07-23-2010, 01:50 PM
(07-23-2010, 09:51 AM)billy Wrote: the black hole isn't the singularity. the event horizon denotes that (the point of no return)
Quote:The two most important types of spacetime singularities are curvature singularities and conical singularities. Singularities can also be divided according to whether they are covered by an event horizon or not (naked singularities). According to general relativity, the initial state of the universe, at the beginning of the Big Bang, was a singularity. Another type of singularity predicted by general relativity is inside a black hole: any star collapsing beyond a certain point would form a black hole, inside which a singularity (covered by an event horizon) would be formed, as all the matter would flow into a certain point (or a circular line, if the black hole is rotating). These singularities are also known as curvature singularities.http://en.wikipedia.org/wiki/Gravitational_singularity
You seem to be saying that the event horizon is the black hole, and inside the black hole there may or may not be a singularity, depending on whether the black hole forms one? I'm not saying this is wrong, but my understanding is that the event horizon is the result of there being an underlying singularity, and that the singularity itself is the black hole regardless of whether it has an event horizon or is a "naked singularity". Want to nail down these concepts?
(07-23-2010, 09:51 AM)billy Wrote: the patch people hope to show their theory is good the same way people showed that light can bend due to gravity.
They're going to photograph Mercury during a solar eclipse?
![[Image: doh.gif]](http://i485.photobucket.com/albums/rr217/darkside_999/doh.gif)
Seriously, what evidence of causal patches are they proposing we look for? Has someone invented a cause-o-meter?
![[Image: haha.gif]](http://i485.photobucket.com/albums/rr217/darkside_999/haha.gif)
What are they, exactly?
(07-23-2010, 09:51 AM)billy Wrote: ... and just because radiation exists it doesn't mean that hawkins is right.
BTW, the world's most prominent theoretical physicist is Hawking, old sod, not Hawkins. It's not a question of his being right -- I'm not a cheerleader for evaporating holes. The point is the distinction between "verified" and "verifiable" hypotheses. A theory is verifiable if some reasonable means can be envisioned to test it in the real world. Black holes are known, and radiation is detectable. It's just a matter of working out the details.
(07-23-2010, 09:51 AM)billy Wrote: as for our demands on how time should work. it isn't a demand but a deduction. as it stand physicists have a problem with time only belling allowed through the laws of physics to travel one way. it doesn't seem to fit the current model.
I wasn't aware of that problem. Can you enlighten me? It seems that the whole concept of entropy is tied to time moving only in one direction, isn't it?
(07-23-2010, 09:51 AM)billy Wrote: deduction is how many laws of physics were discovered. gravity, a vacuum , gravity to name 3.You forgot vacuum -- that's four.
