scholarly journals Branch cut and quasinormal modes at large imaginary frequency in Schwarzschild space-time

2012 ◽  
Vol 86 (2) ◽  
Author(s):  
Marc Casals ◽  
Adrian Ottewill
Keyword(s):  
Quasinormal Modes ◽  
Space Time ◽  
Imaginary Frequency ◽  
Branch Cut

ASYMPTOTIC QUASINORMAL MODES IN EINSTEIN–GAUSS–BONNET GRAVITY

2011 ◽  
Vol 26 (16) ◽  
pp. 2783-2794 ◽  
Author(s):  
J. SADEGHI ◽  
A. BANIJAMALI ◽  
M. R. SETARE ◽  
H. VAEZ
Keyword(s):  
Scalar Field ◽  
Effective Potential ◽  
Quasinormal Modes ◽  
Space Time ◽  
Massive Scalar ◽  
Massive Scalar Field ◽  
Momentum Vector ◽  
Five Dimensions ◽  
Bonnet Gravity ◽  
Temperature Scalar

In this paper we consider a massive scalar field on the boundary of AdS space–time and calculate the quasinormal modes for the string inspired Einstein–Gauss–Bonnet gravity in five dimensions. We study the effects of Gauss–Bonnet parameter, temperature, scalar field's mass and momentum vector on the effective potential and quasinormal modes.

scholarly journals Quasinormal Modes of Charged Black Holes in Higher-Dimensional Einstein-Power-Maxwell Theory

Axioms ◽  
2020 ◽  
Vol 9 (1) ◽  
pp. 33 ◽  
Author(s):  
Grigoris Panotopoulos
Keyword(s):  
Black Holes ◽  
Scalar Field ◽  
Electric Charge ◽  
Quasinormal Modes ◽  
Space Time ◽  
Maxwell Theory ◽  
Charged Black Holes ◽  
Higher Dimensional ◽  
The Impact ◽  
Scalar Perturbations

We compute the quasinormal frequencies for scalar perturbations of charged black holes in five-dimensional Einstein-power-Maxwell theory. The impact on the spectrum of the electric charge of the black holes, of the angular degree, of the overtone number, and of the mass of the test scalar field is investigated in detail. The quasinormal spectra in the eikonal limit are computed as well for several different space-time dimensionalities.

QUASINORMAL FREQUENCIES OF THE RARITA–SCHWINGER FIELD IN REISSNER–NORDSTRÖM-ANTI-DE SITTER SPACE–TIME

2006 ◽  
Vol 15 (06) ◽  
pp. 905-915 ◽  
Author(s):  
YUN ZHANG ◽  
JILIANG JING
Keyword(s):  
Black Hole ◽  
Quasinormal Modes ◽  
De Sitter Space ◽  
Space Time ◽  
Linear Functions ◽  
De Sitter ◽  
The Real ◽  
Large Black Hole ◽  
Angular Quantum Number ◽  
High Overtone

We investigate the quasinormal modes (QNMs) of Rarita–Schwinger field perturbations of a Reissner–Nordström black hole in an asymptotically anti-de Sitter space–time. We find that both the real and imaginary parts of the fundamental quasinormal frequencies of the large black hole are the linear functions of the Hawking temperature. The slope of the lines increases as the charge increases, but the imaginary parts decrease as the charge increases. We show that the quasinormal frequencies become evenly spaced for high overtone number n and the spacings are related to the charge and mass of the black hole. We also find that the real parts of the QNMs increase and the imaginary parts decrease as the angular quantum number increases.

scholarly journals EM Duality and Quasinormal Modes from Higher Derivatives with Homogeneous Disorder

2019 ◽  
Vol 2019 ◽  
pp. 1-19
Author(s):  
Guoyang Fu ◽  
Jian-Pin Wu
Keyword(s):  
Coupling Parameter ◽  
Quasinormal Modes ◽  
Imaginary Frequency ◽  
Higher Derivatives ◽  
Branch Cuts ◽  
Frequency Axis ◽  
Better Than

We study the electromagnetic (EM) duality from 6 derivative theory with homogeneous disorder. We find that, with the change of the sign of the coupling parameter γ1 of the 6 derivative theory, the particle-vortex duality with homogeneous disorder holds better than that without homogeneous disorder. The properties of quasinormal modes (QNMs) of this system are also explored. When the homogeneous disorder is introduced, some modes emerge at the imaginary frequency axis for negative γ1 but not for positive γ1. In particular, with an increase in the magnitude of α^, new branch cuts emerge for positive γ1. These emerging modes violate the duality related to the change of the sign of γ1. With the increase of α^, this duality is getting violated more.

scholarly journals ASYMPTOTIC QUASINORMAL MODES OF A NONCOMMUTATIVE GEOMETRY INSPIRED SCHWARZSCHILD BLACK HOLE

2007 ◽  
Vol 22 (11) ◽  
pp. 2047-2056 ◽  
Author(s):  
PULAK RANJAN GIRI
Keyword(s):  
Black Hole ◽  
Noncommutative Geometry ◽  
Quasinormal Modes ◽  
Space Time ◽  
Hawking Temperature ◽  
Scalar Perturbation ◽  
Schwarzschild Black Hole ◽  
The Real ◽  
Quasinormal Frequency

We study the asymptotic quasinormal modes for the scalar perturbation of the noncommutative geometry inspired Schwarzschild black hole in 3+1 dimensions. We have considered M ≥ M0, which effectively correspond to a single horizon Schwarzschild black hole with correction due to noncommutativity. We have shown that for this situation the real part of the asymptotic quasinormal frequency is proportional to ln (3). The effect of noncommutativity of space–time on quasinormal frequency arises through the constant of proportionality, which is Hawking temperature TH(θ). We also consider the two-horizons case and show that in this case also the real part of the asymptotic quasinormal frequency is proportional to ln (3).

scholarly journals Scalar quasinormal modes of the near extremal Reissner-Nordström black hole in NC space-time

2019 ◽  
Vol 17 (1, spec.issue) ◽  
pp. 43-51
Author(s):  
Marija Dimitrijevic-Ciric ◽  
Nikola Konjik ◽  
Andjelo Samsarov
Keyword(s):  
Black Hole ◽  
Scalar Field ◽  
Gauge Symmetry ◽  
Symmetry Group ◽  
Quasinormal Modes ◽  
Space Time ◽  
Complex Scalar ◽  
Mode Spectrum ◽  
Extremal Limit ◽  
Complex Scalar Field

A way to search for a signal of space-time noncommutativity is to study a quasinormal mode spectrum of the Reissner-Nordstr?m black hole in the presence of noncommutativity. In this paper, we chose a particular NC deformation defined by the angular twist. We investigate a noncommutative (NC) deformation of a complex scalar field, minimally coupled with a classical (commutative) near extremal Reissner-Nordstr?m background. The theory is manifestly invariant under the deformed U(1)* gauge symmetry group. Using the EOM for the NC complex scalar field in RN background, the QNM spectrum is calculated for a particular range of parameters coresponding to the near extremal limit.

scholarly journals Self-force and Green function in Schwarzschild spacetime via quasinormal modes and branch cut

2013 ◽  
Vol 88 (4) ◽  
Author(s):  
Marc Casals ◽  
Sam Dolan ◽  
Adrian C. Ottewill ◽  
Barry Wardell
Keyword(s):  
Green Function ◽  
Quasinormal Modes ◽  
Schwarzschild Spacetime ◽  
Self Force ◽  
Branch Cut
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