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- Tipler_cylinder abstract "A Tipler cylinder, also called a Tipler time machine, is a hypothetical object theorized to be a potential mode of time travel—although results have shown that a Tipler cylinder could only allow time travel if its length were infinite or with the existence of negative energy (see the discussion of Hawking's proof below).The Tipler cylinder was discovered as a solution to the equations of general relativity by Willem Jacob van Stockum in 1936 and Kornel Lanczos in 1924, but not recognized as allowing closed timelike curves until an analysis by Frank Tipler in 1974. Tipler showed in his 1974 paper, "Rotating Cylinders and the Possibility of Global Causality Violation" that in a spacetime containing a massive, infinitely long cylinder which was spinning along its longitudinal axis, the cylinder should create a frame-dragging effect. This frame-dragging effect warps spacetime in such a way that the light cones of objects in the cylinder's proximity become tilted, so that part of the light cone then points backwards along the time axis on a space time diagram. Therefore a spacecraft accelerating sufficiently in the appropriate direction can travel backwards through time along a closed timelike curve or CTC.CTCs are associated, in Lorentzian manifolds which are interpreted physically as spacetimes, with the possibility of causal anomalies such as going back in time and potentially shooting your own grandfather, although paradoxes might be avoided using some constraint such as the Novikov self-consistency principle. They have an unnerving habit of appearing in some of the most important exact solutions in general relativity, including the Kerr vacuum (which models a rotating black hole) and the van Stockum dust (which models a cylindrically symmetrical configuration of rotating pressureless fluid or dust).An objection to the practicality of building a Tipler cylinder was discovered by Stephen Hawking, who provided a proof that according to general relativity it is impossible to build a time machine in any finite region that satisfies the weak energy condition, meaning that the region contains no exotic matter with negative energy. The Tipler cylinder, on the other hand, does not involve any negative energy. Tipler's original solution involved a cylinder of infinite length, which is easier to analyze mathematically, and although Tipler suggested that a finite cylinder might produce closed timelike curves if the rotation rate were fast enough, he did not prove this. But Hawking comments "it can't be done with positive energy density everywhere! I can prove that to build a finite time machine, you need negative energy." Hawking's proof appears in his 1992 paper on the chronology protection conjecture (though the proof is distinct from the conjecture itself, since the proof shows that classical general relativity predicts a finite region containing closed timelike curves can only be created if there is a violation of the weak energy condition in that region, whereas the conjecture predicts that closed timelike curves will prove to be impossible in a future theory of quantum gravity which replaces general relativity). In the paper, he examines "the case that the causality violations appear in a finite region of spacetime without curvature singularities" and proves that "[t]here will be a Cauchy horizon that is compactly generated and that in general contains one or more closed null geodesics which will be incomplete. One can define geometrical quantities that measure the Lorentz boost and area increase on going round these closed null geodesics. If the causality violation developed from a noncompact initial surface, the averaged weak energy condition must be violated on the Cauchy horizon."".
- Tipler_cylinder wikiPageExternalLink 1976PhDT........61T.
- Tipler_cylinder wikiPageID "661465".
- Tipler_cylinder wikiPageLength "10041".
- Tipler_cylinder wikiPageOutDegree "47".
- Tipler_cylinder wikiPageRevisionID "683760038".
- Tipler_cylinder wikiPageWikiLink Category:Megastructures.
- Tipler_cylinder wikiPageWikiLink Category:Physics_in_fiction.
- Tipler_cylinder wikiPageWikiLink Category:Time_travel_devices.
- Tipler_cylinder wikiPageWikiLink Cauchy_horizon.
- Tipler_cylinder wikiPageWikiLink Chronology_protection_conjecture.
- Tipler_cylinder wikiPageWikiLink Closed_timelike_curve.
- Tipler_cylinder wikiPageWikiLink Closed_timelike_curves.
- Tipler_cylinder wikiPageWikiLink Coordinate_axis.
- Tipler_cylinder wikiPageWikiLink Coordinate_system.
- Tipler_cylinder wikiPageWikiLink Cornelius_Lanczos.
- Tipler_cylinder wikiPageWikiLink Cylinder_(geometry).
- Tipler_cylinder wikiPageWikiLink Dust_solution.
- Tipler_cylinder wikiPageWikiLink Energy_condition.
- Tipler_cylinder wikiPageWikiLink Exotic_matter.
- Tipler_cylinder wikiPageWikiLink Frame-dragging.
- Tipler_cylinder wikiPageWikiLink Frank_J._Tipler.
- Tipler_cylinder wikiPageWikiLink Frank_Tipler.
- Tipler_cylinder wikiPageWikiLink Galaxy_Quest.
