Caustics of 1/rn binary gravitational lenses: from galactic haloes to exotic matter

  title={Caustics of 1/rn binary gravitational lenses: from galactic haloes to exotic matter},
  author={Valerio Bozza and Chiara Melchiorre},
  journal={Journal of Cosmology and Astroparticle Physics},
  pages={040 - 040}
We investigate the caustic topologies for binary gravitational lenses made up of two objects whose gravitational potential declines as 1/rn. With n<1 this corresponds to power-law dust distributions like the singular isothermal sphere. The n>1 regime can be obtained with some violations of the energy conditions, one famous example being the Ellis wormhole. Gravitational lensing provides a natural arena to distinguish and identify such exotic objects in our Universe. We find that there are still… 

Caustics in Gravitational Lensing by Mixed Binary Systems

We investigated binary lenses with 1/rn potentials in the asymmetric case with two lenses with different indexes n and m. These kinds of potentials have been widely used in several contexts, ranging

Dual-component plasma lens models

  • A. RogersX. Er
  • Physics
    Monthly Notices of the Royal Astronomical Society
  • 2019
In contrast to the converging, achromatic behaviour of axisymmetric gravitational lenses, diverging frequency-dependent lensing occurs from refraction due to a distribution of over-dense axisymmetric

Gravitational lensing by exotic objects

This paper reviews a phenomenological approach to the gravitational lensing by exotic objects such as the Ellis wormhole lens, where exotic lens objects may follow a non-standard form of the equation

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We investigate gravitational lensing by a primary photon sphere which is formed by unstable circular light orbits, and by a secondary photon sphere on a wormhole throat in a black-bounce spacetime

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A Simpson-Visser spacetime has two non-negative parameters $a$ and $m$ and its metric is correspond with (i) a Schwarzschild metric for $a=0$ and $m\ensuremath{\ne}0$, (ii) a regular black hole



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Wide-field optical imaging surveys will contain tens of thou sands of new strong gravitational lenses. Some of these will have new and unusual image configurations, and so will enable new

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Gravitational lens models with negative convergence (surface mass density projected onto the lens plane) inspired by modified gravity theories, exotic matter and energy have been recently discussed

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The metric outside an isolated object made up of ordinary matter is bound to be the classical Schwarzschild vacuum solution of General Relativity. Nevertheless, some solutions are known (e.g.

Gravitational lensing in Tangherlini spacetime in the weak gravitational field and the strong gravitational field

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Cosmology with cosmic shear observations: a review

  • M. Kilbinger
  • Physics
    Reports on progress in physics. Physical Society
  • 2015
An outlook on the various future surveys and missions, for which cosmic shear is one of the main science drivers, and discuss promising new weak cosmological lensing techniques for future observations are discussed.