« first day (4670 days earlier)      last day (554 days later) » 

13:00
I mean one could do the Biot-Savart integral, but this is what I want to avoid.
Or what I want to know, if I can avoid it.
Apparently Maxwell's idea for his ether theory was that once he had the EM Lagrangian, that would automatically lead him to a mechanical theory of electromagnetism
since that was one of those assumptions of the era
Just split your Lagrangian into a kinetic and potential term and somewhere there is an equivalent mechanical system
@PM2Ring very coool
Is there anyway of embedding a working clock into the room description?
the idea of having fixed stars in the absolute space is very chilling
newton used to call it the absolute rest frame
From what I remember Aristotle had even more extreme views
Just thinking that time was literally tied to celestial motion
If the stars stopped turning, everything else would stop
13:07
the modern version of this idea is thermal time from Rovelli
it doesnt not make stars the focus. it ties time to motion
Could it be that div(W+grad g) = \Delta g= 0 is what I am searching? That at least would give ma antother constraint.
tbf Rovelli's view would at least be consistent with observations. if nothing moves in space, who is to say that time exists
Newton knew of Galilean symmetry and still believed in the "absolute plane of the heavens and stars"
Aristotle's theory is more badass tho. celestial planets as the in-charge of time
it's like something out of Marvel comics
40 mins ago, by Slereah
Well this was before television
@RaphaelJ.F.Berger sure, that's Gauß law
it's like the time stone from Avengers
13:14
and the last constraint on $B$ is then the Maxwell-Faraday law
Poincaré's "END OF MATTER" chapter is about the ol' theory of electromagnetic mass turns out
as I said: Just Maxwell's equations
The title was click-bait.
I mean it was a pretty wild idea at the time
13:15
@Slereah There was a question with that conception a few days ago on Space.SE
and it is still relevant today since that was basically the origin of mass renormalization
@PM2Ring what's the modern opinion on the idea
Can we destroy time, à la Victory over the Sun
THESUNTHESUNTHESUN
Would "time" exist without light?
Penrose says time gets destroyed in the asymtotic future because only massless particles remain the asymptotic future
Amit told me about this
13:17
Classic story
Penrose ties time to mass-ful particles
Hello hello
Hi pal.
So I take J^B determine my strange W vector potential then I add the gradient of a scalaf function g with div(grad(g))=-div(W) then W+grad(g) = B^{ind}?
Are we praising the sun or something here?
13:18
after having read Poincaré's book, it's time to read... the other Poincaré's book
ugh
does it never end
@Mr.Feynman I was referencing a different video game, but close enough :P
This one was written in 1911 so it may have some wilder ideas
@Slereah yes, as soon as you put an end to it
There's no way out
@ACuriousMind which one?
There is actually a video game that has a pretty wild story of universe destruction somewhat similarly to Victory over the Sun
@Mr.Feynman Sunless Skies, specifically its Clockwork Sun
13:20
The idea of time somehow being caused by the celestial bodies (typically the Sun) is pretty ancient. It's in at least one Hindu cosmology, but I don't know if they originated it, or adopted it from elsewhere.
at some point there's at least a tooltip that's just like "THESUNTHESUNTHESUNTHESUN"
@ACuriousMind would you agree?
I wonder why Newton didnt work on a formula of the electric force
@RaphaelJ.F.Berger I'm a bit confused - how do you determine your $W$?
Long story ...