- Tipler_cylinder wikiPageWikiLink Grandfather_paradox.
- Tipler_cylinder wikiPageWikiLink Hypothesis.
- Tipler_cylinder wikiPageWikiLink Hypothetical.
- Tipler_cylinder wikiPageWikiLink John_DeChancie.
- Tipler_cylinder wikiPageWikiLink Kerr_metric.
- Tipler_cylinder wikiPageWikiLink Key_lime.
- Tipler_cylinder wikiPageWikiLink Kornel_Lanczos.
- Tipler_cylinder wikiPageWikiLink Kris_Straub.
- Tipler_cylinder wikiPageWikiLink Larry_Niven.
- Tipler_cylinder wikiPageWikiLink Light_cone.
- Tipler_cylinder wikiPageWikiLink Naked_black_hole.
- Tipler_cylinder wikiPageWikiLink Naked_singularity.
- Tipler_cylinder wikiPageWikiLink Novikov_self-consistency_principle.
- Tipler_cylinder wikiPageWikiLink Poul_Anderson.
- Tipler_cylinder wikiPageWikiLink Pseudo-Riemannian_manifold.
- Tipler_cylinder wikiPageWikiLink Quantum_gravity.
- Tipler_cylinder wikiPageWikiLink Robert_Wald.
- Tipler_cylinder wikiPageWikiLink Roger_Penrose.
- Tipler_cylinder wikiPageWikiLink Roy_Kerr.
- Tipler_cylinder wikiPageWikiLink SCP_Foundation.
- Tipler_cylinder wikiPageWikiLink Short_story.
- Tipler_cylinder wikiPageWikiLink Spacecraft.
- Tipler_cylinder wikiPageWikiLink Spacetime.
- Tipler_cylinder wikiPageWikiLink Star_Trek_Online.
- Tipler_cylinder wikiPageWikiLink Steins;Gate.
- Tipler_cylinder wikiPageWikiLink Stephen_Hawking.
- Tipler_cylinder wikiPageWikiLink Theory.
- Tipler_cylinder wikiPageWikiLink Time_travel.
- Tipler_cylinder wikiPageWikiLink University_of_Chicago.
- Tipler_cylinder wikiPageWikiLink Van_Stockum_dust.
- Tipler_cylinder wikiPageWikiLink Vernor_Vinge.
- Tipler_cylinder wikiPageWikiLink Weak_energy_condition.
- Tipler_cylinder wikiPageWikiLink Willem_Jacob_van_Stockum.
- Tipler_cylinder wikiPageWikiLink William_H._Keith,_Jr..
- Tipler_cylinder wikiPageWikiLinkText "Tipler Cylinder".
- Tipler_cylinder wikiPageWikiLinkText "Tipler cylinder".
- Tipler_cylinder hasPhotoCollection Tipler_cylinder.
- Tipler_cylinder wikiPageUsesTemplate Template:Refbegin.
- Tipler_cylinder wikiPageUsesTemplate Template:Refend.
- Tipler_cylinder wikiPageUsesTemplate Template:Reflist.
- Tipler_cylinder wikiPageUsesTemplate Template:Time_travel.
- Tipler_cylinder subject Category:Megastructures.
- Tipler_cylinder subject Category:Physics_in_fiction.
- Tipler_cylinder subject Category:Time_travel_devices.
- Tipler_cylinder hypernym Object.
- Tipler_cylinder type Planet.
- Tipler_cylinder type Megastructure.
- Tipler_cylinder type Object.
- Tipler_cylinder type Physic.
- Tipler_cylinder comment "A Tipler cylinder, also called a Tipler time machine, is a hypothetical object theorized to be a potential mode of time travel—although results have shown that a Tipler cylinder could only allow time travel if its length were infinite or with the existence of negative energy (see the discussion of Hawking's proof below).The Tipler cylinder was discovered as a solution to the equations of general relativity by Willem Jacob van Stockum in 1936 and Kornel Lanczos in 1924, but not recognized as allowing closed timelike curves until an analysis by Frank Tipler in 1974. ".
- Tipler_cylinder label "Tipler cylinder".
- Tipler_cylinder sameAs Cylinder_Tiplera.
- Tipler_cylinder sameAs m.030p54.
- Tipler_cylinder sameAs Cilindru_Tipler.
- Tipler_cylinder sameAs Цилиндр_Типлера.
- Tipler_cylinder sameAs Q4505651.
- Tipler_cylinder sameAs Q4505651.
- Tipler_cylinder wasDerivedFrom Tipler_cylinder?oldid=683760038.
- Tipler_cylinder isPrimaryTopicOf Tipler_cylinder.