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40m
comment Cold Solid Matter at the End of a Black Hole's Acceleration Disk?
Maybe I should emphasize, Bose condensation is not fusion, Bose condensation would just be a different way for atoms to get very close. But the atoms have to be the same type, and even then, it only happens for certain types of atom.
49m
comment Cold Solid Matter at the End of a Black Hole's Acceleration Disk?
Bose condensation only happens for specific atoms en.wikipedia.org/wiki/Bose–Einstein_condensate#Isotopes and it's very delicate. Nuclear fusion in an atomic BEC would be even more delicate, if it's even possible.
1h
comment Cold Solid Matter at the End of a Black Hole's Acceleration Disk?
@Jen The first part is sort of what happens when a star forms. The atoms in the protostellar nebula of gas, that is spread across space, all fall towards the center of gravity. That's how they get their kinetic energy. The nebula shrinks to star size and each nucleus then spends millions or billions of years inside, ricocheting from others until they have a head-on collision and fuse.
1h
comment Cold Solid Matter at the End of a Black Hole's Acceleration Disk?
@dmckee I think this is half of a personal theory about emission (of light? of jets?) from near black holes.
1h
answered Cold Solid Matter at the End of a Black Hole's Acceleration Disk?
3h
comment Cold Fusion and Black Holes
@Jen but with your other questions I think I finally get the picture... You want to explain emissions from black holes, as a side effect of magnetically caused cold fusion near the black hole, something like that?
4h
comment Cold Fusion and Black Holes
@Jen that's crackpot material. And it makes no connection between Einstein and cold fusion.
17h
answered Is climate change caused by humans?
2d
comment The naive idea of the big bang
@CuriousOne That's not a reasonable comparison. An explosion in the conventional sense is a type of physical process for which there are models. It is completely reasonable to wonder whether the expanding universe was produced by an explosion. And I have noticed that exposition regarding this issue does not say "why primordial explosion is a physically wrong idea", it says "why big bang theory isn't a primordial explosion theory".
2d
comment Multiverse fictional constraints
Multiverse just means any scenario with more than one universe. Two is more than one, so the "theory" that reality consists of "this universe" plus "Dragonball Z" is a multiverse theory, though not a popular one outside of Dragonball fandom... As for the many-worlds interpretation of QM, that's always relative to some specific theory like "standard model + gravity"... "All logically possible worlds exist" is multiverse maximalism, found e.g. in David Lewis and Max Tegmark, and is far beyond the limited multiverse notions that are employed by some physicists.
2d
comment The naive idea of the big bang
@CuriousOne Sophistication is relative. The minimum I was after is a quantitative model based on laws or principles. The average "naive big bang theorist" is just a layperson thinking intuitively.
2d
asked The naive idea of the big bang
Feb
4
comment Cold Fusion and Black Holes
I don't know what "Einstein's cold fusion" is, cold fusion saga was long after his time, do you mean Bose condensation??
Feb
4
comment Cold Fusion and Black Holes
As for the black hole, maybe there could be some sort of magnetically driven en.m.wikipedia.org/wiki/Evaporative_cooling_(atomic_physics) in its accretion disk, under the right conditions, I don't know
Feb
4
comment Cold Fusion and Black Holes
en.wikipedia.org/wiki/… seems to show that the effect involves the microscopic magnetic domains inside a magnet becoming more aligned and then less aligned, in a cycle driven by external magnetic field that goes from strong to weak and back again. And in the stages of this cycle, the magnetic domains absorb or radiate energy, changing the overall temperature
Feb
4
comment Cold Fusion and Black Holes
I never heard of magnetic refrigeration before, but according to the Swedish link, it works because a magnetic field causes some substances to grow hotter. So you heat them with a strong field, then you make the field weaker, the magnetocaloric substance gets cooler, and so if it was touching some other substance, the other substance would get cooler too.
Feb
3
comment Can Loop Quantum Gravity and Quantum Field Theory coexist?
@John Rennie It is highly meaningful to ask about the relationship between LQG and QFT. LQG research isn't just about pure gravity, it does encompass gravity coupled to other fields. Moreover, the whole debate for and against LQG, is arguably about its relationship to QFT. So this is a completely valid question, whether or not anyone here can produce a correct answer.
Feb
3
answered publication ethics
Feb
2
comment Big Bang Quarks Travelling at Light Speed
@dmckee the source is right at the end, "pela"
Feb
1
comment Can Quantum Field Theory be right even though it doesn't include gravity?
otherwise, I would say that as a quantum theory of gravity, string theory is in much better shape than AS or LQG. In string theory, gravity comes automatically with fermions and gauge bosons; and in principle, the geometry and topology of the extra dimensions actually determines all the particle masses, couplings, etc. So it is quite compelling. But in practice there are a zillion possibilities and it's very hard to calculate anything. There is progress, there are partial successes, but there is so far no "standard stringy vacuum" in the way that QFT produced a "standard model".