13:21
I guess it is an idea that makes sense within the context of the era
@ACuriousMind Oh, I didn't know it but I'm not really into RPG
Like, if you handed me your $J^B$ and told me "go find the magnetic field" I'd just plug it into the Maxwell equations
I basically solve some poisson equations.
since it was just about the only regular phenomenon
it seems like Newton did not really understand his theory. if he worked on an electric force, he would not have made the bucket argument
13:22
Except Bloodborne and some DS
@RyderRude Did you actually read any of Newton's books
or any authors of the era
@Slereah no. but ive read the bucket argument. it reveals a misunderstanding of non inertial frames
so first determining a "wrong" magnetic field $W$ and then "fixing" it in a second step to get the actual magnetic field that's a solution to Maxwell's equation sounds like a circuitous route to me - maybe it works, but why didn't you just solve Maxwell's equations in the first place
if Newton had worked on electric forces, he would've known that the bucket was objectively non-inertial. rotation isnt relative
Why is videogames lore so addicting? After I started playing Halo again, I fell into the expanded universe rabbit hole and now I'm here waiting for 10 books full of lore
13:24
instead, he proceeded to say the rotation is relative to an absolute space
he was doing too much metaphysics instead of properly understanding his theory
@Mr.Feynman I was aware this was a very niche reference when I made it, don't worry :P
@Slereah Agreed. But it is a bit disconcerting when someone on a modern science-based site has that mindset.
@Mr.Feynman If you fell into Halo lore I'm willing to blame this on you rather than the sociological forces
@PM2Ring We are little different from our forebears!
13:25
@Slereah which phenomenon?
@Slereah Mhh, it seems you don't like Halo (?)
I'm not a big shooter fan in general
Oh, I'm mostly a fps type guy :P
But beware, that the Halo lore I'm talking about is not in the games
@Slereah True. We mostly just have access to a few more stories and alleged facts. ;)
@Mr.Feynman perhaps you're just addicted to lore as such :P if something triggered it, you'd probably also devour e.g. all the D&D lore even though it's not directly related to video games
13:26
Actually I am doing something very different, which is quite difficult and very lengthy to explain, and now these W fell into my hands and I need to understand how they might be related to B^ind and if and how one can determine the one from the other. Actually I have good access to B^ind but I can use the W for another purpose, which is the actual problem.
If you are interested I try to eaplain it.
@RaphaelJ.F.Berger It's fine - sounds like you know what you're doing ;)
just wanted to make sure you didn't just skip the much easier step of solving the Maxwell equations from the start
not sure about that though :D
Newton was also pushing hard for an absolute rest frame despite literally addressing Galilean transformations in his book
13:30
@ACuriousMind That is possible, I remember having my lore addiction period to Bloodborne too. There must be some element to trigger my interest though. In that case I liked the Lovecraftian touch of the lore, in the case of Halo I like the ancestral feeling about everything coming from some very ancient race once ruling the galaxy which is now extinct
@RyderRude Why would Newton do anything with electricity? All of that stuff came after Newton.
there were works on electricity before Newton
@PM2Ring the existence of the electric force as well as like and unlike charges was known for a thousand years
ie. mister Descartes
Newton could have worked on a formula
instead he just worked on one force and gave three laws for general forces
13:31
He could have worked on many things
why would he work on electricity
a pretty marginal phenomenon back then
electric force is behind everything tho
Anyhow, this "lore period" has been quite anomalous as I haven't been so distant from physics for years. It's been like 4 months since I became less eager
Easy to say now
I am investigating the topology of J^B but its nasty stuff in part, and I stubmlede across what is called toroidal-poloidal ddecomposition of solenoidal vector fields. Which seems as exactly what I need. Now it turned out that this TP decomposition is numerically not as nice as what I require. Then it occured to me that I can achieve almost the same if I split B^ind into its z-component and the x- and y.
that was very much not the idea back then
13:33
Now was thew question since these seem so asimilar if I can obtain the TP directly from B^{ind} without solving Poisson eqs.
what did Newton think macroscopic bodies were held together by
it was well known that it took force to break them
@RyderRude are you really saying that Newton did not understand his own theory because he didn't know electromagnetism, which was fully developed two centuries later? :P
@Mr.Feynman he had some big misconceptions about his theory like absolute space, bucket argument, etc. electric force reveals the misunderstanding in the bucket argument
@Mr.Feynman this is advanced armchair physics: Not only did he not actually read Newton, he also expects Newton to have invented a time machine to acquire a 21st century understanding of physics to then go back and develop his theories based on that
@RyderRude You're doing that thing again. Projecting our modern conceptions onto people who lived before those conceptions existed.
