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British physicist Stephen Hawking may have died in March, but his legacy is still unfolding.
The prominent theoretical physicist and cosmologist co-authored a research paper about the existence of parallel universes similar to our own, which the Journal of High-Energy Physics posthumously published on Friday.
originally posted by: neoholographic
I have been saying for years, that parallel universes exist and these universes are just like our universe or very similar. This is because of the fine tuned universe and the expansion of space.
British physicist Stephen Hawking may have died in March, but his legacy is still unfolding.
The prominent theoretical physicist and cosmologist co-authored a research paper about the existence of parallel universes similar to our own, which the Journal of High-Energy Physics posthumously published on Friday.
Here's the key:
Thomas Hertog, a co-author of the study, told the BBC that he and Hawking were wrestling with the idea that the Big Bang actually resulted in the creation of multiple “pocket universes” that exist throughout space. It was unclear to them whether the laws of physics that apply in our universe would also apply in these alternate universes.
“In the old theory there were all sorts of universes: some were empty, others were full of matter, some expanded too fast, others were too short-lived. There was huge variation,” said Hertog, a physics professor at the Catholic University of Leuven (KU Leuven) in Belgium. “The mystery was why do we live in this special universe where everything is nicely balanced in order for complexity and life to emerge?”
Hertog and Hawking’s paper uses new mathematical techniques to restore order to previously chaotic views of the multiverse, suggesting that these different universes are subject to the same laws of physics as our own.
www.huffingtonpost.com...
THERE WAS HUGE VARIATION.
This has everything to with the fine tuned universe. The reason all of these theories seem to break down is because many of these Scientist are trying to escape fine tuning of the universe.
So you say, things like there's 10^500 false vacua so any value of the Cosmological Constant can occur. So you get every type of space and all sorts of different physics. So basically, we're just on setting on a dial of infinite values that can occur. This is just hogwash. There's no evidence at all to support the notion that all of these different spaces with all of these different physics can occur.
We know our universe can occur. Therefore, you have pocket universes that share the same physics as our universe expanding ad infinitum. Because the configurations of matter are limited by the laws of physics and the fine tuning of our universe there will be infinite earths with infinite versions of you.
There will be universes where you don't exist as well.
It would be like an infinite Poker universe. You would have space expanding faster than light, so pocket universes would form but it's limited as to what kind of universe you can have based on the laws of the game and the limit of 52 cards that can be dealt. So you will get two pair universes and full house universes ad infinitum. You would have more two pair universes over full house universe because there's more configurations that give you a full house unless there's FINE TUNING of the cards and you get more full house universes over time.
It's simple, space expands faster than light, so there's going to be pockets because we can't see all of expanding space. Objects just don't vanish because we can't see them. So you have pockets where you have enough of what we call matter to overcome the Cosmological Constant locally. So for a time, you will get universes like ours but eventually everything will be pulled apart.
So our pocket began with faster than light expansion of space but pockets formed where matter became concentrated. It's like riding a bike real fast and then you coast. Eventually you will come to a full stop, but with the universe it never comes to a full stop. So overtime, if you don't get more matter in the pocket, it will slowly pull everything apart in order to get back to fast expansion but the cycle will just start again and more pockets will form.
You don't need 10^500 false vacua and all of these other theories. Just based on what we know, pocket universes have to exist and most of them are just like ours. This means they share the same physics but this doesn't mean earth has to exist in every universe. IOt just means earth will exist in an infinity of these pocket universes if the expansion of space is infinite. You would have infinities, within infinities, within infinities in an infinte expansion of space.
Based on this we conjecture that the exit from eternal inflation does not produce an infinite fractal-like multiverse, but is finite and reasonably smooth.
"The usual theory of eternal inflation predicts that globally our universe is like an infinite fractal, with a mosaic of different pocket universes, separated by an inflating ocean," Hawking explained.
"The local laws of physics and chemistry can differ from one pocket universe to another, which together would form a multiverse. But I have never been a fan of the multiverse. If the scale of different universes in the multiverse is large or infinite the theory can't be tested."
Hawking and Hertog are now saying that the eternal inflation model is wrong. This is because Einstein's theory of general relativity breaks down on quantum scales.
