Interest-capturing start. I don't agree with the two gentlemen above, as this is not a story - this is an introduction to a story. We will find out later what lives in this place, what altered physics mean, and what happens in the 'verse.
There are three points where I recommend revision: first, carefully re-read your work for grammar and spelling - like "In this place the laws of physics is heavily altered". There will be those who will yell at me for being fussy over small things like that. To me, however, faulty grammar and spelling turns the piece into a parody - if it had any seriousness, consistently bad language takes all of that seriousness away.
The second point partly has to do with Virmir's concern - the technical aspect of the story. Personally, I am not a physics theorist. If this is a piece for physics theorists, then I'm sure they will enjoy it, but I found myself skimming the second part of the last paragraph - I simply couldn't keep up with what you were saying (even after the breakdown). You could always do what the Strugatski brothers do: throw a wobbling blob of technobabble at the reader and subsequently suck it apart through smaller conversations or paragraphs, so that even the village idiot will suddenly feel like he has a university degree, because he understands what was written. If you can do that, then you already have half of an amazing piece, which is both interesting and accessible. But in order to do that, you need to break the technobabble apart into manageable, swallowable chunks. What's an explanation worth if your reader doesn't even read the original text?
The last point, then: keep in mind the science you are creating. You go through an amazingly intricate description of the universe. However, the only purpose it serves (to me) is a scientific explanation for whatever kind of magic you will have taking place in your world. Ironically, that's the part that isn't clear. "...because this verse is encapsulated in the Grid, there's a certain energy flow through it (mana?) found nowhere else." - Where does this energy come from? Is it the conflicting tidal forces of the 'verse and the Grid(?) creating a great tension which can manifest as a type of energy? Is it some type of current that flows in the Grid and washes over the 'verse? Moreover, you mention that light is 100 times faster while the universe is smaller (but at the same time infinite: the hypersphere theory). Because of this, I assume the nights will be as bright as day in the world: no matter where you look in the night sky, your line of vision will always fall upon a star, and, unlike our universe, there is no vast space for the light to take time to cross (which is why we can't see most of the stars - they are so far that their light has not reached us yet). Again, I'm no physicist, so I might be wrong - but this is simply what I am assuming based on what you wrote.
Those things aside, I really do like this start. I am an avid science fiction reader, but only as long as the "science" part doesn't actually involve knowing every obscure theory the author bases the piece on.
