Quasinormal Modes and Late-Time Tails in the Background of Schwarzschild Black Hole Pierced by a Cosmic String: Scalar, Electromagnetic and Gravitational Perturbations

Chen, Songbai; Wang, Bin; Su, Rekeng

doi:10.1142/s0217751x08039785

Cited by 11 publications

(4 citation statements)

References 71 publications

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“…For b = 1 case, we obtain the same results given in Ref. 10 where the quasi-normal modes of Schwarzschild black hole perturbed by a massless Dirac field was calculated.…”

Section: Schwarzschild Black Holesupporting

confidence: 80%

“…9 The QNMs of integral spin fields (scalar, electromagnetic and gravitational) perturbations around a Schwarzschild black hole pierced by a cosmic string was done earlier. 10 Most of the studies on the perturbations of black hole background were considered integral spin fields. It is important to study the Dirac field perturbations since it may behave in a different way than the integer spin fields when they propagate in a curved background.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Cosmic String in Spherically Symmetric Black Hole on the Dirac Perturbation

2010

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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.

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“…For b = 1 case, we obtain the same results given in Ref. 10 where the quasi-normal modes of Schwarzschild black hole perturbed by a massless Dirac field was calculated.…”

Section: Schwarzschild Black Holesupporting

confidence: 80%

Section: Introductionmentioning

confidence: 99%

Effect of Cosmic String in Spherically Symmetric Black Hole on the Dirac Perturbation

2010

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“…This deficit angle means that the string-BH solution is not asymptotically flat, which explains how it evades the nohair theorem [107,108]. The deficit angle can also modify the BH's quasi-normal mode spectrum [109,110].…”

Section: Dynamics Of the Loop-pbh Systemmentioning

confidence: 99%

Primordial black holes from cusp collapse on cosmic strings

Jenkins,

Sakellariadou

2020

Preprint

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Primordial black holes (PBHs) are of fundamental interest in cosmology and astrophysics, and have received much attention as a dark matter candidate and as a potential source of gravitational waves. One possible PBH formation mechanism is the gravitational collapse of cosmic strings. Thus far, the entirety of the literature on PBH production from cosmic strings has focused on the collapse of (quasi)circular cosmic string loops, which make up only a tiny fraction of the cosmic loop population. We demonstrate here a novel PBH formation mechanism: the collapse of a small segment of cosmic string in the neighbourhood of a cusp. Using the hoop conjecture, we show that collapse is inevitable whenever a cusp appears on a macroscopically-large loop, forming a PBH whose mass is smaller than that of the loop by a factor of the dimensionless string tension Gµ. Since cusps are generic features of cosmic string loops, and do not rely on finely-tuned loop configurations like circular collapse, this implies that cosmic strings produce PBHs in far greater numbers than has previously been recognised. The resulting PBHs are highly spinning and boosted to ultrarelativistic velocities; they populate a unique region of the BH mass-spin parameter space, and are therefore a "smoking gun" observational signature of cosmic strings. We derive stringent new constraints on Gµ from the evaporation of cusp-collapse PBHs, and update existing constraints on Gµ from gravitational-wave searches.

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“…The QNMFs of a non-rotating Schwarzschild-string black hole have been calculated in refs. [49,50], but not for the case of a Kerr-string black hole with non-zero angular momentum.…”

Section: Introductionmentioning

confidence: 96%

Ringdown spectroscopy of rotating black holes pierced by cosmic strings

Cheung

Poon

Chung

et al. 2021

J. Cosmol. Astropart. Phys.

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Multiple gauge theories predict the presence of cosmic strings with different mass densities Gµ. We derive an equation governing the perturbations of a rotating black hole pierced by a straight, infinitely long cosmic string along its axis of rotation and calculate the quasinormal-mode frequencies of such a black hole. We then carry out parameter estimation on the first detected gravitational-wave event, GW150914, by hypothesizing that there is a string piercing through the remnant, yielding a constraint of Gµ < 3.8 × 10 −3 at the 90% confidence interval with a comparable Bayes factor with a string-less analysis. In contrast to existing studies which focus on the mutual intersection of cosmic strings, or the cosmic string network, our work focuses on the intersection of a cosmic string with a black hole.

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Quasinormal Modes and Late-Time Tails in the Background of Schwarzschild Black Hole Pierced by a Cosmic String: Scalar, Electromagnetic and Gravitational Perturbations

Cited by 11 publications

References 71 publications

Effect of Cosmic String in Spherically Symmetric Black Hole on the Dirac Perturbation

Effect of Cosmic String in Spherically Symmetric Black Hole on the Dirac Perturbation

Primordial black holes from cusp collapse on cosmic strings

Ringdown spectroscopy of rotating black holes pierced by cosmic strings

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