Can anyone give me a basic definition of what the "Holographic Principle" is, exactly? Or care to discuss the idea at all? Thanks.
This by Raphael Bousso is an impressive article, which appeared in American Physical Society'sOriginally posted by Ambitwistor
There are various technical definitions floating around, but the basic idea is that the information about all the physics going on within a region of space is actually captured by, and may be reconstructed from, the physics going on just at the boundary of that region.
Here is a review:
It's technical, but you can skim over the math.
There is a layman-oriented discussion of the holographic principle in the book, Three Roads to Quantum Gravity by Lee Smolin.