Astrophysical Signatures of Thin Accretion Disks in Wormhole Spacetimes

Harkó, Tiberiu; Kovács, Zoltán

doi:10.1007/978-3-319-55182-1_4

Cited by 3 publications

(2 citation statements)

References 37 publications

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“…Strong gravitational lensing by wormholes were recently studied in [45] and [46]. Accretion disk properties of wormholes have been studied in [47,48], and the more recent review of [49].…”

Section: Introductionmentioning

confidence: 99%

Tidal disruption near black holes and their mimickers

Banerjee

Paul

Shaikh

et al. 2021

J. Cosmol. Astropart. Phys.

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Black holes and wormholes are solutions of Einstein's field equations, both of which, from afar, can look like a central mass. We show here that although at large distances both behave like Newtonian objects, close to the event horizon or to the throat, black holes and wormholes have different tidal effects on stars, due to their respective geometries. We quantify this difference by a numerical procedure in the Schwarzschild black hole and the exponential wormhole backgrounds, and compare the peak fallback rates of tidal debris in these geometries. The tidal disruption rates in these backgrounds are also computed. It is shown that these quantities are a few times higher for wormholes, compared to the black hole cases.

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“…Strong gravitational lensing by wormholes were recently studied in [45] and [46]. Accretion disk properties of wormholes have been studied in [47,48], and the more recent review of [49].…”

Section: Introductionmentioning

confidence: 99%

Tidal disruption near black holes and their mimickers

Banerjee

Paul

Shaikh

et al. 2021

J. Cosmol. Astropart. Phys.

View full text Add to dashboard Cite

show abstract

“…Strong gravitational lensing by wormholes were recently studied by Shaikh et al (2019a) and Shaikh et al (2019b). Accretion disk properties of wormholes have been studied in Harko, Kovacs and Lobo (2008), Harko, Kovacs and Lobo (2009), and the more recent review of Harko, Kovacs and Lobo (2017).…”

Section: Introductionmentioning

confidence: 99%

Tidal disruption near black holes and their mimickers

Banerjee,

Paul,

Shaikh

et al. 2019

Preprint

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Black holes and wormholes are solutions of Einstein's field equations, both of which, from afar, look like a central mass. We show here that although at large distances both behave like Newtonian objects, close to the event horizon or to the throat, black holes and wormholes have different tidal effects on stars, due to their respective geometries. We quantify this difference by a numerical procedure in the Schwarzschild black hole and the exponential wormhole backgrounds, and compare the peak fallback rates of tidal debris in these geometries. The tidal disruption rates in these backgrounds are also computed. It is shown that these quantities are a few times higher for wormholes, compared to the black hole cases.

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Dynamic wormhole geometries in hybrid metric-Palatini gravity

Zangeneh

2021

Eur. Phys. J. C

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In this work, we analyse the evolution of time-dependent traversable wormhole geometries in a Friedmann–Lemaître–Robertson–Walker background in the context of the scalar–tensor representation of hybrid metric-Palatini gravity. We deduce the energy–momentum profile of the matter threading the wormhole spacetime in terms of the background quantities, the scalar field, the scale factor and the shape function, and find specific wormhole solutions by considering a barotropic equation of state for the background matter. We find that particular cases satisfy the null and weak energy conditions for all times. In addition to the barotropic equation of state, we also explore a specific evolving wormhole spacetime, by imposing a traceless energy–momentum tensor for the matter threading the wormhole and find that this geometry also satisfies the null and weak energy conditions at all times.

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Astrophysical Signatures of Thin Accretion Disks in Wormhole Spacetimes

Cited by 3 publications

References 37 publications

Tidal disruption near black holes and their mimickers

Tidal disruption near black holes and their mimickers

Tidal disruption near black holes and their mimickers

Dynamic wormhole geometries in hybrid metric-Palatini gravity

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