scholarly journals Quasinormal Modes of Dirac Field in Generalized Nariai Spacetimes

2020 ◽  
Author(s):  
Joás Venâncio ◽  
Carlos Batista
Keyword(s):  
Quasinormal Modes ◽  
Dirac Field

scholarly journals QUASINORMAL MODES OF RN BLACK HOLE SPACETIME WITH COSMIC STRING IN A DIRAC FIELD

2009 ◽  
Vol 24 (25) ◽  
pp. 2025-2037 ◽  
Author(s):  
R. SINI ◽  
V. C. KURIAKOSE
Keyword(s):  
Black Hole ◽  
Cosmic String ◽  
Quasinormal Modes ◽  
Potential Method ◽  
Dirac Field ◽  
Black Hole Spacetimes ◽  
Black Hole Spacetime ◽  
Field Decay ◽  
Positively Charged ◽  
Small Charge

We evaluate quasinormal mode frequencies for RN black hole spacetimes with cosmic string perturbed by a massless Dirac field, using Pöschl–Teller potential method. We find that only in the case of RN black hole having small charge, the effect due to cosmic string will dominate when perturbed by a negatively charged Dirac field, but if we are perturbing with positively charged Dirac field decay will be less in the case of black hole having cosmic string compared to the RN black hole without string.

scholarly journals DECAY OF SPIN-1/2 FIELD AROUND REISSNER–NORDSTROM BLACK HOLE

2004 ◽  
Vol 13 (06) ◽  
pp. 1105-1118 ◽  
Author(s):  
WEI ZHOU ◽  
JIAN-YANG ZHU
Keyword(s):  
Black Hole ◽  
Scalar Field ◽  
Quantum Number ◽  
Turning Point ◽  
Quasinormal Modes ◽  
Astronomical Observation ◽  
Dirac Field ◽  
Neutrino Field ◽  
Extremal Limit ◽  
Field Decay

To find what influence the charge of the black hole Q will bring to the evolution of the quasinormal modes, we calculate the quasinormal frequencies of the neutrino field (charge e=0) perturbations and those of the massless Dirac field (e≠0) perturbations in the RN metric. The influences of Q, e, the momentum quantum number l, and the mode number n are discussed. Among the conclusions, the most important one is that, at the stage of quasinormal ringing, when the black hole and the field have the same kind of charge (eQ>0), the quasinormal modes of the massless charged Dirac field decay faster than those of the neutral ones, and when eQ<0, the massless charged Dirac field decays slower, which may be helpful in the astronomical observation. In addition, we compare the influence from the charge of the black hole to the spin 1/2 field and scalar field perturbations including the extremal limit (M=Q) and find a turning point of Q exists in both cases. The explanation of this fact is unclear with some suggestions that may be helpful are given.

EFFECT OF COSMIC STRING IN SPHERICALLY SYMMETRIC BLACK HOLE ON THE DIRAC PERTURBATION

2010 ◽  
Vol 25 (02) ◽  
pp. 111-124 ◽  
Author(s):  
R. SINI ◽  
NIJO VARGHESE ◽  
V. C. KURIAKOSE
Keyword(s):  
Black Hole ◽  
Cosmic String ◽  
Oscillation Frequency ◽  
Quasinormal Modes ◽  
Dirac Field ◽  
Spherically Symmetric ◽  
Black Hole Spacetimes ◽  
Quasi Normal Mode ◽  
Symmetric Black Hole ◽  
Sds Black Hole

The effect of cosmic string on the quasinormal modes (QNMs) of massless Dirac field perturbations were studied in different black hole spacetimes. Quasi-normal mode frequencies of massless Dirac field in Schwarzschild, RN extremal, SdS and near extremal SdS black hole spacetimes with cosmic string are obtained using WKB approximation. Our study shows a clear deviation in QNMs due to presence of cosmic string from those in the absence of string. The influence of cosmic string coded in the form of an increase in the oscillation frequency and damping time of QNMs.

scholarly journals Quasinormal modes of a massless Dirac field in de Rham-Gabadadze-Tolley massive gravity

2020 ◽  
Vol 101 (12) ◽  
Author(s):  
Pitayuth Wongjun ◽  
Chun-Hung Chen ◽  
Ratchaphat Nakarachinda
Keyword(s):  
Quasinormal Modes ◽  
Massive Gravity ◽  
Dirac Field ◽  
De Rham

scholarly journals DECAY OF MASSLESS DIRAC FIELD AROUND THE BORN–INFELD BLACK HOLE

2010 ◽  
Vol 25 (04) ◽  
pp. 669-684 ◽  
Author(s):  
SHARMANTHIE FERNANDO
Keyword(s):  
Black Hole ◽  
Spinor Field ◽  
Quasinormal Modes ◽  
Decay Rates ◽  
Nonlinear Parameter ◽  
Sixth Order ◽  
Wkb Approximation ◽  
Dirac Field ◽  
Dirac Spinor ◽  
Linear Counterpart

In this paper we investigate the perturbations by a massless Dirac spinor of a Born–Infeld black hole. The decay rates of the spinor field which is given by the quasinormal mode frequencies are computed using the sixth-order WKB approximation. The behavior of the quasinormal modes with the nonlinear parameter, temperature and charge of the black hole are analyzed in detail. We also compare the decay rates of the Born–Infeld black hole with its linear counterpart Reissner–Nordstrom black hole.

scholarly journals QUASINORMAL MODES AND STABILITY OF A FIVE-DIMENSIONAL DILATONIC BLACK HOLE

2009 ◽  
Vol 18 (09) ◽  
pp. 1441-1459 ◽  
Author(s):  
A. LÓPEZ-ORTEGA
Keyword(s):  
Black Hole ◽  
Linear Stability ◽  
Quasinormal Modes ◽  
Dirac Field ◽  
Dimensional Black Hole ◽  
Klein Gordon ◽  
Dilatonic Black Hole ◽  
Massive Dirac Field

We exactly calculate the quasinormal frequencies of the electromagnetic and Klein–Gordon perturbations propagating in a five-dimensional dilatonic black hole. Furthermore, we exactly find the quasinormal frequencies of the massive Dirac field. Using these results we study the linear stability of this black hole. We compare our results for the quasinormal frequencies and for the linear stability of the five-dimensional black hole with those already published.

scholarly journals Quasinormal modes and greybody factors of the novel four dimensional Gauss–Bonnet black holes in asymptotically de Sitter space time: scalar, electromagnetic and Dirac perturbations

2020 ◽  
Vol 80 (8) ◽  
Author(s):  
Saraswati Devi ◽  
Rittick Roy ◽  
Sayan Chakrabarti
Keyword(s):  
Black Holes ◽  
Cosmological Constant ◽  
Quasinormal Modes ◽  
De Sitter Space ◽  
Dirac Field ◽  
The Novel ◽  
De Sitter ◽  
Third Order ◽  
The Third ◽  
Different Types

Abstract We find the low lying quasinormal mode frequencies of the recently proposed novel four dimensional Gauss–Bonnet de Sitter black holes for scalar, electromagnetic and Dirac field perturbations using the third order WKB approximation as well as Padé approximation, as an improvement over WKB. We figure out the effect of the Gauss–Bonnet coupling $$\alpha $$α and the cosmological constant $$\Lambda $$Λ on the real and imaginary parts of the QNM frequencies. We also study the greybody factors and eikonal limits in the above background for all three different types of perturbations.

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