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Black Holes Could Be 'Back Doors' to Another Universe, Say Physicists

An object (physical), such as a spacecraft or a person, could theoretically travel through a wormhole in the alternative universe on the other side, physicists have proposed.

In what looks like the reasonable center of a black hole, and possibly even enter
extension of the strategy of Interstellar, where astronauts try to search another universe after the disastrous effects of climate change finish Earth, physicists have showed what would happen to a wooden chair, a physicist, and a spaceship, if each one reached inside the spherical wormhole of a black hole.

Diego Rubiera-Garcia from the University of Lisbon in Portugal said one of the team members, "What we did was to review a fundamental problem on the relation between the gravity and the fundamental structure of space-time. In useful terms, we dropped one theory that holds in general relativity, but there is no rational reason for it to hold in extensions of this theory."

So let’s go back a bit, and go through some of the fundamentals. According to Albert Einstein’s theory of general relativity, at the center of a black hole lives a singularity - the region at which the forces of gravity are at their maximum intense, and time and space successfully end.

If an object enters the event horizon, it would be wrinkled in one direction, and pushed in another, thanks to the dangerous tidal forces of gravity at show inside a black hole. If the object stays unbroken long enough to travel pass the center of a black hole, it will be extremely long and thin: fundamentally, it’s been spaghettified away from recognition.

Physicists and cosmologists have been studying the theory of a singularity in the center of a black hole for many years, because until we can really prove it exists, there could be so many numbers of possibilities that still hold - in theory.

Previously this year, physicists from the University of Cambridge in the UK said that there’s no reason why a singularity automatically has to be on the inside of a black Hole. They put forward that in a universe of five or more dimensions, which is also not out of the question for us, an 'uncovered' singularly could be real which is not bound by an event horizon.

Of course, this would mean big, enormous things for our current knowledge of how the laws of physics rule our Universe, because it mostly requires Einstein’s theory of general relativity to be wrong.

"If naked singularities occur, general relativity completely breaks down," said one of the team members, Saran Tunyasuvunakool, "And if general relativity breaks down, it would toss everything upside down, because it would no longer have any predictive control - it could no longer be considered as a principle theory to describe the Universe."

Albert being wrong is also the question, either. Stephen Hawking has been clashing for yearswith the manner general relativity seem to clash with quantum mechanics in black holes – a difficult problem known as the information paradox.

So supposing that the conditions of general relativity are not set in stone, the new study from Rubiera-Garcia’s team claim that if you eliminate singularity from a black hole, what you get in the center in its place is a finite-sized wormhole.

Then, they study what could happen if different objects - a chair, a scientist, and a spaceship - made it successfully beyond the event horizon and into the wormhole. These items are referred to as 'observers'.

They showed these observers as a combination of points associated by physical or chemical interactions that hold everything organized as the object voyages along a geodesic route. A geodesic line or a geodesic route is simply the path in space-time that a free-falling object follows.

"Each particle of the observer follows a geodesic route limited by the gravitational field," says Rubiera-Garcia. "Each geodesic senses a faintly different gravitational force, but the contacts among the components of the body could however sustain the body."

Publishing in the journal Classical and Quantum Gravity (QG), the scientists prove this by presenting how the time finished by a light ray in a round journey between two fragments of the body is always finite.

This means no matter how strong those finite forces are could pay off for the impact of the gravitational field nearby and inside the wormhole on a physical body drifting through it.

"Thus, different fragments of the body will still start physical or chemical interactions and, so, cause and effect still relate all the way through the throat of the wormhole," they enlighten.

So while the theory of general relativity calculates that an object reaching a black hole will be wrinkled along one direction and stressed along another infinitely, if we accept that the center of a black hole is a wormhole with a fixed radius, the object can merely be crushed just as much as the size of the wormhole.
This means according to Rubiera-Garcia's theory, an object could complete a journey through a wormhole and make it out the other side - and possibly to another universe - theoretically intact, but it would be creased to the size of the finite wormhole. At least it’s not totally destroyed, right?

"For a theoretical physicist, the pain of observers is admissible (one might even think it’s a part of an experimentalist’s work) but their total demolition is not," Rubiera-Garcia and his squad quip in an opinion piece.

In anticipation of we figure out how to actually see a black hole, all of this is going to stay well and truly in the land of pure hypotheticals. But we are beginning to see how black holes might not be the terrible, existence-obliterating death setups we thought they were.

As Stephen Hawking said at a meeting back in August 2015 about his explanation to the information paradox: "The meaning of this lecture is that black holes aren’t as black as they are painted. They are not the everlasting prisons they were once thought. ... If you feel you are in a black Hole, just don’t give up. There’s a way out."



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