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One of the most cherished science fiction scenarios is using a black hole as a portal to another dimension or time or universe. That fantasy may be closer to reality than previously imagined.
Researchers previously thought that any spacecraft attempting to use a black hole as a portal of this type would have to reckon with nature at its worst. The hot and dense singularity would cause the spacecraft to endure a sequence of increasingly uncomfortable tidal stretching and squeezing before being completely vaporized.
My team at the University of Massachusetts Dartmouth and a colleague at Georgia Gwinnett College have shown that all black holes are not created equal. If the black hole like Sagittarius A*, located at the center of our own galaxy, is large and rotating, then the outlook for a spacecraft changes dramatically. That's because the singularity that a spacecraft would have to contend with is very gentle and could allow for a very peaceful passage.
Rotating black holes may serve as gentle portals for hyperspace travel
ROTATING BLACK HOLE = DONUT-SHAPED SINGULARITY
Fortunately, most black holes are not static. They spin. Spinning black holes are often referred to as Kerr black holes. A Kerr black hole has two interesting properties. One, they have two event horizons and two, the singularity is not a point, it looks more like a donut. These odd properties also have a pronounced affect on the black hole's gravity.
There are vectors where you can approach the singularity without being crushed by gravity.
DONUT-SHAPED SINGULARITY = PASSAGE INTO ALTERNATE WORLDLINE
Another other more interesting result of passing through a donut singularity is that you travel through time by passing into another universe or worldline. Please see Penrose diagrams for Kerr Black holes or you can examine the calculations of Frank Tipler.
So now the problem becomes where do we find a donut-shaped singularity?
A team of researchers from Georgia Gwinnett College, UMass Dartmouth, and the University of Maryland have designed new supercomputer models to study the exotic physics of quickly-rotating black holes, a.k.a. Kerr black holes, and what might be found in the mysterious realm beyond the event horizon. What they found was the dynamics of their rapid rotation create a scenario in which a hypothetical spacecraft and crew might avoid gravitational disintegration during approach.
"We developed a first-of-its-kind computer simulation of how physical fields evolve on the approach to the center of a rotating black hole," said Dr. Lior Burko, associate professor of physics at Georgia Gwinnett College and lead researcher on the study. "It has often been assumed that objects approaching a black hole are crushed by the increasing gravity. However, we found that while gravitational forces increase and become infinite, they do so fast enough that their interaction allows physical objects to stay intact as they move toward the center of the black hole."
If you're going to fall into a black hole, make sure it's rotating
Although the Kerr solution appears to be singular at the roots of Δ = 0, these are actually coordinate singularities, and, with an appropriate choice of new coordinates, the Kerr solution can be smoothly extended through the values of r corresponding to these roots. The larger of these roots determines the location of the event horizon, and the smaller determines the location of a Cauchy horizon. A (future-directed, time-like) curve can start in the exterior and pass through the event horizon. Once having passed through the event horizon, the r coordinate now behaves like a time coordinate, so it must decrease until the curve passes through the Cauchy horizon.[28]
The region beyond the Cauchy horizon has several surprising features. The r coordinate again behaves like a spatial coordinate and can vary freely. The interior region has a reflection symmetry, so that a (future-directed time-like) curve may continue along a symmetric path, which continues through a second Cauchy horizon, through a second event horizon, and out into a new exterior region which is isometric to the original exterior region of the Kerr solution. The curve could then escape to infinity in the new region or enter the future event horizon of the new exterior region and repeat the process. This second exterior is sometimes thought of as another universe. On the other hand, in the Kerr solution, the singularity is a ring, and the curve may pass through the center of this ring. The region beyond permits closed time-like curves. Since the trajectory of observers and particles in general relativity are described by time-like curves, it is possible for observers in this region to return to their past.[20][21] This interior solution is not likely to be physical and considered as a purely mathematical artefact.[29]
Kerr black holes as wormholes
originally posted by: ChaoticOrder
There are vectors where you can approach the singularity without being crushed by gravity.
originally posted by: Deplorable
I'm willing to bet you $20 that this is not proven "by doing" in the next ten years. It's speculation.
originally posted by: CthulhuMythos
Just a thought, if Titor was an adult from 2036, doesn't that mean he must be walking the earth as a child in 2020? So potentially he could be traced.
originally posted by: Ksihkehe
a reply to: ChaoticOrder
Donuts, or tori, have some pretty neat qualities that I honestly don't fully understand. I don't think anyone does really understand them as a 4th dimension object...
originally posted by: ChaoticOrder
a reply to: schuyler
I doubt John Titor is even his real name, the only thing we really know is he'd be about 22 right now. I doubt he would know anything important anyway, he's probably on a very different path than the time traveling Titor, assuming he even exists at all.