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It's possible there is no assymetry at all- maybe there are equal numbers of universes and antiverses, with opposite arrows of time (one expanding while the other contracts and vice versa) and made of dimensions that are complementary to the other.
That is what I am suspecting... However I don't think you need more than just a negative direction in time. For me, treating the entire universe like a Feynman diagram would say that an antimatter universe should propagate in a negative time direction. But that does create a question, would this antiverse be apart or part of our universe? Being that does it represent a violation in energy conservation or its solution, or does it represent a non-closed energy system. It would make sense... I don't know though.
" (Not really a theory, just an educated guess):
I like that idea, but conservation laws should be kicked up to another level- they may hold true across the omniverse but violated in individual universes.
Read this- this professor has some great ideas that may be receiving some verification (check out the footnotes). There is also more evidence for a cyclic universe and big bounce rather than big bang.https://en.wikipedia.org/wiki/Laura_Mersini-Houghton
Laura Mersini-Houghton (née Mersini) is an Albanian-American cosmologist and theoretical physicist, and professor at the University of North Carolina at Chapel Hill. She is a proponent of the multiverse hypothesis and the author of the theory for the origin of the universe, which holds that our universe is one of many selected by quantum gravitational dynamics of matter and energy. Predictions of her theory have been successfully tested by astrophysical data. She argues that anomalies in the current structure of the universe are best explained as the gravitational tug exerted by other universes.https://en.wikipedia.org/wiki/ULAS_J1120%2B0641
ULAS J1120+0641 is the second most distant known quasar as of 6 December 2017, after ULAS J1342+0928. ULAS J1120+0641 (at a comoving distance of 28.85 billion light-years[note 1]) was the first quasar discovered beyond a redshift of 7. Its discovery was reported in June 2011. [note 2]https://en.wikipedia.org/wiki/ULAS_J1342%2B0928
ULAS J1342+0928 is the most distant known quasar detected and contains the most distant and oldest known supermassive black hole, at a reported redshift of z = 7.54, surpassing the redshift of 7 for the previously known most distant quasar ULAS J1120+0641. The ULAS J1342+0928 quasar is located in the Boötes constellation. The related supermassive black hole is reported to be "800 million times the mass of the sun".https://en.wikipedia.org/wiki/Laura_Mersini-Houghton#cite_note-twsNationalNews-10