13:36
@PM2Ring i have read that people knew of like and unlike charges for long
people used to get shocked by electric eels
what does some eel shocking me have to do with forces?
that's just how eels work
touch them, get shocked
it was just one of the examples given. the main experiment was like slik rubbed on glass
this experiment was known for a thousand years
so some magic happens when I rub this pole with a cat fur
what's that got to do with forces
it's attraction and repulsion
it's literally what gravity is but twice as more interesting
you're so modern you can't even conceive of how much people back then did not have a unifying scientific framework in which everything had to be explained by the same reductionist physical rules
13:39
@ACuriousMind I bet he will on his NG+ run
Newton was a 17th century dude
He believed in corpuscules and ethers
and maybe actions at a distance, but that was because he was a rebel
Yes, they had some experience with static electricity. (The word "electron" comes from the Greek word for amber). But it was just a curiosity. They had no substantial theories about it, and they certainly didn't suspect its fundamental role in sticking matter together. It was a major breakthrough when they realised that lightning was related to static electricity.
he was an alchemist and magician, for heaven's sake!
there was literally zero perceived contradiction between his physical work and also believing in magic
before the 19th century eels didn't shock you as electromagnetism had not been invented. Things were worse in the 17th century before Newton invented gravity. Imagine being blind and floating
There was some theories of electricity back then but it wasn't considered a particularly fundamental phenomenon
13:41
@Mr.Feynman at least I'm not blind, floating and being shocked by eels!
They just thought electricity was some fluid (because they thought everything was a fluid)
i understand. maybe I am expecting too much of Newton relative to his time
Electricity wasn't that fundamental a phenomenon until they discovered the electron I think
By the way, this kind of thinking is not so different from cancel culture and presentism in history
We remember Newton for his mathematics & physics. But he spent a lot of time investigating alchemy. And he probably spent more time looking for secret patterns and messages encoded in the Bible than on all his mainstream science & mathematics work.
13:43
also that light was an EM field
but it is still correct to say that he did not understand his theory because he believed in the bucket argument and absolute space
he had Galilean transformations
Yes that works now! I have to solve now another poisson equation to determine g but that makes sense for the no-free lunch theorem!
Thank you @ACuriousMind!
@RaphaelJ.F.Berger Yay!
@PM2Ring yes. i've read about that
he believed in the rest frame
it's not a bad thing to not understand your theory. it is to be expected
There are also weird ancient reasons for this
13:46
since someone just flagged that: "yay!" is just supposed to be an expression of joy. Is there something offensive about it I'm missing?
Sorry, my accident. I wanted to star it :(
for e.g. Einstein did not initially understand that the co-ordinates in GR were meaningless
@RyderRude What you consistently fail to appreciate is how much of the basic way in which we look at science and the world today should not be taken for granted. We stand, in every direction, on the shoulders of giants - not only with respect to the amount of "facts" we know, but with respect to the very idea of how such scientific facts are supposed to form a cohesive whole
@Slereah oh fudge what have I done
this is also well-known
13:48
also the very rules upon which science are founded
having to check that things have to work in real life was somehow not that big of a priority for a lot of it
Einstien was confused about GR being deterministic. it was a huge misconception
Most of the "facts" which we use to form our picture of the universe from the small to the big - that stuff is made out of atoms, that the lights in the night sky are stars and that there a millions of galaxies of stars out there in the void and that all that is governed by the same kind of laws - are barely 100 years old
this is not a bad thing. the founders have misconceptions about their theory
the point is that you are justified to have some misconceptions about something that is still being created and would only be clear later
@Mr.Feynman exactly
13:50
to be very concise, you make it sound like "ew, X was trash because he didn't understand his own theory"
plus as I said
The world used to be inscrutable in every aspect and we slowly, steadily unraveled it, and here you go at the end of centuries of hard work and say "idiots, they didn't even understand their own theories"
Newton had very good reasons to believe in absolute space
The reason being that in some sense, space is the body of God
@Mr.Feynman i'm sorry if i come across as that. i only meant to point out what they did not understand about their theory
but they still made up the theory. making the theory is a far bigger achievement
@RyderRude No, it is you who does not understand Newton's theory. When we're "teaching Newton" today, you're not being taught what Newton really thought. You're being taught what useful things we today took away from him.
