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A Five-Dimensional Black Hole Could 'Break' General Relativity, Say Physicists

For the first time ever, physicists have magnificently simulated what would occur to black holes in a five-dimensional world, and the way they act could threaten our essential understanding of how the Universe works. According to this simulation, if our Universe is made up of five or even more dimensions - something that researchers have struggled to approve or negate - Einstein's general theory of relativity, the base of modern physics, would be incorrect. In other words, five-dimensional black holes would comprise gravity so powerful, the laws of physics as we know them would eventually fall apart.

In a five-dimensional universe, physicists have theorized that black holes are more like very tinny rings instead of just holes, and as they grow, they can contribute increase to a sequence of 'bulges' that become thinner and thinner with time, and ultimately break off to make mini black holes elsewhere.

These ring-shaped black holes (also known as 'black rings') were initially suggested in 2002, but until now, no one’s been able to effectively simulate their growth.

This has been made conceivable thanks to the COSMOS supercomputer at the University of Cambridge in the UK - the biggest shared-memory computer in Europe that can achieve 38.6trillion calculations per second.

The difficultly with five-dimensional black holes is that they’re believed to comprise of 'ultragravity rings', where gravity is so powerful, it gives upsurge to a state called Naked Singularity. Naked singularity is an occurrence so extraordinary, no one actually knows what would happen inside it, excluding that the laws of general relativity simply would no longer apply.

Theoretical physicist MarkusKunesch from the University of Cambridge, says "As long as singularities stay hidden behind an event horizon, they do not cause trouble and general relativity holds - the 'cosmic censorship conjecture' says that this is always the case. As long as the cosmic censorship conjecture is valid, we can safely predict the future outside of black holes."

But what if singularity could occur just outside a black hole's event horizon? Physicists have theorized that in five or more dimensions, if an object that has shrunken to an infinite density – called singularity - is not restricted by an event horizon, it turn into naked singularity, and things would get so cracked in and around that object, we'd need to totally rethink our understanding of how physics works.

Kunesch and his group scientists say they've just about reached the limits of what their supercomputer can simulate, but would like to work out what it is about four-dimensional universes that create naked singularity impossible, and general relativity right. Tunyasuvunakool says "If cosmic censorship doesn't hold in higher dimensions, then maybe we need to look at what's so special about a four-dimensional universe that means it does hold,"

The research has been issued in Physical ReviewLetters, and here you can learn about 11 dimensional universeexplained by Michio Kaku.

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