Strong field lensing by Damour-Solodukhin wormhole

Nandi, K. K.; Izmailov, R. N.; Zhdanov, E. R.; Bhattacharya, Amrita

doi:10.1088/1475-7516/2018/07/027

Cited by 35 publications

(31 citation statements)

References 19 publications

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“…This is beyond what VLBI on Earth can achieve. In a similar spirit, tests based on strong-lensing events [466,467] (in fact, a variant of shadows) or quantum versions of it [468] have been proposed. Adding to the list of possible discriminators, Ref.…”

Section: Bounds With Shadows: Sgr a * And M87mentioning

confidence: 99%

Testing the nature of dark compact objects: a status report

2019

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Very compact objects probe extreme gravitational fields and may be the key to understand outstanding puzzles in fundamental physics. These include the nature of dark matter, the fate of spacetime singularities, or the loss of unitarity in Hawking evaporation. The standard astrophysical description of collapsing objects tells us that massive, dark and compact objects are black holes. Any observation suggesting otherwise would be an indication of beyond-the-standard-model physics. Null results strengthen and quantify the Kerr black hole paradigm. The advent of gravitationalwave astronomy and precise measurements with very long baseline interferometry allow one to finally probe into such foundational issues. We overview the physics of exotic dark compact objects and their observational status, including the observational evidence for black holes with current and future experiments.

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Section: Bounds With Shadows: Sgr a * And M87mentioning

confidence: 99%

Testing the nature of dark compact objects: a status report

2019

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“…Our aim was to examine how far the attractive positive mass mouth of RDSWH mimicks profiles of the Kerr BH for small values of λ inspired by strong field lensing, which in general is an excellent diagnostic for comparison between two categories of objects (BH and WH) with differing topology, see. e.g., [15,16]. We chose for illustration a rotating stellar sized wormhole as the accreting object and obtained certain non-trivial generic characteristics of the disk.…”

Section: Discussionmentioning

confidence: 99%

“…These developments prompt a natural inquiry as to whether static DSWH can exhibit mimicking of SBH in other phenomenon as well. A recent work [15] shows that it indeed can, e.g., it can very accurately mimic SBH strong field lensing properties for λ ≤ 10 −3 . However, this is only an upper bound, which obviously does not rule out values of λ arbitrarily close to zero.…”

Section: Introductionmentioning

confidence: 93%

“…The generic Eqs. (7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19) are valid for any rotating spacetime that will be explicitly calculated in what follows.…”

Section: Generic Rotating Spacetimementioning

confidence: 99%

“…The critical values of radius r crit and of frequency ν crit where the corresponding maxima occur is shown in the columns 5 should ensure that r ms > r + , which is a necessary condition so that the accreting particles do not reach the throat and disappear into the other universe even for extreme limit a = 1. A special feature of the RDSWH is that it does satisfy this condition for λ < 10 −3 , the strong field lensing constraint for mimicking BHs [15] (see Fig. 1).…”

Section: Accretion Disk Properties Of Rdswhmentioning

confidence: 99%

See 2 more Smart Citations

Accretion disk around the rotating Damour–Solodukhin wormhole

Karimov¹,

Izmailov²,

Nandi³

2019

Eur. Phys. J. C

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A new rotating generalization of the Damour-Solodukhin wormhole (RDSWH), called Kerr-like wormhole, has recently been proposed and investigated by Bueno et al. for echoes in the gravitational wave signal. We show a novel feature of the RDSWH, viz., that the kinematic properties such as the ISCO or marginally stable radius r ms , efficiency and the disk potential V eff are independent of λ (which means they are identical to their KBH counterparts for any given spin). Differences however appear in the emissivity properties for higher values 0.1 < λ ≤ 1 (say) and for the extreme spin a = 0.998. The kinematic and emissivity are generic properties as variations of the wormhole mass and the rate of accretion within the model preserve these properties. Specifically, the behavior of the luminosity peak is quite opposite to each other for the two objects, which could be useful from the viewpoint of observations. Apart from this, an estimate of the difference Δ λ in the maxima of flux of radiation F(r) shows non-zero values but is too tiny to be observable at present for λ < 10 −3 permitted by the strong lensing bound. The broad conclusion is that RDSWH are experimentally indistinguishable from KBH by accretion characteristics.

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Gravitational Lensing by Traversable Wormholes Supported by Three‐Form Fields

2023

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In this paper, the deflection angle of light by traversable wormholes, which are supported by the three‐form fields, are studied. The specific forms of the redshift and shape functions that produce results compatible with the energy conditions at throat of the wormholes are used. Having used the well‐defined parameter sets of the three‐form wormholes, the photon geodesic motion is investigated under the effective potential of the wormhole background. As a result, it is discovered that the radius of the photon sphere can be used to analyze the geometrical structures of a physical wormhole. The analytical form of the effective potential is used to figure out a deflection angle of light caused by wormholes with the three‐from fields. In this work, the relativistic images generated from the wormholes are also constructed.

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Strong field lensing by Damour-Solodukhin wormhole

Cited by 35 publications

References 19 publications

Testing the nature of dark compact objects: a status report

Testing the nature of dark compact objects: a status report

Accretion disk around the rotating Damour–Solodukhin wormhole

Gravitational Lensing by Traversable Wormholes Supported by Three‐Form Fields

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