On the Possibility of an Astronomical Detection of Chromaticity Effects in Microlensing by Wormhole-Like Objects

Torres, D. F.; Eiroa, Ernesto F.; Romero, Gustavo E.

doi:10.1142/s0217732301005126

Cited by 6 publications

(3 citation statements)

References 10 publications

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“…The gravitational lensing of a number of wormhole solutions has been studied; see, e.g., Refs. [36][37][38][39][40][41][42][43][44][45][46][47][48][49][50][51]. Observational bounds on the possible abundance of these structures are reported in Refs.…”

Section: Gravitational Lensingmentioning

confidence: 99%

Astrophysical Wormholes

Bambi

Stojković

2021

Universe

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Section: Gravitational Lensingmentioning

confidence: 99%

Astrophysical Wormholes

Bambi

Stojković

2021

Universe

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“…Cramer et al [23] suggested that a wormhole mouth embedded in high mass density may cause gravitational lensing effect and the resulting light enhancement can be observed. Torres et al, examined the scenario of extragalactic microlensing for natural wormholes in [102] and [103].…”

Section: Conversion Of a Wormhole Into Time Machine Was Proposed By Mmentioning

confidence: 99%

Static and Dynamic Traversable Wormholes

Adamiak¹

2008

The Eleventh Marcel Grossmann Meeting

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The aim of this work is to discuss the effects found in static and dynamic wormholes that occur as a solution of Einstein equations in general relativity. The ground is prepared by presentation of "faster than light" effects, historical perspective, wormhole definition and contemporary directions in wormhole research. Then the focus is narrowed to Morris-Thorne framework for static spherically symmetric wormhole. Energy conditions being a fundamental component in wormhole physics are discussed in detail, their definition, most common violations and attempts to exotic matter quantification. Two types of dynamic wormholes, evolving and rotating, together with their variations are considered. Computer algebra and Cartan calculus are used to obtain detailed solutions. i Acknowledgement This thesis is a result of collaboration with my advisor, professor Nigel Bishop. I would like to use this opportunity to thank him for sharing his expertise, insight and many in depth discussions which have greatly enriched my understanding of applied mathematics. My appreciation extends to my family, Anna and Daniel, for their enthusiastic support, endless patience and help with day-today issues during this strenuous time. To my parents for their support of my choices even if they thought them to be too idealistic. Many words of special thanks belong to Elna whose energy, strong commonsense and help with meanders of English language are always highly valued and very much appreciated. To my friends and colleagues I would like to thank them for their tolerance and understanding of the fact that "gravity is what really matters" and accepting that this statement, can actually be elevated to a lifestyle, as in my case. I would also like to give many thanks to Unisa staff for the most fruitful relationship during a number of years and for making this university the most unique of its kind. v Notation We take the spacetime metric to have signature (− + ++) that is consistent with this of Misner, Thorne and Wheeler [79]. We shall use geometric units in which gravitational constant G and the speed of light c are set to one, when we deal with equations of general relativity. Latin indices are used to describe four dimensional expression i.e. a = 0, 1, 2, 3. Spacelike part of the expression is indexed by Greek characters i.e. α = 1, 2, 3. We denote components of Lorentzian metrics by η ab. In general the metric components are symbolized by g ab. vi

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“…Interestingly, the wormhole may not only be limited to the domain of the theorist. Some very interesting studies have been performed regarding possible astrophysical signatures of such objects [15] - [19].…”

Section: Introductionmentioning

confidence: 99%

Higher dimensional wormhole geometries with compact dimensions

DeBenedictis

Das

2003

Nuclear Physics B

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This paper studies wormhole solutions to Einstein gravity with an arbitrary number of time dependent compact dimensions and a matter-vacuum boundary. A new gauge is utilized which is particularly suited for studies of the wormhole throat. The solutions possess arbitrary functions which allow for the description of infinitely many wormhole systems of this type and, at the stellar boundary, the matter field is smoothly joined to vacuum. It turns out that the classical vacuum structure differs considerably from the four dimensional theory and is therefore studied in detail. The presence of the vacuum-matter boundary and extra dimensions places interesting restrictions on the wormhole. For example, in the static case, the radial size of a weak energy condition (WEC) respecting throat is restricted by the extra dimensions. There is a critical dimension, D = 5, where this restriction is eliminated. In the time dependent case, one cannot respect the WEC at the throat as the time dependence actually tends the solution towards WEC violation. This differs considerably from the static case and the four dimensional case.PACS numbers: 04.20. Gz, 04.50.+h, 95.30.Sf

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On the Possibility of an Astronomical Detection of Chromaticity Effects in Microlensing by Wormhole-Like Objects

Cited by 6 publications

References 10 publications

Astrophysical Wormholes

Astrophysical Wormholes

Static and Dynamic Traversable Wormholes

Higher dimensional wormhole geometries with compact dimensions

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