat different spectra calculated here for the first time. This result raises the question what spectrum should be compared with the observational data and why. This choice should come from better understanding of the physics of the problem and it may become particularly important considering the recent interest in the spectra of the electromagnetic counterparts of events producing gravitational waves.
Afternoon Sessions
Place: Salon Grados

Other activities in Afternoon Sessions
17:30 h. to 18:00 h.Conference

Canonical dynamics of variational discrete systems

Speaker: Philipp  Hoehn, Perimeter Institute for Theoretical Physics
16:30 h. to 17:00 h.Conference

Trumpet puncture initial data for black holes on COCAL

Speaker: Takumu Kawamura, University of the Ryukyus, graduate student
17:00 h. to 17:30 h.Coffee break

16:00 h. to 16:30 h.Conference

General Relativistic Resistive Magnetohydrodynamics with Whisky

Speaker: Daniela Alic, Max Planck Institute for Gravitational Physics - Albert Einstein Institute, Postdoc
15:30 h. to 16:00 h.Conference

On the magnetorotational instability in hypermassive neutron stars

Speaker: Daniel Siegel, Max Planck Institute for Gravitational Physics
15:00 h. to 15:30 h.Conference

Gravitational Wave Emission from Magnetized Neutron Stars

Speaker: Riccardo Ciolfi, AEI Potsdam

Organizers, sponsors, collaborators


ADEIT Fundació Universitat Empresa

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