I just read "Black hole wars" by L. Susskind. Essentially he claims that a boundary contains all the information about the volume it encompasses. He proclaims this the holographic principle (HP).
My questions in regard to the holographic principle are:
1) Does the volume (3D) still exists or everything is 2D which for us (humans) appear as 3D (spatial dimensions only) ? Or is it just clever reductionism that 3D is real but we can described it with information on the boundary (like the entropy of a black hole).
2) If the holographic principle is a general law of nature, how about scaling. If I have a disk (2D) can I describe it with a line (1D) ? Where it stops ? Singularity ?
3) How the HP fits with 9 spatial dimensions in the M-theory (the author proudly claims that the string theory nicely proofs the HP) ?
4) Why the time is untouched by the holographic principle ?