Tidal disruption near black holes and their mimickers

Banerjee, Pritam; Paul, Suvankar; Shaikh, Rajibul; Sarkar, Tapobrata

doi:10.48550/arxiv.1912.01184

Cited by 4 publications

(4 citation statements)

References 22 publications

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“…The huge array of ECOs which are horizonless include gravastars [43,44], boson stars [45][46][47], quasiblack holes [41,48,49], fuzzballs [50,51] and also wormholes [39,52,53]. For wormholes, there has been numerous studies where different aspects of such spacetimes have been looked at for their ability to mimic the behavior of a black hole [39,[54][55][56][57]. We will be particularly interested in the ringdown behavior of the wormholes involving their quasi-normal mode spectrum [39,53,[58][59][60].…”

Section: Introductionmentioning

confidence: 99%

Novel triple barrier potential for axial gravitational perturbations of a family of Lorentzian wormholes

Roy

2022

Eur. Phys. J. C

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We study the behavior of a specific Lorentzian wormhole family under gravitational perturbations. In earlier work (EPJC 80:850, 2020), we have proved the stability of a test scalar field in the background of the wormhole family, where the effective potential was that of a double barrier. Continuing with the stability analysis, here we focus on the more physically relevant scenario, that of axial gravitational perturbations. Interestingly, we find that the effective potential is a triple barrier for lower angular momentum modes. This raises important questions on the ringdown of the corresponding wormhole geometry as well as the gravitational wave echo profile that we try to answer through our work. We study in detail how the geometry of each member wormhole affects the quasinormal modes, the time evolution of the signal as well as echoes which are, in general, very feeble in comparison to the main signal. Different ‘cleaning’ techniques have been used to obtain the echo profile in the time evolution of the signal. Lastly, we dwell on the possibility of our wormhole family as a candidate black hole mimicker, as long as its stability is proven under all kinds of perturbations. We briefly present a comparison of the ringdown characteristics of these wormholes with that of a black hole, in support of this speculation.

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Section: Introductionmentioning

confidence: 99%

Novel triple barrier potential for axial gravitational perturbations of a family of Lorentzian wormholes

Roy

2022

Eur. Phys. J. C

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“…These objects have been extensively studied in the literature, indeed there are many authors, who not only built up new WH solutions, both in General Relativity (GR) and in Alternative Gravity, but they were also interested in analysing their properties [2][3][4][5][6][7][8]. On the other hand, there is also a major research effort in conceiving original astrophysical strategies to search for WH observational signatures [9][10][11][12][13][14][15][16][17][18][19]. This research topics is strongly motivated not only by the presence of several complementary data, but also because there is the great opportunity to perform, now and in the near-future, highly-precise observations in strong field regimes.…”

Section: Introductionmentioning

confidence: 99%

Epicyclic frequencies in static and spherically symmetric wormhole geometries

Falco

Capozziello

2021

Phys. Rev. D

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The measurement of the epicyclic frequencies is a widely used astrophysical technique to infer information on a given self-gravitating system and on the related gravity background. We derive their explicit expressions in static and spherically symmetric wormhole spacetimes. We discuss how these theoretical results can be applied to: (1) detect the presence of a wormhole, distinguishing it by a black hole; (2) reconstruct wormhole solutions through the fit of the observational data, once we have them. Finally, we discuss the physical implications of our proposed epicyclic method.

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“…This can be one of the reasons why no observational evidence of their existence has been found so far. To this end, there are international efforts in providing feasible observational procedures to detect their signature, like: analysing the quasinormal-mode spectrum in the gravitational wave emission [17,18]; producing numerical images of a thin accretion disk forming around WHs [19]; the influence of gravitational fluxes, propagating from one universe to the other one through the WH neck, and influencing the accelerations of stellar objects [20]; the presence of strong tidal effects close to the WH neck, strongly depending on their geometries [21]; the absence of chaotic motions near strong gravitational field regions due to the lack of an horizon [22,23]. Recently, we have proposed another strategy for the detection of WHs' existence through the general relativistic Poynting-Robertson (PR) effect.…”

Section: Introductionmentioning

confidence: 99%

Testing wormhole solutions in extended gravity through the Poynting-Robertson effect

De Falco,

Battista,

Capozziello

et al. 2021

Preprint

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We develop a model-independent procedure to single out static and spherically symmetric wormhole solutions based on the general relativistic Poynting-Robertson effect and the extension of the ray-tracing formalism in generic static and spherically symmetric wormhole metrics. Simulating the flux emitted by the Poynting-Robertson critical hypersurface (i.e., a stable structure where gravitational and radiation forces attain equilibrium) or also from another X-ray source in these general geometrical environments toward a distant observer, we are able to reconstruct, only locally to the emission region, the wormhole solutions which are in agreement with the high-energy astrophysical observational data. This machinery works only if wormhole evidences have been detected. Indeed, in our previous paper we showed how the Poynting-Robertson critical hypersurfaces can be located in regions of strong gravitational field and become valuable astrophysical probe to observationally search for wormholes' existence. As examples, we apply our method to selected wormhole solutions in different extended theories of gravity by producing lightcurves, spectra, and images of an accretion disk. In addition, the present approach may constitute a procedure to also test the theories of gravity. Finally, we discuss the obtained results and draw the conclusions.

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Tidal disruption near black holes and their mimickers

Cited by 4 publications

References 22 publications

Novel triple barrier potential for axial gravitational perturbations of a family of Lorentzian wormholes

Novel triple barrier potential for axial gravitational perturbations of a family of Lorentzian wormholes

Epicyclic frequencies in static and spherically symmetric wormhole geometries

Testing wormhole solutions in extended gravity through the Poynting-Robertson effect

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