some genuinely fascinating theories.
i really like the way this manga tries to tie science into the foundation of magic.
for those who are feeling confused, i'll try to explain the basic idea they were discussing.
at least according to my understanding.
the world as we know it exists in three dimensions, plus time.
that said, this does not mean that other dimensions do not exist. it's just that we can't perceive them.
when they mention that the dimensions exist everywhere, think of it like this.
say you have a sheet of paper. you place it on a table. this is a representation of a square, a 2D object.
we draw a stick figure on it. that figure is again a 2D representation of an object.
let's say that figure is alive, and it can only perceive two dimensions.
that said, it is only a representation. it is still a 3D object. the paper has some thickness to it, however slight.
the stick figure doesn't know that. but we, as higher dimensions beings, know that a third dimensions exists. which is thickness. but the figure cannot perceive this extra dimension.
This third dimension is everywhere. at no point is the paper 2D to us. it is always a 3D object.
in the same vein, magic is simply a manipulation of these higher dimensions.
say we put a string on the paper. and the stick figure can see the string where it touches the paper.
if we move the string around, to the stick figure, it is moving by magic. is we lift it off the paper, the string would vanish from the 2D world. but we know it still there, it's just moved elsewhere in this extra dimension of ours.
Then you have the bit where gravity and time lines and stuff come in.
over here, imagine a really, really long plastic straw.
imagine a bunch of them.
each is a separate reality. this is basically multiverse theory, which many who read isekai should have a general idea of. the manga does mention converging multiverses and such, but i'm not sure how to explain that so i'll leave that for now, but there should be good explanation on YouTube.
so normally, the straws just run on and on on their path.
what's happening with our world and their world is that our straws are touching. somehow.
and because they are touching, imagine that where they touch, the straws sort of meld together. this is the 'GATE' which allows travel between the two worlds.
now, i'm not sure about this, since i don't remember any character using magic when they were in Japan, but it is possible that our world and their world (just gonna call it like that for convenience) have different fundamental forces, or different upper dimensions.
as a result of the GATE, these forces are beginning to interact and warp each other, causing disruptions in the basic compositions of the world (as can be seen by that string experiment the professor did)
an alternative is that both worlds have the same upper dimensions. however, the interaction is once again causing a disruption in the fundamental forces.
think of it like this.
we know that light bends when affected by the massive gravity of a black hole.
so, take our world as a green laser, and theirs as a red laser.
you have the lasers parallel to each other. they run straight, never meet.
now, you introduce a minor point of greatly increased gravity between them (like a black hole).
the path of these lasers becomes distorted, and they both bend towards this source of increased gravity. the lasers will still have their paths, but they may intersect at a point.
now, imagine the the gravity increases further. the laser deviate more.
increases further
and further
soon, the lasers disappear into the black hole.
and boom. worlds are gone.
the 'gravity' in this situation is the GATE.
or rather, the continued existence of it.
removing the gate and breaking the link would be like reducing the gravity.
re-introducing the gate would be like increasing the gravity again.
i hope this kind makes sense.
if i'm wrong anywhere please do correct me, or give your own ideas.