Welcome to this breaking news segment on the one and the
only Science-News.fm!!! The source of all things from under the sea, to the
world you see, even to the stars, we are your news source!! On today’s breaking
news…. the theory that our universe is contained inside a bubble, and that
multiple alternative universes exist inside their own bubbles – making up the
‘multiverse’ – is, for the first time, being tested by physicists.
Two research papers published in Physical Review Letters and
Physical Review D are the first to detail how to search for signatures of other
universes. Physicists are now searching for disk-like patterns in the cosmic
microwave background (CMB) radiation - relic heat radiation left over from the
Big Bang – which could provide tell-tale evidence of collisions between other
universes and our own.
Many modern theories of fundamental physics predict that our
universe is contained inside a bubble. In addition to our bubble, this
`multiverse’ will contain others, each of which can be thought of as containing
a universe. In the other 'pocket universes' the fundamental constants, and even
the basic laws of nature, might be different.
Until now, nobody had been able to find a way to efficiently
search for signs of bubble universe collisions - and therefore proof of the
multiverse - in the CMB radiation, as the disc-like patterns in the radiation
could be located anywhere in the sky. Additionally, physicists needed to be
able to test whether any patterns they detected were the result of collisions
or just random patterns in the noisy data.
A team of cosmologists based at University College London
(UCL), Imperial College London and the Perimeter Institute for Theoretical
Physics has now tackled this problem.
“It’s a very hard statistical and computational problem to
search for all possible radii of the collision imprints at any possible place
in the sky,” says Dr Hiranya Peiris, co-author of the research from the UCL
Department of Physics and Astronomy. “But that’s what pricked my curiosity.”
The team ran simulations of what the sky would look like
with and without cosmic collisions and developed a ground-breaking algorithm to
determine which fit better with the wealth of CMB data from NASA’s Wilkinson
Microwave Anisotropy Probe (WMAP). They put the first observational upper limit
on how many bubble collision signatures there could be in the CMB sky.
Stephen Feeney, a PhD student at UCL who created the
powerful computer algorithm to search for the tell-tale signatures of
collisions between "bubble universes", and co-author of the research
papers, said: "The work represents an opportunity to test a theory that is
truly mind-blowing: that we exist within a vast multiverse, where other
universes are constantly popping into existence."
One of many dilemmas facing physicists is that humans are
very good at cherry-picking patterns in the data that may just be
coincidence. However, the team’s
algorithm is much harder to fool, imposing very strict rules on whether the
data fits a pattern or whether the pattern is down to chance.
Dr Daniel Mortlock, a co-author from the Department of
Physics at Imperial College London, said: "It's all too easy to
over-interpret interesting patterns in random data (like the 'face on Mars'
that, when viewed more closely, turned out to just a normal mountain), so we
took great care to assess how likely it was that the possible bubble collision
signatures we found could have arisen by chance."
The authors stress that these first results are not
conclusive enough either to rule out the multiverse or to definitively detect
the imprint of a bubble collision. However, WMAP is not the last word: new data
currently coming in from the European Space Agency’s Planck satellite should
help solve the puzzle.
This has been breaking new from your friends
at Science-News.fm. Have an astronomical day!!