The Hunt for a Multiverse...?
Excerpts:
"For many, the multiverse conjures images of worlds where dinosaurs continue to roam, Nazis won World War II, and your evil twin is wreaking havoc somewhere. And yet, the multiverse isn’t just an accepted theory in modern physics, it’s almost unavoidable.
Take the theory of inflation as an example, which says that in the first split second following the Big Bang, the early universe ballooned outward to be at least a million billion billion times larger than it was. Although the theory is beloved by cosmologists (it fixes several problems with the Big Bang story), it comes with a caveat: Most theories of inflation predict eternal inflation. That means that not only did our universe balloon outward, but an infinite number of other universes did, too."
"I think when you use the phrase parallel universe, people imagine some sort of portal into the underworld or some other dimension,” says Matthew Kleban, an astronomer at New York University. Instead, he likes to think of a multiverse as a series of islands.
Take Hawaii, as an example. From Maui, you might not be able to see any other islands beyond the horizon. In fact, you might not even know they exist until an exotic tree — one that clearly doesn’t grow on your island — happens to land on your beach one day. Evidence of a nearby universe would be no different than stumbling upon that tree."
"It sounds wild. But the idea that we live in a multiverse — a cosmos where an infinite number of universes exist beside our own — is no longer confined to science fiction. It’s a respectable theory among scientists, so much so that some are on the hunt for proof of a nearby universe.
Now, scientists might be one step closer. A study recently submitted to “Monthly Notices of the Royal Astronomical Society” actually places the multiverse theory on firmer ground. Ruari Mackenzie, a graduate student at England’s University of Durham, took a deeper look at a region in the sky that’s so frigid and so large that most scientists don’t think it can be a statistical fluke. Instead, some astronomers think this so-called “cold spot” is an optical illusion produced by a lack of intervening galaxies. But Mackenzie and his colleagues found that those galaxies are no less dense than anywhere else in the universe, disproving that theory.
Believe it or not, the next reasonable explanation (so long as you don’t buy into the theory that it’s just a statistical fluke) is that the cold spot might be a bruise left after an ancient collision with another universe. There’s no proof — at least not yet. But a forthcoming map of the cold spot might let scientists nail down whether it is truly a footprint of another universe — a result that would turn our understanding of the universe on its head."
Read full article here
Excerpts:
"For many, the multiverse conjures images of worlds where dinosaurs continue to roam, Nazis won World War II, and your evil twin is wreaking havoc somewhere. And yet, the multiverse isn’t just an accepted theory in modern physics, it’s almost unavoidable.
Take the theory of inflation as an example, which says that in the first split second following the Big Bang, the early universe ballooned outward to be at least a million billion billion times larger than it was. Although the theory is beloved by cosmologists (it fixes several problems with the Big Bang story), it comes with a caveat: Most theories of inflation predict eternal inflation. That means that not only did our universe balloon outward, but an infinite number of other universes did, too."
"I think when you use the phrase parallel universe, people imagine some sort of portal into the underworld or some other dimension,” says Matthew Kleban, an astronomer at New York University. Instead, he likes to think of a multiverse as a series of islands.
Take Hawaii, as an example. From Maui, you might not be able to see any other islands beyond the horizon. In fact, you might not even know they exist until an exotic tree — one that clearly doesn’t grow on your island — happens to land on your beach one day. Evidence of a nearby universe would be no different than stumbling upon that tree."
"It sounds wild. But the idea that we live in a multiverse — a cosmos where an infinite number of universes exist beside our own — is no longer confined to science fiction. It’s a respectable theory among scientists, so much so that some are on the hunt for proof of a nearby universe.
Now, scientists might be one step closer. A study recently submitted to “Monthly Notices of the Royal Astronomical Society” actually places the multiverse theory on firmer ground. Ruari Mackenzie, a graduate student at England’s University of Durham, took a deeper look at a region in the sky that’s so frigid and so large that most scientists don’t think it can be a statistical fluke. Instead, some astronomers think this so-called “cold spot” is an optical illusion produced by a lack of intervening galaxies. But Mackenzie and his colleagues found that those galaxies are no less dense than anywhere else in the universe, disproving that theory.
Believe it or not, the next reasonable explanation (so long as you don’t buy into the theory that it’s just a statistical fluke) is that the cold spot might be a bruise left after an ancient collision with another universe. There’s no proof — at least not yet. But a forthcoming map of the cold spot might let scientists nail down whether it is truly a footprint of another universe — a result that would turn our understanding of the universe on its head."
Read full article here