Gravitational lensing as a mechanism for effective cloaking

Tippett, Benjamin K.

doi:10.1103/physrevd.84.104034

Cited by 8 publications

(12 citation statements)

References 12 publications

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“…The short answer is that it is very easy to make a spacetime which is curved so that a very large volume sits inside a very small box. You can even use curved spacetime geometries to make very large objects appear very very small [11]! Long story short: Bigger on the inside is too easy to bother.…”

Section: Tipler Cylindermentioning

confidence: 99%

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The Blue Box White Paper

Tippett,

Tsang

2013

Preprint

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This white paper is an explanation of Ben and Dave's TARDIS time machine, written for laypeople who are interested in time travel, but have no technical knowledge of Einstein's Theory of General Relativity.The first part of this paper is an introduction to the pertinent ideas from Einstein's theory of curved spacetime, followed by a review of other popular time machine spacetimes. We begin with an introduction to curvature and lightcones. We then explain the Alcubierre Warp Drive, the Morris-Thorne wormhole, and the Tipler cylinder.We then describe the Traversable Achronal Retrograde Domain in Spacetime (TARDIS), and explain some of its general properties. Our TARDIS is a bubble of spacetime curvature which travels along a closed loop in space and time. A person travelling within the bubble will feel a constant acceleration. A person outside of the TARDIS will see two bubbles: one which is evolving forwards in time, and one which is evolving backwards in time. We then discuss the physical limitations which may prevent us from ever constructing a TARDIS. Finally, we discuss the method through which a TARDIS can be used to travel between arbitrary points in space and time, and the possible dangers involved with exiting a TARDIS from the wrong side.

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Section: Tipler Cylindermentioning

confidence: 99%

“…A person travelling within the TARDIS would describe it as a room which is constantly accelerating forwards. Furthermore, any events which occur inside of the TARDIS bubble must satisfy Novikov's self consistency condition 11 .…”

Section: Backwards In Time Forwardsmentioning

confidence: 99%

The Blue Box White Paper

Tippett,

Tsang

2013

Preprint

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“…Therefore, it became possible to create metamaterials that simulate general relativity models and cosmological effects [13]. In particular, by choosing the correct transformation, or by direct use of the general metric, it is possible to simulate light propagating around a Schwarzschild black hole [14,15,16,17], to observe Hawking radiation [18], to simulate a spinning cosmic string [19], optical wormhole [20], gravitational lensing [21,22,23], de Sitter spacetime [24], Big Crunch [25], time travel [26], all of these applications in the context of optics.…”

Section: Introductionmentioning

confidence: 99%

Ergoregion in Metamaterials Mimicking a Kerr Spacetime

Pires¹,

Rocha²,

Brandão³

2017

Frontiers in Optics 2017

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We propose a simple singularity-free coordinate transformation that could be implemented in Maxwell's equations in order to simulate one aspect of a Kerr black hole. Kerr black holes are known to force light to rotate in a predetermined direction inside the ergoregion. By making use of cosmological analogies and the theoretical framework of transformation optics, we have designed a metamaterial that can make light behave as if it is propagating around a rotating cosmological massive body. We present numerical simulations involving incident Gaussian beams interacting with the materials to verify our predictions. The ergoregion is defined through the dispersion curve of the off-axis permittivities components.

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“…gravitational cloaking can be achieved as a result of the gravitational curvature of physical space-time [7]. If possible, such gravitational cloaking would potentially shed a new light on the issue of dark matter in the universe.…”

mentioning

confidence: 99%

“…If possible, such gravitational cloaking would potentially shed a new light on the issue of dark matter in the universe. Unfortunately, it appears that full three-dimensional gravitational cloaking requires exotic matter and energy sources [7], which makes it physically unrealizable.…”

mentioning

confidence: 99%

Galactic optical cloaking of visible baryonic matter

Smolyaninov

2018

Phys. Rev. D

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Three-dimensional gravitational cloaking is known to require exotic matter and energy sources, which makes it arguably physically unrealizable. On the other hand, typical astronomical observations are performed using one-dimensional paraxial line of sight geometries. We demonstrate that unidirectional line of sight gravitational cloaking does not require exotic matter, and it may occur in multiple natural astronomical scenarios which involve gravitational lensing. In particular, recently discovered double gravitational lens SDSSJ0946+1006 together with the Milky Way appear to form a natural paraxial cloak. A natural question to ask, then, is how much matter in the universe may be hidden from view by such natural gravitational cloaks. It is estimated that the total volume hidden from an observer by gravitational cloaking may reach about 1% of the total volume of the visible universe.Recent developments in metamaterials and transformation optics, which partially rely on general relativity [1], have sparked considerable interest in invisibility cloaking.Several theoretical cloaking schemes had been proposed [2,3], which were quickly followed by experimental demonstrations in various portions of electromagnetic spectrum [4][5][6]. This body of work, which was done using various engineered effective metrics in "virtual" electromagnetic space-time, has inspired an effort to determine if

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Gravitational lensing as a mechanism for effective cloaking

Cited by 8 publications

References 12 publications

The Blue Box White Paper

The Blue Box White Paper

Ergoregion in Metamaterials Mimicking a Kerr Spacetime

Galactic optical cloaking of visible baryonic matter

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