Editing Talk:2035: Dark Matter Candidates
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: The theoretical lower limit for black hole mass is the planck mass (22 µg), although such micro black holes would evaporate very quickly under standard models. However, larger black holes were excluded fairly early by gravitational lensing searches ('buzzkill' cases), so smaller black holes had to be considered separately as dark matter candidates. --[[User:Quantum7|Quantum7]] ([[User talk:Quantum7|talk]]) 20:40, 20 August 2018 (UTC) | : The theoretical lower limit for black hole mass is the planck mass (22 µg), although such micro black holes would evaporate very quickly under standard models. However, larger black holes were excluded fairly early by gravitational lensing searches ('buzzkill' cases), so smaller black holes had to be considered separately as dark matter candidates. --[[User:Quantum7|Quantum7]] ([[User talk:Quantum7|talk]]) 20:40, 20 August 2018 (UTC) | ||
::You misunderstand my point: Those not discovered smaller black holes would need an explanation how they did form but more important here how they could be ruled out as Randall states. A nano black hole at 10<sup>10</sup> kg disproved by gamma rays? What's Randall's point? He was more accurate in the past. --[[User:Dgbrt|Dgbrt]] ([[User talk:Dgbrt|talk]]) 22:18, 20 August 2018 (UTC) | ::You misunderstand my point: Those not discovered smaller black holes would need an explanation how they did form but more important here how they could be ruled out as Randall states. A nano black hole at 10<sup>10</sup> kg disproved by gamma rays? What's Randall's point? He was more accurate in the past. --[[User:Dgbrt|Dgbrt]] ([[User talk:Dgbrt|talk]]) 22:18, 20 August 2018 (UTC) | ||
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:I'm with you but this comic is about that "substance" like most astronomers are. This always reminds me to aether - also a famous "substance" in space more than hundred years ago which nobody could explain. --[[User:Dgbrt|Dgbrt]] ([[User talk:Dgbrt|talk]]) 22:32, 20 August 2018 (UTC) | :I'm with you but this comic is about that "substance" like most astronomers are. This always reminds me to aether - also a famous "substance" in space more than hundred years ago which nobody could explain. --[[User:Dgbrt|Dgbrt]] ([[User talk:Dgbrt|talk]]) 22:32, 20 August 2018 (UTC) | ||
::Thanks for the laugh - my thoughts exactly! In fact, part of me wonders if Randall is actually making fun of the whole idea that there's a dark matter particle at all, since there's such a wide range of possible sizes for such a particle. His humor can be so subtle at times that someone may not realize when they're actually the butt of his joke. [[User:Ianrbibtitlht|Ianrbibtitlht]] ([[User talk:Ianrbibtitlht|talk]]) 23:55, 20 August 2018 (UTC) | ::Thanks for the laugh - my thoughts exactly! In fact, part of me wonders if Randall is actually making fun of the whole idea that there's a dark matter particle at all, since there's such a wide range of possible sizes for such a particle. His humor can be so subtle at times that someone may not realize when they're actually the butt of his joke. [[User:Ianrbibtitlht|Ianrbibtitlht]] ([[User talk:Ianrbibtitlht|talk]]) 23:55, 20 August 2018 (UTC) | ||
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Furthermore, while space cowboys were mentioned earlier in the discussion, I suspect Randall included space cows in the chart specifically as a reference to the movie Space Cowboys. Also, I think the point about Neutron Star Data ruling out black holes in that mass range is because you can't have both of them with the same mass, since the current theory is that they both form from a star collapse, but at different masses. You're always going to get one or the other from that size star, and since we find neutron stars in that range, we can't have black holes there too. [[User:Ianrbibtitlht|Ianrbibtitlht]] ([[User talk:Ianrbibtitlht|talk]]) 21:59, 20 August 2018 (UTC) | Furthermore, while space cowboys were mentioned earlier in the discussion, I suspect Randall included space cows in the chart specifically as a reference to the movie Space Cowboys. Also, I think the point about Neutron Star Data ruling out black holes in that mass range is because you can't have both of them with the same mass, since the current theory is that they both form from a star collapse, but at different masses. You're always going to get one or the other from that size star, and since we find neutron stars in that range, we can't have black holes there too. [[User:Ianrbibtitlht|Ianrbibtitlht]] ([[User talk:Ianrbibtitlht|talk]]) 21:59, 20 August 2018 (UTC) | ||
:The mass of neutron stars is well understood. A smaller star ends at a white dwarf and the big ones produce a black hole. Nonetheless our sun will end up into a white dwarf and the others require higher masses as in the buzzkill range at the graph. --[[User:Dgbrt|Dgbrt]] ([[User talk:Dgbrt|talk]]) 22:32, 20 August 2018 (UTC) | :The mass of neutron stars is well understood. A smaller star ends at a white dwarf and the big ones produce a black hole. Nonetheless our sun will end up into a white dwarf and the others require higher masses as in the buzzkill range at the graph. --[[User:Dgbrt|Dgbrt]] ([[User talk:Dgbrt|talk]]) 22:32, 20 August 2018 (UTC) | ||
::My point exactly - we now know quite a bit about the mass needed and process required to form a neutron star, making it unlikely the same mass would be able to form a black hole. I think that's what Randall meant in that part of the chart, but that's not what the explanation states. (Unfortunately, I've reached the point where I no longer want to argue with other editors over correct explanations.) [[User:Ianrbibtitlht|Ianrbibtitlht]] ([[User talk:Ianrbibtitlht|talk]]) 23:55, 20 August 2018 (UTC) | ::My point exactly - we now know quite a bit about the mass needed and process required to form a neutron star, making it unlikely the same mass would be able to form a black hole. I think that's what Randall meant in that part of the chart, but that's not what the explanation states. (Unfortunately, I've reached the point where I no longer want to argue with other editors over correct explanations.) [[User:Ianrbibtitlht|Ianrbibtitlht]] ([[User talk:Ianrbibtitlht|talk]]) 23:55, 20 August 2018 (UTC) | ||
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Sorry to be picky, but I'm having trouble with "a star which was nearly in line with the sun appeared closer to the sun than usual." Doesn't a distant star's apparent position move away from the sun compared to the direct path? The light ray we see has been bent toward us, so it appears further away than an unaffected ray would, no?[[Special:Contributions/162.158.74.105|162.158.74.105]] 03:31, 21 August 2018 (UTC) | Sorry to be picky, but I'm having trouble with "a star which was nearly in line with the sun appeared closer to the sun than usual." Doesn't a distant star's apparent position move away from the sun compared to the direct path? The light ray we see has been bent toward us, so it appears further away than an unaffected ray would, no?[[Special:Contributions/162.158.74.105|162.158.74.105]] 03:31, 21 August 2018 (UTC) | ||
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