# 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 38.6 trillion 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 Markus Kunesch from theUniversity 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 universe explained by Michio Kaku.

**This post was written by Umer Abrar. To contact the author of this post, write to mirzavadoodulbaig@gmail.com or add/follow him on facebook :**

A five-dimensional black hole could 'break' general relativity, say physicists
Reviewed by Umer Abrar
on
2/19/2016
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