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sinba
 sinba      23.06.2004 - 19:15:30 , level: 1, UP   NEW
:)

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crowd​ control
 crowd​ control      23.06.2004 - 18:37:16 , level: 1, UP   NEW

Stephen Hawking on quantum black holes:
The quantum theory of black holes...seems to lead to a new level of unpredictability in physics over and above the usual uncertainty associated with quantum mechanics. This is because black holes appear to have intrinsic entropy and to lose information from our region of the universe.

The Universe in a Nutshell by Stephen Hawking

Saturday January 5, 2002
The Guardian

Apparently, a large number of the many millions who bought A Brief History of Time got stuck on page one. Oh dear. I expected more of my readers. With this in mind, I have now simplified some of the ideas in the hope you will make it to page two. But since you had no idea of what I was talking about first time round, this is almost certainly a total waste of time.
Still, as Einstein pointed out, there is no universal quantity called time. Instead, everyone has his or her own personal time; and mine, dare I say it, is more valuable than yours. This is one of the postulates of the theory of relativity - so called because it implied that only relative motion was important.

Relativity was not compatible with Newton's law of gravity, and from this Einstein inferred that it is not space that is curved, but spacetime itself. This led us to understand that the universe is expanding. Sadly, relativity breaks down at Big Bang because it is not compatible with quantum theory. Alas, despite having worked on this problem myself, we still don't have a grand unified theory of the origin of the universe.

But back to time. Although I have my own personal time, I cannot actually say what it is. I can only describe the mathematical model for it.

The singularity theorems of Roger Penrose and myself established that spacetime is bounded to the past by regions in which quantum gravity is important. So to understand the universe we need a quantum theory of gravity.

Supersymmetries provided a natural physical mechanism to cancel the infinities arising from ground state fluctuations. This led to the discovery of supergravities and superpartners. However, in 1985, people realised there was no reason not to expect infinities and this led to one dimensional extended object superstring theories.

But that wasn't it; Paul Townsend found there were other objects that could be extended in more than one dimension. He called them p-branes - or pea brains, as I like to call them. Ho ho. And these could be found as the solutions of the equations of supergravity theories in 10 or 11 dimensions.

(10 or 11 dimenzii neboj sa ma sa to kde skryt stale)

Which leads us to time measured in imaginary numbers. Did you know that Richard Feynman proposed the idea of multiple histories of the universe? Just imagine it: there's even a history where you understand this book.