Go ahead, try reading the principia instead of a modern summary
13:53
not a fun task
I think that's something obvious if we're talking about something as complicated as physics. People don't have to understand all the implications and caveats of something just because they did it, even more so if we're talking about aspects of theories that would be under discussion only at later times
Boy I hope you enjoy geometry
I predict your reaction to be not "this guy doesn't understand his own theory" and more "wtf is this"
Having analytic geometry was cutting edge stuff
@ACuriousMind i had tried to read it years ago. but i dont remember anything
the language sounded quite confused, yes
13:54
confused and confusing are two different things
This is really no different from saying that Romans were not good at war because they didn't use tanks and fighters
Given the usual output of @RyderRude I'm not willing to blame Newton on this one
@ACuriousMind do you disagree that they had a few major misconceptions about their theory
@RyderRude yes
don't get me wrong: the theory isn't "correct" from a modern viewpoint
At the start of the 20th century, mainstream astronomy assumed that the composition of the stars and planets was pretty similar. The stars were just bigger & hotter. It was quite a surprise when it was realised they were mostly hydrogen & helium. Of course, helium itself wasn't formally discovered until 1895. ;) It was first detected in solar spectra in 1868.
13:56
but it's not that Newton had a "misconception about his theory" - that doesn't make any sense
he was just wrong in some respects
doesn't mean he didn't understand his own theory
@RyderRude As I said above
3 mins ago, by Mr. Feynman
I think that's something obvious if we're talking about something as complicated as physics. People don't have to understand all the implications and caveats of something just because they did it, even more so if we're talking about aspects of theories that would be under discussion only at later times
It was also not a particularly unknown point
There were people against the idea of absolute space contemporary to Newton
(and in many other eras really)
absolute and relative space is a pretty old debate
Mhh, it seems Relativisticcucumber hasn't logged here recently
i'm saying the same thing that ACM and MrFeynman are saying. the founders are wrong about a few conceptual things
@Mr.Feynman u say it here
@ACuriousMind u say it here
if that's your only point you're expressing it extremely badly
13:59
And again, as we're telling you that's not something remarkable, I think it's quite obvious and human
and again, this is to be expected, as I've said many times. it is not to call them stupid
@Mr.Feynman aaa i'm literally saying the same thing
please stop disagreeing :)
Agree to disagree.
it is expected that the founders dont completely understand a newly found theory
I haven't disagreed. I only said that I don't think it is something astonishing
What I mean is: why would you point it out in the first place? To what purpose?
to point out what specific things they were wrong about
it is just a piece of history
14:03
@Mr.Feynman Many students mysteriously vanish between semesters and equally mysteriously return when they have stuff to procrastinate again ;)
@ACuriousMind probably out tanning
you can see this pattern in pretty much every activity measure on the site
@ACuriousMind what about on the fun stackexchanges
by "the site" I meant physics.SE, yes, you're right, the "fun" ones are different
SillyGoose and DIRAC have also stopped
14:04
this pattern is mostly for the academic ones
Let's see their activity patterns
@RyderRude If that's it, suit yourself. My first impression was that you were being sensationalist about it (no offence meant)
You're seeing a leaf because SE is stupid but this is a link to the gardening SE
Squaxk
@SillyGoose HONK
14:05
but I think every site has the "weekend dip" - regardless of the topic, many people engage with SE primarily while procrastinating at work
@ACuriousMind Well, I logged to the chat just to complain about myself not being eager of studying for a couple of months now, so... :P
@SillyGoose speak of the devil
Gardening SE seems pretty low traffic, despite the gripping topics
And I also missed the hBar wit
This is the hottest topic this month :
5
Q: Creeping plant taking over the garden

quantum231There is some sort of creeping plant that is coming from behind the shed from another house and spreading into my garden. It is an extreme nuisance. It has spread very fast this summer. Half of the fence on one side is completely covered. Its spreads like a web so it is hard to take it off. What ...

