“Trapping electrons in a crystal” is such a nonsensical way of conveying the idea of a flat band. Most isolated crystals trap all the electrons they have inside of them, or else the world will be full of free roaming electrons!

current carrying wire of finite length

Well I suppose a cheesy way of putting this is that there is no such thing as a “current carrying wire of finite length”, by itself.

To expand, just because one can calculate the contribution to the magnetic field at some spatial point from such an object, doesn’t mean it is the sole source of the field in a theoretically consistent manner. If you complete the “loop” with two semi-infinite horizontal wires, and another vertical wire at infinity (assuming it has an emf there to power the circuit), then the field will change due to the two horizontal wires. This construction however breaks rotational symmetry around the original wire (so you’ll not be able to compute the loop integral simply as B times circumference), and in order to restore that, instead of just two horizontal wires, you’ll have to have infinite such pairs in all radial directions (like a squeezed coaxial cable). Anyway, I guess the point is after “completing the circuit”, the “paradox” will no longer be there.

The Ying Yang is the “shape” of the light source. The point is that their technique can be used to infer the shape of an unknown light source, among other things. In so far as the data being recorded in the experiment involves two photons (or really, many identically prepared copies of two photons over time) and therefore 4 spatial dimensions (x y for each), then yes the 2d image they show is necessarily “interpreted” from the 4d “raw image”. Exposure time is 1min according to the paper, so not quite “real time”, but the whole theory is time independent (no time in any equation), so I imagine it can be shortened with e.g. higher laser power.

caveat: not an optics person so grain of salt…

The bigger black and white on the left is the “double exposure” of both the reference state and the unknown state and is observed. But the Yin Yang you see is the shape of the pump beam, which is the smaller black and white inset on the left. The colored one on the right is the reconstructed unknown state (that is, it is computed from b&w one and the reference state (not shown))

Well the band wagon has turned 180, now it’s fashionable to point out the flaws. My issue with this kind of videos is really, where are you in the early days of the hype, when the public needed cautions the most? A convenient naysayer when all the actual hard works have been done elsewhere

Appreciate the uplifting spirit, but not sure who this list is for. Physics undergrad? Talk to a professor. In grad school? Probably already has some personal taste and knows how to pick books that best suit one’s own style and need (plus talk to your peer/professor). Budding enthusiast? Pick a topic of interest and go from there – life is short, no need to waste time on every standard text book.

Also, quite a negligence not mentioning a single book from Landau & Lifshitz.

To be fair, time crystal is a real – albeit somewhat clickbaity – concept in physics, proposed by none other than the Nobel laureate Wilczek. In simple terms, a time crystal is something whose frequency is not a harmonic of what’s driving it (e.g., its periodicity could be double that of the drive). It’s a “crystal” because it’s breaking the (temporal) symmetry of the governing theory, just as a conventional crystal, by forming into a lattice of atoms, breaks spatial translation symmetry.

Documentation is different from demonstration. Text (with graph or animation interspersed to unpack unintuitive terms) wins for documentation. Video could be good for demo if presented in a no-nonsense manner.

Scale of velocity as well so we have a more complete picture in phase space

The referees who let this slip are either brilliant or lazy (or both, I guess)

You guys do know the affordability of the chips you’re using to comment on this is a direct consequence of TSMC “efficiency”, right?

Mind you, the DFT calculation from the Griffin paper is not a proof of LK 99 being a superconductor in any way. What it showed is the (potential) formation of flat bands near the Fermi surface. Band dispersion is associated with the kinetic energy of the electrons, so materials with flat band (and therefore electrons with suppressed kinetic energy) at the Fermi surface are more susceptible to interaction effect (and strong interaction causes all sorts of nonintuitive quantum effects). I’m not a DFT expert in any sense, but from what I’ve heard, it is quite easy to “tune” your model to produce narrow (the limit of which being flat) bands from substitutions (e.g. the Cu substitution in this case) and such, which don’t necessarily lead to superconductivity.

So I’ll take the DFT papers (there are quite a few now) as saying, “hey you want some flat band? Here’s some. We’ve done our part. Now some other theorist, do your magic and conjure up some superconductivity”. It’s a cog in the full picture, if there is a full picture

Step 1: “Explains” relativity with Doppler effect

Step 2: proceeds to complain others confusing relativity with Doppler effect

Resubmitting to multiple journals is not a typical (nor the “right” one however it is interpreted) strategy though (at least not in physical sciences). You’ll usually ping the handling editor, who will then contact the referee on your behalf. The referee will then either “promise a report soon”, or, in the event they didn’t reply, the editor will find another referee. Nowadays with arxiv and such, there is usually no rush to actual publication as far as priority is concerned.

I’d also say, don’t take the combative mindset as suggested in the comic. Think of it more as having some fresh pairs of eyes to check your work as well as communication (if a referee misunderstood something in your paper, chances are many readers will as well).

What other fields?

Getting it to make a sound is (probably) easy but realistically emulating piano action would be really hard. Reputable electronic pianos all mimic real piano mechanics to a degree, e.g., the visible portion of an individual key is only a fraction of its entire length in order to give you the “weight” and “speed” of the real key action, which would be hard to reproduce with e.g. a shorter key + spring. A search of “hammer actions” should give you some idea

Think of this as a citation gold rush. You need to get on the band wagon early to become part of “the standard references” that everyone has to cite regardless of relevance. People will avoid making outlandish claims in order not to look stupid a year later in case things didn’t work out – no follow up work thus far has actually claimed to see superconductivity, just innuendos.

Not saying LK99 is or is not the wonder material, but right now it’s more of a sociological experiment.

Give me a way to physically shut off the microphone (like a camera shield on business laptops), then we will talk.

Strange topics had popped up in my Google feed after l spoke to someone about something I’ve never googled before

Creator already exceeded 100wpm and said it works equally well for random strings iirc.

Not quite sure how to think about the ergonomics though. This is different from steno as each chord only produces one letter, so on average there are nominally more keystrokes than letters produced. Exclusive chording probably also don’t work too well with keywells etc with uneven key heights. Would be interesting to know long term effect regarding comfort/stress

Hahaha, but to be fair, high Tc now typically refers to above the nitrogen boiling point of 77K, so 20K is a bit low even for them. I think the reference to 20K is in distinguishing between conventional vs unconventional superconductors–depending on if they can be explained by the BCS theory. When unconventional superconductor was first discovered, the highest known Tc for the conventional ones was about 20K. One could even say, therefore, calling it “high” is just experimentalists flexing to theorists.

I think it’s more nuanced though. It’s more like theory helps us understand the underlying mechanisms of many phenomena, but the lack of precise measurements for initial conditions, together with the existence of chaos, makes robust long-term predictions out of reach.

I mean this idea is not new – Poincare had similar opinions in the 19th century iirc. The only thing the author said differently is that the universe is like an animal, and only in the last paragraph offhandedly for that matter.