zhangjunphy

12 месяцев назадdiscuss

I think if we can have a good enough simulation of reality, and a fast one. Something like an accelerable minecraft with real world physics. Then this idea might actually work. But the hard reality we currenly could generate efficiently and feed into LLMs usually has a narrow scope. It feels liking teaching only textbook math to a kid for several years but nothing else. The LLM mostly overoptimize in these very specific fields, but the overall performance might even be worse.

zhangjunphy

12 месяцев назадdiscuss

True, and the successful ones usually require an external source of information. For AlphaGo, it is the simple algorithm which decide who is the winner of a game of Go. For GAN, it is the images labled by human. In these scenarios, the critic is the medium which transforms external information into gradient which optimized the actor, but not the direct source of that information.

zhangjunphy

12 месяцев назадdiscuss

I also hope we have something like this. But sadly, this is not going to work. The reason is this line from the article, which is so much harder that it looks:

> and a critic model filters the results for genuinely valuable ideas.

In fact, people have tryied this idea. And if you use a LLM or anything similar as the critic, the performance of the model actually degrades in this process. As the LLM tries too hard to satisfy the critic, and the critic itself is far from a good reasoner.

So the reason that we don't hear too much about this idea is not that nobody tried it. But that they tried, and it didn't work, and people are reluctant to publish about something which does not work.

zhangjunphy

3 года назадdiscuss

It is a counter argument against that we can build a perfect simulator of our universe, but not a good one against that our universe is simulated.

In fact if I were to build a simulator, I most likely have to design a mechanism to prevent its residents from observing beyond a certain micro scale due to limited cpu/mem resources and laziness to implement all the details. Tiny black hole is a good mechanism to reduce resource consumption when simulating a fixed volume of this universe. Imagine living in the world of Minecraft, the minimal unit is a block. Trying to look inside of it yields nothing. All physically meaningful characteristics are described by its surface. In our universe this looks very much like a blackhole.

zhangjunphy

3 года назадdiscuss

The market has changed drastically since some Chinese factories start mass producing synthetic diamonds around 2019.

Currently in the end market the price is $200~300 for a 1CT synthesized one, and the quality are simply better all around. The only way to distinguish natural ones is to track from the start where each is mined and processed, which is a bit absurd.

Many of these factories were associated with drill head industry and the like until they found the jewelry market is much more profitable and got the trick to mass-produce them. If they are willing to compete a bit the price might even go lower.

zhangjunphy

3 года назадdiscuss

QFT is too successful that experimentalists stuck for half a century with no meaningful surprise. But theoreticians got to maintain a publication streak if trying to stay in academy. Thus string theory becomes the perfect field. Most ones doing it seem to know it is a goose chase but no one dare to admit it publicly as your colleagues stripped of funding would tear you to pieces.

I feel we really should sort these papers into a category "physics in imaginary universe", so other people do not get confused.

zhangjunphy

3 года назадdiscuss

Some additional context here. The author has a further statement, in which he apologizes that the previous video was misleading due to two points: 1. The sample was not LK99. 2. Both the larger piece held by the tweezers and the smaller levitating one were from the same sample. But he also states that no tricks of any kind were used nor the video was edited.

So, some other material levitating itself in seemingly room temperature?

Currently this guy is practically using his real name, with his university and professor exposed. It takes some courage to lie at this point.

link(in Chinese): https://bilibili.com/video/BV1Zh4y1r7XL

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Edit: People sometimes speak in convoluted ways. I feel "The sample was not LK99" could have two interpretations here: 1. It is a completely different compound. 2. It is a derivative from LK99 with a different synthesis/doping method.

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