Tagged Questions
4
votes
2answers
334 views
Is spacetime an illusion?
In consistent histories, for gauge theories, can the projection operators used in the chains be not gauge invariant?
In quantum gravity, for a projection operator to be gauge invariant means it has ...
3
votes
1answer
383 views
The Universe is a Hologram
First my background: no physics, but Ph.D. in math. I was reading this article on Slashdot. It links to this Wikipedia page. The content of the Slashdot article is that some physicists believe the ...
8
votes
8answers
2k views
What are cosmological “firewalls”?
Reading the funny title of this talk, Black Holes and Firewalls, just made me LOL because I have no idea what it is about but a lively imagination :-P (Sorry Raphael Bousso but the title is just too ...
7
votes
1answer
604 views
In what sense does the universe have an outer edge?
I'm having trouble understanding something about Suskind's Holographic principle. Suskind speaks about the surface of the universe? In what sense does the universe have an outer surface? I'm a bit ...
