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Showing 1 to 11 of 11 for “"Quasinormal modes"”.
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Quasinormal Modes of Nearly Extremal Black Holes
Quasinormal modes are the gravitational wave analogue to the overtones heard after striking a bell; like many physical systems, black holes emit radiation as a response to perturbations. After a dynamical event, for example a black hole merger, the system is expected to relax to a stationary black …
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PROBING THE NATURE OF COMPACT OBJECTS: SCATTERING, TIDES AND QUASINORMAL MODES
… state. Finally, we study the interplay between quasinormal modes (QNMs) and reflectivity for generic compact objects modeled in the membrane paradigm --- a phenomenological framework that encodes interior structure via a fictitious surface fluid. We extend the phenomenological framework to …
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Leveraging numerical relativity formulations for perturbative analysis: applications to quasinormal modes in general relativity
… In this work, we study two key problems on quasinormal modes of compact objects, as a case study in unifying numerical relativity with perturbation theory. We discuss a new approach for analyzing linearized perturbations of a Schwarzschild black hole using the characteristic formulation of …
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Efficient Iterative Algorithm for Computing Quasinormal Modes of Black Holes and Information Extraction from Black Hole Ringdown Signal
The present work shows how black hole information, such as mass and angular momentum, can be extracted via a new theoretical and computational analysis of the hole's so called <italic>ringdown radiation</italic>, which is a gravitational wave emitted by a freely oscillating black hole.
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Investigations of Black-Hole Spectra: Purely-Imaginary Modes and Kerr Ringdown Radiation
… regime these waves are described in terms of quasinormal modes (QNM). Studying QNM is an important topic which may provide a connection to the quantum theory of gravity in addition to their astrophysical applications. Quasinormal modes correspond to complex frequencies where the real part …
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Modeling the Dynamics of Black Hole Systems and the Ringdown of Black Hole Spacetimes
… Kerr spacetime are a linear superposition of quasinormal modes, and we calculate the amplitude of these mode frequencies as excited by a plunging body. The key result is that the mode amplitudes can be cleanly mapped from kinematic angles describing the plunge geometry. Next, we use this …
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Computing and analyzing gravitational radiation in black hole simulations using a new multi-block approach to numerical relativity
… black holes are presented and the excitation of quasinormal modes is studied in detail. Issues concerning the extraction of gravitational waves from numerical space-times and analyzing them in a systematic way are discussed. A new multi-block infrastructure for solving first order symmetric …
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Transport in a Strongly Coupled Charged Relativistic Quantum Fluid in the Presence of a Chiral Anomaly & a Strong Magnetic Field Via Hydrodynamics & Holography
… theory. I compute the quasinormal modes which are holographically dual to the poles of the two-point functions of the energy-momentum tensor and axial current operators, encoding information about the dissipation and transport of charges in the plasma. I derive general …
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Topological phases, non-equilibrium dynamics and parallels of black hole phenomena in condensed matter
… deals with two broad topics - Majorana modes in Kitaev chain and parallels of black hole phenomena in the quantum Hall effect. Majorana modes in topological superconductors are of fundamental importance as realizations of real solutions to the Dirac equation and for their anyonic …
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Nonsingular and deformed black holes Fundamental aspects and phenomenology
… whose typical frequencies are given by the quasinormal modes of the systems. Under some assumptions,we are able to obtain the Bekenstein-Hawking formula for the entropy and its first, logarithmic correction. Finally, we reinterpret this model in terms of the dual conformal field theory at …
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Advances in Simulating Binary Black Holes
… moments are indeed described by the fundamental quasinormal modes at late times, similar to the ringdown gravitational waves. By including overtones, we also find an excellent quasinormal description of the dominant multipole moment at all times after the merger. This signifies the perhaps …