In the article We've seen signs of a mirror-image universe that is touching our own in the popular magazine “New Scientist” (which describes a real scientific theory though, though in a popular form, but I think that's not a problem in this case) one can read that Leah Broussard has dusted off an already old theory (by Lee and Yang), and tried to reanimate it: The Mirror Universe.
It says, for example:
The article you are reading is written back to front.
But how can this be? I can imagine that the clock goes backward (though not time itself). Just look in the mirror and you'll see it's true.
But when I look in the mirror I can't see that someone who's writing a piece of text starts at the end and working his/her way to the beginning. What I do see though is that the one who writes starts at the beginning but writes from the right to the left, like in Arabic (you can check this out again by looking to someone who's writing in a mirror). Now, according to me, someone can't write a book from the back to the cover. Causality is violated here. Can the dead come out their graves alive, growing "older" until they are being pushed back in the uterus, after which they get smaller and smaller until only semen and an egg is all that's left and one can say they are dead.
Now, do I interpret the quote wrong, or are texts really written backward from the end to the beginning?
In the answer by@PM 2Ring (below) one can read:
The t=0 instant of the Big Bang is at the left side of that diagram, and time progresses towards the right side. Make a mirror-image of that diagram, with its t=0 Big Bang point on its right side, so time in that diagram progresses towards the left.
How can the arrow of time have two different directions? I mean, of course, you can mirror an arrow. But time in both Universa proceeds in the same way as in ours (or relative to ours: if 100 000 years have passed in our Universe then also in the Mirror Universe this "amount" of time will also have passed. Also from our point of view time in the MU passes normally and only the direction of time's arrow is different.
Doesn't this mean that time isn't really going backward which is implied by my first quote (surely the clock ticks opposite to ours, just look in a mirror to see this) and the only differences between these two Universes are the fact that we see only particles while in the MU
I know this is not mainstream (at this time anyway), and maybe a link can be laid with the Rishon model which proposes a substructure of quarks and leptons and says that in our Universe there are equal amounts of matter and anti-matter, and maybe another Universe where all the particles are the anti-particles of ours (though the amount of Rishons and anti-Rishons is the same in both Universes, they are differently combined in each), but I'm really fascinated by this theory and that's why I nonetheless ask this question.