Physics

Shouldn't the slopped distance be considered instead of the height?

(Sayonara Zetsubou Sensei: chapter 233)

A Micro-Comb is when Jeffrey Combs only plays that character for one episode.

Optical frequency combs are laser sources whose colors are evenly spaced, like the teeth of a comb. They underpin many modern technologies requiring precision measurement, from atomic clocks to high-speed telecommunications. A landmark invention in optics and the subject of the 2005 Nobel Prize in Physics, conventional fiber-laser frequency combs are stable and reliable but can be limited by bulk and expense.

The Lončar lab is at the forefront of creating chip-scale optical frequency combs, or microcombs, by shrinking these laser sources to micron-sized photonic circuits. These microcombs offer many advantages, including requiring less power and having larger comb-line spacings suited for carrying high-bandwidth data.

It's not guaranteed that the FCC will be built yet. But if CERN decides to build it, then these people will chip in 860M EUR.

The people in question are "a group of friends of CERN, including the Breakthrough Prize Foundation, The Eric and Wendy Schmidt Fund for Strategic Innovation, and the entrepreneurs John Elkann and Xavier Niel".

cross-posted from: https://lemmy.world/post/42268908

cross-posted from: https://startrek.website/post/33870342

What happens as a raindrop impacts bare soil has been fairly well-studied, but what happens to raindrops afterward is poorly understood. We know that the initial splash of raindrops on soil contributes to erosion, but a new study, published in the Proceedings of the National Academy of Sciences, finds that the journey of the raindrop downhill might have an even bigger impact on erosion than the initial splash.

So, I was reading about the Unruh effect. In short, if I understood correctly, it is about a constantly accelerating observer finding particles in vacuum that an inertial (non-accelerating) observer wouldn't, and relatedly, measuring a higher temperature there than an inertial observer would. This is due to a combination of quantum and relativistic phenomena. There even seems to be recent empirical support for this, but as I was reading about it, I accidentally stepped into some pseudoscience, which left me in an emotional state where I find everything suspicious.

Anyway, even though I technically am a physicist, this is far from my area of expertise. I came up with a thought experiment and would like to ask a couple of questions related to it.

Let's imagine a spacecraft that does a little trip where it goes into open space accelerating enormously, then stops and comes back. My first question is this: would it be (theoretically) possible for the spacecraft during the acceleration to capture some of those particles that from an inertial perspective don't even seem to exist, store them and bring them back as a very concrete evidence of the Unruh effect? If not, why not?

Another question or two: is my intuition correct when I think that if those collected particles were converted into energy, it would in no situation be possible to gather more energy this way than would be spent in the process of accelerating the spacecraft etc? If yes, could one in some sense say that the energy put into the acceleration is what created those particles in the first place?