- #36
PeterDonis
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DaveC426913 said:A singularity can contain a whole lot of things
No, it can't. A singularity can't "contain" anything since it's not part of the manifold at all.
DaveC426913 said:A singularity can contain a whole lot of things
OK, I was sloppy.PeterDonis said:No, it can't. A singularity can't "contain" anything since it's not part of the manifold at all.
DaveC426913 said:Oriel was suggesting a singularity** is "nothing".
DaveC426913 said:The singularity at the centre of a black hole is beyond our current physics, yet the mass of the BH is in there
DaveC426913 said:it's simply physics we can't model yet
Feyneman Lecture Notes on Physics is one of the best. I believe its a free download from an archive.Nick Levinson said:@phinds:
Yes, but I don't have a TV and (Covid-19 era aside) I read books by scientists, not just science writers. A book that's 200-300 pages tends to have more depth than a 30-minute TV show. A book is for a more selective audience. TV is for the millions, averaged.
A trap is in judging the quality of a source by its conclusions. Sometimes, yes, choosing what we agree with can be informative. But better to rely on agreement with starting points and logic; but that's more difficult.
Math is anathema to most lay readers, so editors counsel scientists away from it, too often for my taste.
Undergraduate and graduate texts tend not to be available in public libraries. One librarian said if they buy them they tend to get questioned by management, apparently because school libraries get them, so it would be duplicative. I think they're also more expensive and perhaps get stolen more. Interlibrary loan can get them but with more limited renewals; and my local library won't spend more than $15 to borrow an ILL book, so nothing can come from Harvard etc.
No. It is the equation that defines the the singularity that includes the mass. Take a neutron, it has a location as a point. The point is defined by the neuton's wave function and interacts at action potential, based on that wavefunction, with other particles. Most atoms have an interaction area with neutrons by a few barns (an area measure), but 10Boron is 9000 barns and 157Gadolinium is 254,000 barns. Mass whose representation is gravity, but gravity is not a force, it is a field. It is the efect of mass warping space-time. We assume that mass pre-blackhole collapsed in a singularity. But the only thing we can observe is effects in the event horizon. Any conjectures as to the effects of a black hole is to the other 6 dimensions of string theory?DaveC426913 said:Hang on.
A singularity can contain a whole lot of things in large amounts. Mass for example. That's not nothing.
And it's not the same thing as infinite.
shjacks45 said:Take a neutron, it has a location as a point. The point is defined by the neuton's wave function