(ORDO NEWS) — Scientists have put forward the theory that outside our universe there may be an “anti-universe”, in which time flows backwards.
The theory is based on the fact that nature has a set of fundamental symmetries, the most important of which are charge, parity and time.
In particular, if the charges of particles are reversed when interacting with their opposite charge, then the same interaction (charge) will occur.
If you look at the mirror image of the interaction, you get the same result (parity), and if you drive the interaction back in time, it will look the same (time).
Sometimes these symmetries are broken, but physicists have never observed a combination of all three symmetries breaking at the same time. This fundamental symmetry has been called CPT with respect to charge, parity and time.
In a new paper published in Annals of Physics, a group of scientists propose extending this concept of combined symmetry to the entire universe, suggesting that the early universe was small, hot and dense, and so uniform that time was both backward and forward symmetric. forward direction.
Based on this concept, the view of our universe, where evolution moves forward in time, must be expanded to include a mirror image that moves backward in time.
The theory can explain the existence of dark matter. Scientists suggest that this may be an invisible particle that interacts only through gravity and is a twin of the three known varieties of neutrinos in our Universe: the electron neutrino, the muon neutrino and the tau neutrino.
All three varieties of neutrinos are described as left-handed due to the direction of spin relative to motion, and all other particles known in physics have both left-handed and right-handed versions.
If the universe obeyed the CPT rules, this would require the existence of at least one right kind of neutrino.
The researchers found that the conditions created in such a universe meant it was full of right-handed neutrinos, enough for dark matter to exist.
Apart from the fact that the theory offers a potential explanation for dark matter. The theory implies that there would be no need for the expansion of the Universe after the Big Bang, because the “observing” CPT Universe would naturally expand and fill with particles.
We may never be able to access this alternate universe if it exists, but future experiments to look for gravitational waves or confirm the neutrino mass could prove the theory correct.
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