science has sent particals to other dimensions.......and we receive stuff back, where do you think dust comes from.....
other dimensions have been proven both mathmatically and at cern.......
I am not convinced. Are the laws of physics something fundamental that humans have discovered or are they formulated from observations of what we see around us?
Let's take the so called 4th dimension of Time. Newtonian time is something fundamental to physics but Kant said it is subjective to people due to memory and I am in the latter camp.
you can read about it here: http://christianhubert.com/writings/Time.html
but my view is we percieve time because we have a memory. Let's say we remember nothing then everything we see is in the present and we have no idea that anything has changed. It is like looking at a roll of cine film. If we have a memory and it is run we see stufff changing so we can formulate equations involving time to exaplain the movement. If we have no memory then nothing moves and so no equations involving time.
The mathematics is there to prove that time travel is possible - if that were so, why are we not inundated with visitors from the future?