scholarly journals Effect of a variable cosmological constant on black hole quasinormal modes

2015 ◽  
Vol 92 (8) ◽  
Author(s):  
Cecilia Chirenti ◽  
Manuela G. Rodrigues
Keyword(s):  
Black Hole ◽  
Cosmological Constant ◽  
Quasinormal Modes ◽  
Variable Cosmological Constant

scholarly journals Regular black holes in de Sitter universe: Scalar field perturbations and quasinormal modes

2015 ◽  
Vol 24 (14) ◽  
pp. 1550104 ◽  
Author(s):  
Sharmanthie Fernando
Keyword(s):  
Black Hole ◽  
Scalar Field ◽  
Cosmological Constant ◽  
Quasinormal Modes ◽  
Massless Scalar ◽  
Massless Scalar Field ◽  
De Sitter ◽  
Regular Black Hole ◽  
Text Mode ◽  
De Sitter Universe

The purpose of this paper is to study quasinormal modes (QNMs) of a regular black hole with a cosmological constant due to scalar perturbations. A detailed study of QNMs frequencies for the massless scalar field was done by varying the parameters of the theory such as mass, magnetic charge, cosmological constant and the spherical harmonic index. We have employed the sixth-order WKB approximation to compute the QNMs frequencies. We have also proved analytically that the [Formula: see text] mode for the massless field reaches a constant value at late times. We have approximated the near-extreme regular-de Sitter (dS) black hole potential with the Pöschl–Teller potential to obtain exact frequencies. The null geodesics of the regular-de Sitter black hole is employed to describe the QNMs frequencies at the eikonal limit ([Formula: see text]).

scholarly journals Quasinormal modes of charged regular black hole

2020 ◽  
pp. 1-5
Author(s):  
L.A. López ◽  
V. Hinojosa
Keyword(s):  
Black Holes ◽  
Black Hole ◽  
Cosmological Constant ◽  
Quasinormal Modes ◽  
Eikonal Approximation ◽  
Charged Black Hole ◽  
Null Geodesics ◽  
Regular Black Hole ◽  
Effective Cosmological Constant

The quasinormal modes (QNMs) of a charged regular black hole are calculated in the eikonal approximation. In the eikonal limit, the QNMs of the black hole are determined by the parameters of unstable circular null geodesics. The behavior of the QNMs are compared with the QNMs of a Reisner–Nordström black hole by fixing some of the parameters that characterize the black holes and varying others. We observed that the parameter that is related to the effective cosmological constant at small distances determines the behavior of the QNMs of a regular charged black hole.

scholarly journals Electromagnetic perturbations of a de Sitter black hole in massive gravity

2017 ◽  
Vol 26 (09) ◽  
pp. 1750100 ◽  
Author(s):  
Sharmanthie Fernando ◽  
Amanda Manning
Keyword(s):  
Black Hole ◽  
Cosmological Constant ◽  
Cross Sections ◽  
High Frequency ◽  
Quasinormal Modes ◽  
Massive Gravity ◽  
De Sitter ◽  
Positive Cosmological Constant ◽  
Frequency Limit ◽  
Electromagnetic Perturbations

The main purpose of this paper is to study quasinormal modes (QNM) of a black hole in massive gravity with a positive cosmological constant due to electromagnetic perturbations. A detailed study of the QNM frequencies for the electromagnetic field is done by varying the parameters of the theory such as the mass, scalar charge, cosmological constant, and the spherical harmonic index. We have employed the sixth-order WKB approximation to calculate the QNM frequencies. The electromagnetic potential for the near extreme massive gravity de Sitter black hole is approximated with the Pöschl–Teller potential to obtain exact frequencies. The null geodesics of the black hole in massive gravity is employed to describe the absorption cross-sections at high-frequency limit.

scholarly journals Significance of black hole quasinormal modes: A closer look

2020 ◽  
Vol 101 (10) ◽  
Author(s):  
Ramin G. Daghigh ◽  
Michael D. Green ◽  
Jodin C. Morey
Keyword(s):  
Black Hole ◽  
Quasinormal Modes

scholarly journals Master equations and quasinormal modes of spin- 3/2 fields in Schwarzschild (A)dS black hole spacetimes

2019 ◽  
Vol 100 (10) ◽  
Author(s):  
Chun-Hung Chen ◽  
Hing-Tong Cho ◽  
Alan S. Cornell ◽  
Gerhard E. Harmsen
Keyword(s):  
Black Hole ◽  
Quasinormal Modes ◽  
Master Equations ◽  
Black Hole Spacetimes

scholarly journals Quasinormal modes of a two-dimensional black hole

2013 ◽  
Vol 45 (11) ◽  
pp. 2239-2250 ◽  
Author(s):  
S. Estrada-Jiménez ◽  
J. R. Gómez-Díaz ◽  
A. López-Ortega
Keyword(s):  
Black Hole ◽  
Quasinormal Modes ◽  
Two Dimensional ◽  
Dimensional Black Hole
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