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The ergosphere is a region located outside a rotating black hole. Its name is derived from the Greek word ergon, which means “work”. It received this name because it is theoretically possible to extract energy and mass from the black hole in this region.
The ergosphere is ellipsoidal in shape and is situated so that at the poles of rotating black hole it touches the event horizon and stretches out to a distance that is equal to the radius of the event horizon. Within the ergosphere spacetime is dragged along in the direction of the rotation of the black hole at a speed greater than the speed of light in relation to the rest of the universe
Originally posted by Now_Then
So you would need a black hole within your space craft? Or something that would provide an equivalent gravity well?? How would a person be able to travel within that craft?
Tipler cylinder, also called a Tipler time machine, is a hypothetical object theorized to be a potential mode of time travel—an approach that is conceivably functional within humanity's current understanding of physics, specifically the theory of general relativity, although later results have shown that a Tipler cylinder could only allow time travel if its length were infinite (see the discussion of Hawking's conjecture below).
Frank J. 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.[1]
CTC's 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 posited a conjecture showing 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,[2] he did not prove this. But Hawking argues that because of his conjecture, "it can't be done with positive energy density everywhere! I can prove that to build a finite time machine, you need negative energy."[3] This argument comes from Hawking's 1992 paper on the chronology protection conjecture, where 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."[4]
Originally posted by devilruski
Ive read Dr. Michio Kaku's Hyperspace, and I thought time travel was already theoretically possible under the certain black hole requirements, or is this another twist on the theory that I don't understand yet?
Originally posted by sunny_2008ny
S & F
I am not an expert in astrophysics, if I assume correctly the gravity from the black hole is causing this ? How was this first detected and how we came to the conslusion it is faster than the speed of light, is what I am interested in.
Originally posted by jimmyx
the problem lies in the assertion that something traveling faster then light can be measured and thus proven. because of the limitations of the human mind, speculative assumptions is the closest we can get.
Originally posted by Amaterasu
My friend, the inventor, has invented a craft that relies on a singularity. It allows movement that would appear as FTL to those outside the craft.
Granted it is still only on paper, as he has no money to create a prototype, but he seems to have grasped something.
I did some illustrations of his idea and they are available here: www.frontsoft.com...
Originally posted by constantwonder
this idea originated by frank tipler is theoreticaly possible but in practice its to dangerous and would be one hell of a feat of engineering and mind power just to get a craft that could withstand the tidal forces around the black hole. . . . maybe or something
Originally posted by damwel
It seems to me the singularity would have to travel along with you to maintain the bubble and so therefore would have to be contained within the vehicle.
Originally posted by damwel
The question that I wonder about is how you prevent the singularity that creates the static warp bubble from crushing everything within the event horizon.
Originally posted by DaMod
I actually had a hypothesis for a while that gravity was a form of magnetism. We've seen in some superconductors the same lensing effect you see with gravity, which gives us a good hint that gravity is something other than what we think it is and perhaps is a connected force.
Originally posted by ahnggk
en.wikipedia.org...
The ergosphere is a region located outside a rotating black hole. Its name is derived from the Greek word ergon, which means “work”. It received this name because it is theoretically possible to extract energy and mass from the black hole in this region.
The ergosphere is ellipsoidal in shape and is situated so that at the poles of rotating black hole it touches the event horizon and stretches out to a distance that is equal to the radius of the event horizon. Within the ergosphere spacetime is dragged along in the direction of the rotation of the black hole at a speed greater than the speed of light in relation to the rest of the universe
This simply means if you are stationary inside an ergosphere, you should be moving faster than light if observed far beyond this ergosphere while still obeying General Relativity... If this thing is for real, you can travel at speeds blindingly many times faster than light if you could only duplicate this field around your spacecraft..
I was too excited finding this out today on my continuing research on astrophysics...
Originally posted by LucidDreamer85
Is that why we can only see the ships flying away really fast for a split second, because they are traveling faster than the light they produce that we would see so it looks like it dissapears but is just moving faster than the light it creates?