Ancient Christian bling

This ring looks like it would have been expensive:

Quantum needs imaginary numbers

I hadn't realised this was a contentious issue before:

Imaginary numbers are what you get when you take the square root of a negative number, and they have long been used in the most important equations of quantum mechanics, the branch of physics that describes the world of the very small. When you add imaginary numbers and real numbers, the two form complex numbers, which enable physicists to write out quantum equations in simple terms. But whether quantum theory needs these mathematical chimeras or just uses them as convenient shortcuts has long been controversial. 

In fact, even the founders of quantum mechanics themselves thought that the implications of having complex numbers in their equations was disquieting. In a letter to his friend Hendrik Lorentz, physicist Erwin Schrödinger — the first person to introduce complex numbers into quantum theory, with his quantum wave function (ψ) — wrote, "What is unpleasant here, and indeed directly to be objected to, is the use of complex numbers. Ψ is surely fundamentally a real function."

Schrödinger did find ways to express his equation with only real numbers alongside an additional set of rules for how to use the equation, and later physicists have done the same with other parts of quantum theory. But in the absence of hard experimental evidence to rule upon the predictions of these "all real" equations, a question has lingered: Are imaginary numbers an optional simplification, or does trying to work without them rob quantum theory of its ability to describe reality?

Now, two studies, published Dec. 15 in the journals Nature and Physical Review Letters, have proved Schrödinger wrong. By a relatively simple experiment, they show that if quantum mechanics is correct, imaginary numbers are a necessary part of the mathematics of our universe.

 

 

A simple problem with Covid

I've been meaning to note that I read a thread on Twitter recently, perhaps from an overseas doctor, which made the somewhat under-appreciated point that a big problem COVID presents, especially with the wildly transmissible Omicron, for hospital managers is the lengthy period positive testing staff have to be away from work.  Hence, even with modest increases in actual COVID patients in a hospital, it may still be really suffering from inadequate staff for all of their patients.

Certified

I've mentioned before the frenetic Twitter commentator Richard Hanania, who got recommended by a couple of well known internet intellectuals and seems to have thereby picked up a heap of followers.

But, seriously, the guy is a certifiable creepy libertarian sociopath, if you ask me.  And look, it might be a cheap shot, but he has a face that would fit so well with being a Batman villain - he's got a Joker vibe going even without makeup.

The latest evidence:

This take completely ignores that Right Wing media (Fox News particularly) has combined undying support of Trump with vaccine/Covid scepticism for a year or more now.   There is no reason to think they are going to start believing Trump on this issue - they are going to put it down to "something Donald likes to bullshit about, but we like him anyway."  They know they still have "and just like that, Covid will go away" Trump from 2 years ago.

Worse:  

He is, like so many at Catallaxy, sure that there is a masculinity crisis ruining the world.   It's a view often held by incels, of which it would hardly be surprising Richard is a member.  There is also considerable irony in him calling others "twitter dorks".

 

Yeah, just being a smug jerk. 

OK, so this doctor's recommendation sounds over the top and ripe for ridicule.  Problem is, Richard's reaction sounds like he wants to blow up her apartment and practice and would think he is doing the world a good.

Sociopath who thinks we understand Omicron enough to know it's safe to spread.  We do not.   In a month or two, we will know how dangerous it is.  But it's foolish in the extreme to be like him.

 

He doesn't have to manage hospitals and health systems - so all good!   Richard's happy that people want to avoid him - a very reasonable reaction, given he doesn't care if he gives someone else a disease that might kill them.   

Comment that made me laugh:

Japanese content

First, France 24, of all channels, has a short but good report on the decline of the Yakuza in Japan:

 

And secondly, quite a charming short video by young Japanese guy Shunchan, in which he surprises his grandparents with a visit after quitting his salaryman job. (He's not your typical Japanese!) My daughter keeps saying "is he gay?" based on his often somewhat Korean boy band-ish fashion sense, but he has clearly indicated in previous videos that he isn't.  I always feel a bit sorry for him, as a guy who can't really work out what he wants to do in his life, but he has a very likeable Youtube persona. 

