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In the last issue of Contactless payment http://www.contactlesspaymentcards.com demonstrated how a model consisting of a few assumptions and a set of rules can lead to much unexpected results: multiverses and doppelgangers!

Today, I’ll briefly describe a different way we can arrive at a duplicate you. Most of you are familiar with the expression "history repeats", but have you ever taken this literally?

The Poincare recurrence theorem states that certain systems will, after a sufficiently long but finite time, return to a state very close to the initial state.

This means conceptually our universe can return to a previous state. Simply stated, given enough time, our universe because of random quantum fluctuations will "repeat" and the state of all the particles in the universe will match a state that occurred in the past; history will literally repeat!

Pretty cool right? How much time are we talking about though? The amount of time it would take for the entire universe to return to a state that is relatively the same as it is today is called the Poincare recurrence time.

The high estimate for this is 10^10^10^10^10^1.1 years. Now that is a BIG number.

Sadly, in the years since this was first described a number of scientists and researchers, including David Layzer and Arthur Eddington, have demonstrated it is statistically and realistically improbable for the universe as a whole to return to exactly the same circumstance of an early time. It is still fun think about it though!