who says the laws of physics have to work the same in all parallell worlds?¿
The same physics that proposed the existence of parallel worlds to solve certain aspects of QED in the first place.
Those theoretical parallel worlds are part of our universe.
Also, seeing are there are damn few ways to "combine" elementary particles and forces to create a universe in which life as we understand it can exist, with the alternate universe in
Fringe peopled with people, the laws of physics there are the same as they are here.
Face it, the sleep deprived hacks in the
Fringe writers' room are simply throwing together whatever shit pops into their collective minds in order to ram home the idea of there being an alternate universe. Do you seriously think anyone actually took some the time to work out the many implications in the map which has been posted here? Or the implications of there being no airplanes? Or a copper-colored Statue of Liberty? Or the existence of the Grand Hotel?
They've worked out none of the things mentioned here, of course, because they're just dropping whatever "cool" bits they can quickly think of into the show in order to signal to the trailer park inhabitants network television is aimed at that the alternate universe is "alternate". When Jimmy John Joe Bob and Krystal see a zeppelin they can remark to each other over the Kool Whip that the "Boy Howdy, that Otherside sure is different, huh?".
Trying to come up with plausible explanations for what essentially are throw away bits in the
Fringe script is as fruitless as Trekkies trying to come with plausible reasons why Klingons grew horseshoe crabs on their heads between the 1960s and 1980s.
Remember, it's a TV show. We're lucky it make as much sense as it does.