This isn't very Christmassy, but: an exorcism co-incidence

Well isn't that odd - American funny man (I don't really know what his main job is) "JonTron" finally put out another video, and it's a review of a fairly recent (and terribly, terribly amateurish and unconvincing) documentary by the original director of The Exorcist, William Friedkin, about a real life exorcism in Rome.   The guy swears a bit, but he's pretty funny:

 

And then, today, I see this article in The Guardian, which seems just a co-incidence: 

Boy whose case inspired The Exorcist is named by US magazine 

The article gives some details of the case, which dates back to 1949.   If they are correct (a big "if"), and comparing it to the Rome in Friedkin's flaky documentary, it would indicate that demonic possessions is not what it used to be.

Long time readers would know I am not totally averse to "woo"; I think I even count as more than merely "woo curious".   But I've never been all that sold on demonic possession.  And, as it happens, I've only ever seen little bits of The Exorcist, and feel very confident that it would not be at all unsettling for me.   I think it looks very dated and ludicrous, and find it hard to believe that it did convincingly scare people back in the day.

True, that

 

Why?

I assume from the photo that the article is talking about commercial rent hikes?   If so, why would this be the case?   Companies have just spent 2 years learning they can operate pretty well with half the staff on any one day working from home.  My expectation would be that city commercial renters will only take half the space when they renew, leading to a glut of cheaper space available in the city.

Where is that expectation wrong?

Hossenfelder tries to explain superdeterminism

Well, I knew she would have to be doing this soon, given the recent arXiv paper in which she was a co-author.  Here's Sabine Hossenfelder trying to explain superdeterminism and her expectation that it
solves all quantum oddities:

 

I don't understand the issues fully, but my impression is that Sabine underplays the philosophical significance of it. I wonder what other physicists think.  (To give more detail:  she seems to make an argument that it has no "real" implication at the macro level - but I am not sure that's right...) 

Update:   from comments following the video on Youtube, I pick out a couple that deal with the retro-causality interpretation, which she never mentions:

Before measurement of the particle in the double slit experiment, it is non-localised in time, it literally occupies all possible positions starting when it was emitted up to the point it is observed. This is how a single particle can go through both slits and interfere with itself. After it is observed, it becomes localised in time and acts like a single particle, not a wave. This is why observing before the slits eliminates interference, and does not if you observe afterwards. The crazy part is that the act of observation retroactively affects the past. If you observe before the slit, you do not get interference. If you observe afterwards, you get interference. This is because the wave collapse propagates backwards to the point the particle was emitted. Particles moving forwards and backwards through time acting like a wave, until the point they are observed at which point they never moved forwards and backwards through time in the first place and were always single particles, explains all the 'spookiness' and also explains that the hidden variables are hidden in time and as entities moving linearly through time we will never be able to observe them. Once you get your head around this concept, the weird behaviour of particles in quantum mechanics becomes obvious and logical.

 Mind you, the commenter was "Microdoser", so I'm not sure I should trust him (or her) given my skepticism about that practice.

Another one:

I would add that many physicists assume entaglement can only propagate forward in time. Basic time invariance says that entanglement must be able to propagate backward in time just as well as forward.

And:

So Is Superdeterminism described more by the future affecting the past, or by particles/ wave functions reacting differently depending on what is around them and what they interact with? thank you for the video

Last one:

If the detectors are far apart, and they do influence the measurement, then there is fast-than-light effects happening. (aka "spooky action at a distance"). And maybe this is the misunderstanding in communications with Bell or Zeilinger. As far I understand, they assumed superdeterminism to be a loophole to remove non-locality, in the sense to say the detector isn't actually choosing the angle of measurement, randomly, but is deterministic as well, and the particles kind of "know" this. Bell even got so far as to take a photon from the cosmic background radiation to determine which angle to measure at, which would leave the entanglement of the detector all the way back to the big bang.. and thats what I think they called absurd in "no free will". Thus SD and keeping non-locality, yeah why not. No issue with it, it is supposed to fix non-locality, I really would like to see a backdown how it should work, without making the universe holistic (and thats where I said in effect destryoing non-locality all together). Honestly, I don't have an issue with real faster-than-light effects as long the "cosmic censorship" is somehow in affect that it doesn't allow information communication. So maybe the wave form is physically real (the so called particle is really smeared out) and maybe the collapse is really faster than light. And maybe in case of entangled particles the waves are really connected far apart until collapse. So what. If this is reality, I don't care if Einstein wouldn't consider it beautiful ;)

Another bit of "yeah, but apart from that, what did the Romans ever do for us?"