"The problem with the usual account of eternal inflation is that it assumes an existing background universe that evolves according to Einstein's theory of general relativity and treats the quantum effects as small fluctuations around this," Hertog explained.
"However, the dynamics of eternal inflation wipes out the separation between classical and quantum physics. As a consequence, Einstein's theory breaks down in eternal inflation."
In string theory, the holographic principle proposes that a volume of space can be described on a lower-dimensional boundary; so the universe is like a hologram, in which physical reality in 3D spaces can be mathematically reduced to 2D projections on their surfaces.
The researchers developed a variation of the holographic principle that projects the time dimension in eternal inflation, which allowed them to describe the concept without having to rely on general relativity.
This then allowed them to mathematically reduce eternal inflation to a timeless state on a spatial surface at the beginning of the Universe - a hologram of eternal inflation.
"When we trace the evolution of our universe backwards in time, at some point we arrive at the threshold of eternal inflation, where our familiar notion of time ceases to have any meaning," said Hertog.
According to the new theory, the early Universe did have a boundary, and that's allowed Hawking and Hertog to derive more reliable predictions about the structure of the Universe.
"We predict that our universe, on the largest scales, is reasonably smooth and globally finite. So it is not a fractal structure," Hawking said.
It's a result that doesn't disprove multiverses, but reduces them to a much smaller range - which means that multiverse theory may be easier to test in the future, if the work can be replicated and confirmed by other physicists.
Because the configurations of matter are limited by the laws of physics and the fine tuning of our universe there will be infinite earths with infinite versions of you.
Hawking and Hertog argue that, in fact, eternal inflation does not occur. To do that, they borrow a concept from string theory that enables them to equate two different types of theories with different dimensionalities. In 1997, Argentine-American theorist Juan Maldacena considered a volume of space in which gravity was at work. Maldacena, who is now at the Institute for Advanced Study in Princeton, New Jersey, then demonstrated that theory was equivalent to an easier-to-work-with quantum theory on the boundary of the space that didn’t include gravity. It’s like saying whatever goes on inside a can of soda can be captured by a theory describing only what’s happening on the can’s surface.
Eternal inflation emerges because, in the very early universe, the quantum fluctuations in the field that drives inflation are as big as the field’s average value. But Hawking and Hertog argue that under those conditions one cannot simply carry on with Albert Einstein’s general theory of relativity, but instead must use a maneuver like Maldacena’s to view the entire situation in a space with one less dimension. In that alternative space, things are more tractable, they claim, and the physics does not lead to eternal inflation. Instead, a single, well-behaved universe merges.
That’s where things get interesting—and tricky. The concept of equating one theory to another in a space with one fewer dimension is known to theoretical physicists as holography. In his work, Maldacena equated one theory to another in a space with one less spatial dimension. But, Hertog argues, the principle of holography allows theorists to jettison the dimension of time, instead. So in Hawking’s and Hertog’s theory, through the principle of holography, the very early universe should be described by a theory with just three spatial dimensions and no time.
Despite how extreme the idea sounds, theories about the Universe being an illusion or a hologram aren't new. Now, researchers claim to have found evidence towards proving this hypothesis.
A team of theoretical physicists at the University of Southampton believes it has found signs our Universe is an illusion by studying the cosmic microwave background (CMB) – radiation left over from the Big Bang.
The holographic Universe means information that makes up what we perceive as a 3D reality is stored on a 2D surface, including time. This means, essentially, everything you see and experience is an illusion.
"Imagine that everything you see, feel and hear in three dimensions, and your perception of time, in fact emanates from a flat two-dimensional field,” says Professor Kostas Skenderis from the University of Southampton.
“The idea is similar to that of ordinary holograms where a 3D image is encoded in a 2D surface, such as in the hologram on a credit card. However, this time, the entire Universe is encoded." Another way of simplifying this is through 3D films. Although not an example of a hologram, 3D films create the illusion of 3D objects from a flat 2D screen. The difference in our 3D Universe is that we can touch objects and the 'projection' is 'real', from our perspective.
originally posted by: howtonhawky
He sure did make it sound in that last paper that we may just all be cells of someones brain.
Close by proximity and design.