Until recently, asking physicists what happened before the Big Bang was considered a question that didn’t make sense from a scientific view but a new theory called Loop Quantum Gravity (LQG) has emerged suggesting the possibility of a “quantum bounce,” where our universe stems from the collapse of a previous universe. However no observations of our current universe could lead to any understanding of the state of the pre-bounce universe, as nothing was preserved across the bounce - a form of “cosmic amnesia.”
Now two scientists have modified the theory showing that relative fluctuations of volume and momentum in the pre-bounce universe are conserved across the bounce. “This means that the twin universe will have the same laws of physics and, in particular, the same notion of time as in ours,” says Parampreet Singh from the Perimeter Institute for Theoretical Physics in Ontario. “In our analogy, it will look identical to its twin when seen from afar; one could not distinguish them.”
Does this mean there was another you that existed at some point, someone who has already lived your life? “If one were able to look at certain microscopic properties with a very strong microscope – a very high-energy experiment probing the Planck scale – one might see differences in some quantities, just as one might see that twins have different fingerprints or one has a mole and the other does not, or a different DNA,” Singh added.
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