Sunday, December 11

Geek

Daily News Stuff 11 December 2022

Don't Touch Anything Edition

Top Story



Tech News

  • Breaking up with JavaScript front ends, or, how not to communicate anything, painfully.  (Triskweline)

    A PowerPoint presentation in web form that leads to a demo app that doesn't demo anything like what the slides say it does - particularly when the same demo app is linked from two slides supposedly demonstrating entirely different things - rather muddies a fundamentally sound point that JavaScript front ends are dogshit.


  • Twitter Blue is relaunching tomorrow.  (WCCFTech)

    $8 per month via the web.  $11 per month if you're stupid enough to sign up in the iOS app.

    I'll sign up.  Not because I want to be verified (I don't) or want the clout (I don't), but because it's worth it just to annoy all the right people.


  • Fractal Design goes Danish modern.  (Guru3d)

    In black or white, with a choice of mesh or tempered glass side panels, and walnut or oak front panels.

    It actually doesn't look terrible.


  • What's going on in Alzheimer's research.  (Quanta)

    A long article examining the situation as scientists move away from the amyloid plaque model that seems now to have been overstated at best - and outright fraudulent at worst - after frittering away twenty years and two billion dollars.


  • Where - and what - is dark matter?  (Big Think)

    Dark matter is what you get when you map out the visible matter of galaxies and compare it with the total mass based on how fast the galaxies rotate.  We can't see dark matter - it's dark - but we know there's something there because what we can see doesn't add up to enough mass to stop galaxies from flying apart.

    This article examines the possibility that dark matter is truly dark, that it only interacts via gravity.  If this is true, then we have no other way to measure it.

    At least with neutrinos (which only interact via the weak force) we have a convenient local source running 24/7 (that shiny yellow thing you see in the sky now and then) and the little buggers hit our detectors buried at the bottom of salt mines so that we can learn something about them.

    In the "nightmare scenario" considered here (physicists mostly have nightmares about grant applications, but this is one of the exceptions) no particle collision experiment - whether the naturally occurring variety using the Sun as a convenient lab partner or the artificial variety using Switzerland - will ever provide any information about the nature of dark matter.


Pixy Is Watching

Bocchi the Rock.  Imagine K-On! only Yui has crippling social anxiety and...  No, that's about it.  If you liked K-On! there's a good chance you'll like this as well.  Not that it's a direct rip-off, but there's only so many ways "four high school girls form a band" can go.

Well, this is anime, so that's not entirely true.  By episode three they could be fighting alien space bats on the Moon in a parallel dimension using the power of chord progressions, but just this once they're not.



Disclaimer: I think it's missing socks, but my Superconducting Sock Collider proposal has been on hold for over five years waiting for, and I quote, "Joe from accounting to stop laughing".

Posted by: Pixy Misa at 06:23 PM | Comments (6) | Add Comment | Trackbacks (Suck)
Post contains 668 words, total size 6 kb.

1 Okay, they are talking estimated rotation /rates/.  They are looking at the frequency content of the rotation estimate.

For, what, eighty years of information?  I would be a little surprised to discover that galactic 'rotations' are on the order of decades. 

Has anyone looked into the nyquist calcs in regard to the sampling? 

My previous main hypothesis for dark matter was that there was a numerical error.  With a secondary or tertiary suspicion of wrong assumptions buried somewhere, like physics being more local than we expect.

I think my current main hypothesis is aliased rotation rates. 

Posted by: Pat Buckman at Monday, December 12 2022 03:31 AM (r9O5h)

2 Also, a galaxy is not a rigid body.

If you had a simple modeling error wrt to the galaxy's internal motion of stars, you could easily routinely get all sorts of angular rate estimate issues.

Our gravity model, or at least the tractable version, is a two body equation.  

We could easily have some subtle error in how we try to do the aggregation. 

You have a bunch of bodies, you have their general motion trend, you have periodic spatial vibrations from that trend, and whatever situation of stability keeps it from drifting apart.  Presuming that they don't simply drift apart.  And, what about suns that optically cancel each other out from certain angles?

(We presume that space between galaxies is empty, but how empty?  We don't collect enough light to see anythign, but that simply means a low concentration of suns, not absolutely zero suns.)

Surely, these have been looked into some.  But, I can doubt that the silos of physics have been sorted through properly by someone competent to sort through them properly.  The general case of academia is of one that maybe has been sorted through by someone competent, but they have not been allowed to officially publish statements about how much of it is probably junk.  Physics is more specialized than academia in general, so there is more possibility that it may have been so sorted. 

Posted by: Pat Buckman at Monday, December 12 2022 03:45 AM (r9O5h)

3 If your galazy seems a little heavy, maybe check to see if Michael Moore has been visiting.

Posted by: normal at Monday, December 12 2022 04:51 AM (obo9H)

4 In re rotation - there's also the case of rampant egos that would not want anything that competes with their pet theory to see the light of day.  Imagine the money and prestige they could lose.

Posted by: Frank at Monday, December 12 2022 06:41 AM (rglbH)

5 Huh.  Preview function is broken.  Need to fix that.

Posted by: Pixy Misa at Monday, December 12 2022 11:30 AM (PiXy!)

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Apple pies are delicious. But never mind apple pies. What colour is a green orange?




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