10 ms·
It's hard to imagine how this could be faked short of digital manipulation, and it seems implausible that it would be a known high TC superconductor because it
by semajian 3y ago
It's hard to imagine how this could be faked short of digital manipulation, and it seems implausible that it would be a known high TC superconductor because it would warm up too fast. Absent the former explantation, I'm starting to believe this is real. Also, it's not like all the author's are unknown hacks. Hyun Tak Kim has about 10k citations (Google scholar, which sometimes combines people who have the same name though) and authored a paper in scientific reports which got L&K interested in collaborating with him. The guy seems to know superconductivity so I'm feeling rather optimistic about this.
- stavros 3y ago> It's hard to imagine how this could be faked short of digital manipulation So, it's easy to imagine how this could be faked.
- semajian 3y agoWell, yes
- stavros 3y agoI'm holding a small basket until one of the reputable labs reproduces this. Anonymous videos on Twitter are a bit too anonymous for me.
- marcosdumay 3y agoI guess the point is, it can be a fabrication, it can be something very important, and it can't really be anything in between.
- ncr100 3y agoAlternatively, https://en.wikipedia.org/wiki/Pyrolytic_carbon https://en.wikipedia.org/wiki/Pyrolytic_carbon is discussed in the Twitter thread by the OP as a possible explanation of "not superconductivity" . . .
- cthalupa 3y agoNot an expert, but my understanding is that magnet configuration could not create a stable levitation for pyrolytic graphite - you need an array of magnets, e.g. https://arxiv.org/ftp/arxiv/papers/1010/1010.5761.pdf https://arxiv.org/ftp/arxiv/papers/1010/1010.5761.pdf Doing a quick sanity check on youtube videos, every example I can find of it levitating involves use of magnet arrays as well.
- ynniv 3y agoIt can easily be faked, using a technique that would destroy the poster's career. It's one thing to not do something to the letter, and another to commit blatant fraud. Most career academics would not burn their career for the lulz.
- stavros 3y agoIt's an anonymous video.
- throwawaymaths 3y agoI think it would be tough for a lay scientist to go from 0 media expertise to faking it this quickly.
- Qem 3y ago> Hyun Tak Kim has about 10k citations (Google scholar, which sometimes combines people who have the same name though) and authored a paper in scientific reports which got L&K interested in collaborating with him. It appears he was a latecomer to the project, mostly borrowing his reputation to the trio of anonymous, non anglosphere native original authors.
- light_hue_1 3y agoLet's be less cynical. Nothing to do with borrowing reputation. The original authors have something. They don't have the expertise in condensed matter physics to really know what. They don't know how to report results and what results would be conclusive. Their work is simply not convincing, and if they were experts they would also not be convinced. That's why they brought in another collaborator who is an expert. But because the paper was released early it's clearly a mess. You can see the big quality improvement though just between the two drafts.
- throwawaymaths 3y ago> Nothing to do with borrowing reputation. It's a pretty common practice across science.
- Qem 3y agoIt's not cynism. The disagreement about authorship apparently was motivated by someone in the original team being pushed aside to open a slot for the well connected "10k citations" guy. It's a old problem academia still fails to address. See: https://journals.plos.org/plosbiology/article?id=10.1371/journal.pbio.3002184 https://journals.plos.org/plosbiology/article?id=10.1371/jou... https://en.m.wikipedia.org/wiki/Neo-colonial_science https://en.m.wikipedia.org/wiki/Neo-colonial_science
- Facemelters 3y agoNo one knows if this version of events is true
- pera 3y agoSeriously? To me this looks like a chip of graphite glued to an invisible thread. The way the object moves is not what I would expect from magnetism (see second 10 for instance)
- mcpackieh 3y agoHow can it look like something that is ostensibly invisible? It's not swinging around like a pendulum, so what exactly are you seeing that makes you think it looks like an invisible string?
- pera 3y agoThe thread is horizontally positioned, left to right, not vertically.
- gabesullice 3y agoFinding a thread that small would be a feat of its own. I wonder if your eyes might be getting tricked by the watermark?
- mcpackieh 3y agoBut you haven't explained how it looks like that. It could be that, but it looks like it's floating. What is it about the appearance of this thing which has you believing there is a string?
- incrudible 3y agoIf there is a magician on the stage, you can safely presume there is no actual magic involved, even though you do not know how exactly the trick works. For actual flux pinning, the first thing you would do is show what happens if you put the thing upside down. It should stick. Even if it does not, you would show that it does not.
- mcpackieh 3y ago
- thecopy 3y agoAccording to this video: https://twitter.com/xmal/status/1300754522218913799 https://twitter.com/xmal/status/1300754522218913799 it is possible to have stable levitation using a copper plate below the magnet. OP's video has two stacked metal objects – could the lower one possibly contain copper?
- yorwba 3y agoThat one is clearly rotating. Magnetic levitation with a rotating field is not too difficult (you can get levitating flower pots as cheap novelty toys) but the sample in the new video appears fully static. Edit: relevant Wikipedia: https://en.wikipedia.org/wiki/Spin-stabilized_magnetic_levitation https://en.wikipedia.org/wiki/Spin-stabilized_magnetic_levit...
- nyanpasu64 3y agoThe video in the reply (https://twitter.com/xmal/status/1300794329347260417 https://twitter.com/xmal/status/1300794329347260417) seems to show levitation even when the magnet isn't rotating?
- jacquesm 3y agoThey're stacked to increase the field density.
- raziel2701 3y agoThe object that is rotating is a magnet. It's not what we're seeing with the flake which appears to be flux pinned. If this is fake, it's a very well-done fake. I'm feeling 60% sure that LK-99 is RT superconductor at this point. It has theoretical support now since last weekend.
- kzrdude 3y agoMost flux pinning examples on youtube allow rotation (With round superconductors and magnets, though.)
- totetsu 3y agoThe flake is a magnet, and a known type two liquid nitrogen cooled superconductor is inside the blocks at the bottom?