New research suggests that the Roman prefect Pontius Pilate is the one that built the Biar Aqueduct, the most sophisticated ancient aqueduct of the Jerusalem area. The study also uncovered the way the unique aqueduct was constructed.

The aqueduct is part of the ancient water system serving Jerusalem. Biar, the shortest of the aqueducts, brought water from a point south of Bethlehem to Solomon’s Pools. Other aqueducts carried the water from there to Jerusalem. The five-kilometer aqueduct includes the Biar Spring, an underground shaft tunnel running about three kilometers, a surface channel and dozens of piers used for its construction and maintenance....

Archaeologists exploring Jerusalem have known of the aqueduct for a good 150 years. It has been dated from the Hasmonean period, in the second century B.C.E., through Herod to the late Roman period of the second century C.E. Yechezkel’s team used carbon dating of plaster to suggest that the aqueduct was built in the mid-first century C.E., before the destruction of the Second Temple. They believe Pontius Pilate, the Roman prefect from 26/27 C.E. to 36/37 C.E., known for condemning Jesus to death, ordered its construction.

It's from a Haaretz article, which is quite interesting.

The mug

This is the photo print mug I got made at Kmart last weekend.  Cute, no?

Rats and New York

 The BBC reports on the new (Covid led) trend for outdoor dining in New York city, and its detrimental effects, including more rats than ever before.

The city's ridiculous garbage collection system gets plenty of mention too, but it would seem no one considers that a move to actually using bins with lids is possible.   Surely more rubbish being put out in bins with lids helps limit rat access to it?

This looks good

This movie trailer is getting a lot of positive comment - and I can understand why.  

 

Yes, it's another "multiverse" themed movie, but (no insult to the new Spiderman, I do intend seeing it) it's good to see it being done with fresh new characters.

Real tragedy

Children's deaths in the news are always distressing, but it feels particularly worse in the imagination when it happens while having innocent fun.

The news is going world wide, with the New York Times story indicating that this might be the biggest number of deaths from any "bouncy castle" accident.  Ugh.

A modern tragedy

So a woman in a private hospital room is upset:

Cassie of Sydney says:

December 16, 2021 at 1:54 pm

1. I was double jabbed by October 2021…the AZ vaccine.

2. As demanded by NSW Health and all NSW hospitals, prior to my admittance to hospital on Monday 6 December, on Friday 3 December I had my first Covid test ever. It returned negative.

3. Last Saturday morning, 11 December, before being transferred to another hospital, I had my second Covid test. It returned negative. I was transferred to my new hospital on Sunday morning 12 December.

4. On Tuesday afternoon 14 December, the first hospital rang the second hospital to tell them that I may have been in contact with someone who has tested positive for the Covid Omicron strain. The contact would have happened sometime Saturday afternoon. At about 4.30p.m. on Tuesday 14 December a nurse came in in protective clothing and performed a Covid test on me…..we are still waiting on the result.

5, So, since Tuesday 14 December, at 4.00 p.m. precisely, I have been isolated in my hospital room. I am not allowed to leave, no visitors. Nothing. The nurses and physio come in to the room attired in protective clothing….as though I have Ebola! 

6. We are still waiting on the result of the first Covid test however I have been told that as a matter of security the hospital does a second Covid test, this will be one done tomorrow afternoon and sent off.

7. I will not know any result until at least Sunday….so I am locked in a hospital room until 19 December.

8. I ask genuinely….what was the point of getting jabbed?

9. There is no way…and I mean no way….that I will be having a third, fourth, fifth or sixth jab.

10. Given the above, as you can all imagine my mental health at the moment is not the best, I hope this doesn’t impact my surgical recovery.

11. I am very upset.

Considering that she has more privacy than most get in hospital, food made for her, internet access and help on call, going berserk over a 5 day period of relative isolation strikes me a pretty pathetic plead for victimhood by a woman whose constant angry on line presence I now consider due to a mental weakness.   (She is getting plenty of support from the other tossers at Cathollaxy.)   

Toughen up, dear....

(I can afford to be rude to her, as she has been endlessly rude to me when engaging directly with her on Catallaxy.)