Chromaticity Effects in Microlensing by Wormholes

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

doi:10.1142/s021773230100398x

Cited by 42 publications

(34 citation statements)

References 14 publications

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“…In this regard, this work extends and deepens previous papers in several ways, and gives a complete description from where to analyze, from a computational and quantitative point of view, observational predictions, as the ones presented for chromaticity in Ref. [18].…”

Section: Introductionsupporting

confidence: 66%

Microlensing by natural wormholes: Theory and simulations

2001

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We provide an in depth study of the theoretical peculiarities that arise in effective negative mass lensing, both for the case of a point mass lens and source, and for extended source situations. We describe novel observational signatures arising in the case of a source lensed by a negative mass. We show that a negative mass lens produces total or partial eclipse of the source in the umbra region and also show that the usual Shapiro time delay is replaced with an equivalent time gain. We describe these features both theoretically, as well as through numerical simulations. We provide negative mass microlensing simulations for various intensity profiles and discuss the differences between them. The light curves for microlensing events are presented and contrasted with those due to lensing produced by normal matter. Presence or absence of these features in the observed microlensing events can shed light on the existence of natural wormholes in the Universe.PACS numbers: 95.30. Sf, 98.90.+s, 04.20.Gz

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Section: Introductionsupporting

confidence: 66%

Microlensing by natural wormholes: Theory and simulations

2001

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“…In [9], the coefficients a and b were calculated numerically. Here, by our general method, we have been able to derive the coefficient a for the logarithmic divergence exactly and find a formula for b which is valid up to second order in q, indicating the way to extend it to an arbitrary order.…”

Section: B Reissner-nordstrom Lensingmentioning

confidence: 99%

Gravitational lensing in the strong field limit

2002

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We provide an analytic method to discriminate among different types of black holes on the ground of their strong field gravitational lensing properties. We expand the deflection angle of the photon in the neighbourhood of complete capture, defining a strong field limit, in opposition to the standard weak field limit. This expansion is worked out for a completely generic spherically symmetric spacetime, without any reference to the field equations and just assuming that the light ray follows the geodesics equation. We prove that the deflection angle always diverges logarithmically when the minimum impact parameter is reached. We apply this general formalism to Schwarzschild, Reissner-Nordstrom and Janis-Newman-Winicour black holes. We then compare the coefficients characterizing these metrics and find that different collapsed objects are characterized by different strong field limits. The strong field limit coefficients are directly connected to the observables, such as the position and the magnification of the relativistic images. As a concrete example, we consider the black hole at the centre of our galaxy and estimate the optical resolution needed to investigate its strong field behaviour through its relativistic images.

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“…We would rather expect the existence of compact objects of solar or sub-solar negative mass, as opposed to larger structures whose effects are apparently absent from all deep fields images [9]. Then we will not be able to see the images, but only to observe the microlensing light curves, and/or distinctive chromaticity effects (see [25]). …”

Section: Discussionmentioning

confidence: 95%

Degeneracy in Exotic Gravitational Lensing

Safonova

Torres

2002

Mod. Phys. Lett. A

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We present three different theoretically foreseen, but unusual, astrophysical situations where the gravitational lens equation ends up being the same, thus producing a degeneracy problem. These situations are (a) the case of gravitational lensing by exotic stresses (matter violating the weak energy condition and thus having a negative mass, particular cases of wormholes solutions can be used as an example), (b) scalar field gravitational lensing (i.e. when considering the appearance of a scalar charge in the lensing scenario), and (c) gravitational lensing in closed universes (with antipodes).The reasons that lead to this degeneracy in the lens equations, the possibility of actually encountering it in the real universe, and eventually the ways to break it, are discussed.

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Chromaticity Effects in Microlensing by Wormholes

Cited by 42 publications

References 14 publications

Microlensing by natural wormholes: Theory and simulations

Microlensing by natural wormholes: Theory and simulations

Gravitational lensing in the strong field limit

Degeneracy in Exotic Gravitational Lensing

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