RE: Getting grips on the pre-big-bang era with a universe/anti-universe pair
As we know a few of antiparticles are left after that famous big clash of matter and antimatter in the universe’s first moments. Yes, today the barionic matter is dominant but there are also some anti matter somewhere else in our universe.
This model actually also predicts the matter-antimatter asymmetry through thermal leptogenesis, which is something I haven't mentioned. This occurs through the existence of the two other heavier right-handed neutrinos (we have 3 of those guys in total). See here for more information.
So your post makes me think that there still be an anti-universe which corresponding to the one before the big bang. And it overlaps with our universe’s dimensions with a back flowing time. And those anti particles have barionic matter counterparts in that anti universe
Exactly. But I would say there is no really any overlap between both universe.
For the stupidity, it has been found. Check the other comments, you may get some hints ;)
Still, have some questions in my mind:
You mean (sorry they propose) that the 20% of universe's mass is composed of those right-handed neutrinos?
But this sounds a little bit strange to me. Because as you mentioned they are not observed yet. And maybe impossible to detect. Which makes them only theoretical particles such as axions or WIMPs. And by the way, Has this theory any explanation about dark energy as well? (I've taken a quick look at the paper you've linked, however, I need to read it at a later time in detail)
Yes, this is exactly what the model predicts.
They are by no means axions or wimps because they just don't interact at all with the Standard Model. They are not thermal relics but dark matter is here produced via another mechanism connected to gravity.
PS: sorry for the disappointment. There is a second link a couple of sentences later in the post :)