by Markus Schwarz » Fri May 18, 2012 9:54 am
The headlines of the article reads: "Every Black Hole Contains a New Universe"
The article's first sentence reads: "Our universe
may exist inside a black hole. "(where I emphasized the may)
This is a recent trend that I find more often nowadays. The headline makes exaggerate claims, which the article (and probably the scientists as well) doesn't make. Especially with these kind of statements that are difficult to test, everybody should be very clear on what are actual facts and what are hypothesis.
grpotmesil wrote:Okay after watching the lecture and the other posts, I'll go with the concept that the singularity that resulted in our universe was the result of a black hole in another universe.
In the framework of general relativity, Penrose, Hawking, and others proved mathematically the existence of a "singularity" at the center of a black hole and in cosmology. Figuratively speaking, the presence of a singularity means that you can reach the "edge of spacetime" in a finite amount of time, and maybe "fall off the edge". These strange findings are taken by many as a sign that general relativity is no longer valid under these extreme conditions. In particular, the quantum nature of matter should also be taken into account. But since no one knows how to do this, the field is open to all kind of hypotheses.
grpotmesil wrote:I suppose that would be consistent with the concept of eternal, or chaotic, inflation (andre linde) which proposes that inflation of a much larger multiverse kick started our universe rather than inflation happening after our particular big bang. It also sounds consistent with some of the things Alan Guth said regarding starting a new universe - need very little matter, but a whole lot of energy and pressure.
Concepts like "Big Crunch" or "Multiverse" are some of the hypotheses I mentioned above. Their problem is that they become increasingly difficult (if not impossible) to test. As far as I know, an open problem with inflation is how to stop it, because if it wouldn't have stopped at just the right moment, matter would be so diluted that no galaxies could have formed.
[quote="bystander"][url=http://www.insidescience.org/inside-science-minds/1-2661][size=120][b][i]Every Black Hole Contains a New Universe[/i][/b][/size][/url]
Inside Science | Nikodem Poplawski | 2012 May 17
[b][i]A physicist presents a solution to present-day cosmic mysteries.[/i][/b]
[/quote]
The headlines of the article reads: "Every Black Hole Contains a New Universe"
The article's first sentence reads: "Our universe [b]may[/b] exist inside a black hole. "(where I emphasized the may)
This is a recent trend that I find more often nowadays. The headline makes exaggerate claims, which the article (and probably the scientists as well) doesn't make. Especially with these kind of statements that are difficult to test, everybody should be very clear on what are actual facts and what are hypothesis.
[quote="grpotmesil"]Okay after watching the lecture and the other posts, I'll go with the concept that the singularity that resulted in our universe was the result of a black hole in another universe. [/quote]
In the framework of general relativity, Penrose, Hawking, and others proved mathematically the existence of a "singularity" at the center of a black hole and in cosmology. Figuratively speaking, the presence of a singularity means that you can reach the "edge of spacetime" in a finite amount of time, and maybe "fall off the edge". These strange findings are taken by many as a sign that general relativity is no longer valid under these extreme conditions. In particular, the quantum nature of matter should also be taken into account. But since no one knows how to do this, the field is open to all kind of hypotheses.
[quote="grpotmesil"]I suppose that would be consistent with the concept of eternal, or chaotic, inflation (andre linde) which proposes that inflation of a much larger multiverse kick started our universe rather than inflation happening [u]after [/u]our particular big bang. It also sounds consistent with some of the things Alan Guth said regarding starting a new universe - need very little matter, but a whole lot of energy and pressure.[/quote]
Concepts like "Big Crunch" or "Multiverse" are some of the hypotheses I mentioned above. Their problem is that they become increasingly difficult (if not impossible) to test. As far as I know, an open problem with inflation is how to stop it, because if it wouldn't have stopped at just the right moment, matter would be so diluted that no galaxies could have formed.