What Stephen Hawking's Last Theory Has To Say About The Universe

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'The creation of space and time goes together with the generation of gravitational waves in our theory, and perhaps the detailed pattern of those gravitational waves will give us a key signature of our model, ' Hertog says.

The pre-print version of the paper - titled "A Smooth Exit From Eternal Inflation?" - has been circulating for months.

"It is a deeper understanding of where the laws of physics that we test in our labs come from".

But now his final theory could be about to cement his place in the 21st century as it suggests that our universe may be one of many universes, but that unlike other suggestions, they all might be quite similar to our own.

Prof Hawking said before his death: "We are not down to a single, unique universe, but our findings imply a significant reduction of the multiverse, to a much smaller range of possible universes".

And that is what the paper is based on: Quantifying the background radiation from the beginning of time, which - if their theory is correct - should be measurable. Physicists could find the evidence of other universes using tools created to measure ripples in spacetime which is also known as primordial gravitational waves.

The pair proposed that prior to the Big Bang, there was space but no time.

This idea "resolved a difficulty with Einstein's theory that suggested that the universe began almost 14 billion years ago but said nothing about how it began", says the BBC. The belief is that once this process started, it never really stopped.

They claim we inhabit just one of these "pocket" universes in a region where inflation has ended.

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The huge section of the Milky Way galaxy is a mosaic of images from NASA's Wide-field Infrared Survey Explorer, or WISE.

The theory, in short, explains that the universe is a lot more simple and finite when compared to what many existing theories on the big bang say, notes a report by the University of Cambridge.

In an interview last Autumn, Hawking said that "the usual theory of eternal inflation predicts that globally our universe is like an infinite fractal", noting that he and Hertog instead predict that "our universe, on the largest scales, is reasonably smooth and globally finite".

Some, according to the theory, would be very like our own universe, while others would be subtly different.

The paper outlines a new idea about inflation, which is one of the theories physicists use to try to make sense of the Big Bang.

Hawkings final paper has solved the puzzle by drawing on new mathematical techniques developed to study another branch of physics called string theory.

So the new paper attempts to simplify things, challenging some of the assumptions of eternal inflation.

Hawking and Hertog theorize that there is a point where eternal inflation begins, and at that point it exists in a timeless state.

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