Stephen Hawking's final paper: Not a fan of the multiverse

Stephen Hawking's final paper: Not a fan of the multiverse

In the 1980s, Hawking, along with United States physicist James Hartle developed a new idea about the beginning of the universe, BBC News reported.

The final piece of work by Professor Stephen Hawking appears to heavily revise one of his most famous theories: that of endless multiple universes, each different from the last.

In order to carry out the research with Stephen Hawking on the multiverse, Hertog traveled to Cambridge - and towards the end, communication became very hard. The pair's theory is sophisticated (and quite speculative) but not all that hard to explain.

Many scientists claim that the universes may be endlessly nurturing each other, building a practically infinite set of fractal probabilities. However, there exist certain pockets like the one where our observable universe is and it just so happens to be a hospitable one where inflation has ended and stars, galaxies, and worlds formed.

In the new theory, instead of space being filled with countless universes where entirely different laws of physics apply, these alternate universes may not actually vary that much from one another.

In their new paper, Hawking and Hertog came up with a different take.

But if the Big Bang were to birth an infinite number of possible universes, all with different laws of physics, a lot of them would be hostile to the stable existence of the matter that makes up stars, planets and human beings - and of physics itself as we know it.

Some think this may still be continuing, producing a "multiverse" with many universes out there in addition to our own.

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Hawking and Hertog's paper relies on string theory, a branch of physics that tries to reunite quantum physics with gravity and Einstein's theory of relativity.

"However, the dynamics of eternal inflation wipes out the separation between classical and quantum physics", he continued.

The concept depends on the term "eternal inflation". "Now we're saying that there is a boundary in our past", Hertog said.

"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", Hertog told Cambridge.

"So it is not a fractal structure", said Hawking. Their assertions could be experimentally tested one day since the theory predicts that if the universe evolved as described, then telltale signs should be recorded in gravitational waves or in the cosmic microwave background, the radiation released by the Big Bang.

"We are not reduced to a single Universe, but our findings imply a considerable reduction of the "multiverse", to a much smaller range of possible universes", the professor said before his death.

Professor Hawking, died in March at the age of 76, passing away peacefully in his sleep.

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