14:07
lol
SE has to be the best site
Full of creeps :P
It's fun to imagine that each SE community has a version of us each. Gardening SE Slereah would be planting exotic carnivorous plants that would end up devouring him
i'm quite active on philosophy too
@Slereah Did they try Agent Orange?
"I've found this 10.000 years old seed, let's see what happens"
14:10
@RyderRude Is that why you're losing interest in physics.
There are only so many hours in a day.
@user726941 philosophy is even worse like i saw. not just taken for granted axioms, but also un-testable ones
ive recently stopped philosophy
@Mr.Feynman Slereah isn't an experimentalist! He'd be reading about carnivorous plants and the historical weirdos who got devoured by them
3
You make a good point
@Loong didn't they use that in Vietnam
14:14
yeah
There is a plant called gympie gympie. it is also called the suicide plant
but unfortunately I have to disappoint you: Most SE sites are much less active than physics.SE, and most SE chats are less active than the h bar
but the naming is a misconception. no one has confirmedly killed themselves after getting bit by this plant
then again, I mostly hear about other chats when flags are being raised, so I might be biased :P
14:15
only MathSE is more active
there is also religion SE and cooking SE. i havnt visited
Stack Overflow's chats are rocking.
Most SE chats tend to be pretty empty except for a few
It can be a bit discouraging
this chat used to be active in 2017 according to history
now many people have left
I know, I was there
Pre-lockdown
14:17
they all died
I didn't.
Even if it sometimes seems like it.
how to make this chat popular
but i dont want it to be flooded with homework
phySE does not promote this chat. there's no link there
This ain't Discord, pal.
not everything needs to be popular
or unpopular
14:20
i mean popular upto pre covid levels
not too popular
it seems like many users left SE
it's not a Covid effect
Monika effect
maybe you could link this chat on the main site
but idk. popular would mean declining quality
it is also goood as it is
AI effect
it's exactly as well-promoted on the main site as meta, and that's intentional
14:23
philosophy chat is completely dead
math one is more active than here
that's exactly proportional to the activity levels of the main sites
but i dont feel like discussing math except for Godel's incompleteness theorem
Discord is the place for philosophy.
you just need to realize that 99.9% of users aren't interested in either meta or chat, they come here to ask questions and get answers and nothing else - this is the main purpose of SE sites, and it is intentional that most users engage with the sites only in that context
@user726941 A real Agora
14:25
god I hate discord servers
not the functionality as such, but that they have effectively replaced what used to be open, searchable forums
@RyderRude This chat is fine
@Mr.Feynman in 2017, there used to be many users
@ACuriousMind I totally agree.
i searched a term and some discussion showed up from 2017
@ACuriousMind What I don't understand about Discord servers is why people use them to chat. Discord is good for voice chat or for a gaming party
14:28
@RyderRude again, chat activity follows site activity; the site was more active in 2017, too
The only reason I can see is capacity
@Mr.Feynman Thing is...what else do you use to chat these days
msn and icq are dead
@ACuriousMind was the site the most active around 2010? answers from that time have hundreds of upvotes
TELEGRAM
all social media chats suck
14:29
I'm a bit of a telegram freak, sorry
@RyderRude can you perhaps think of another reason why older answers might have more upvotes?
YouTube dominates.
one would expect this to happen even if activity stayed constant over time
I don't think it's that hard to figure out :P
@ACuriousMind one other reason was that the site wasnt as active and hence the same questions remained on the home page for months
Twitter is a close second
14:30
this is another hypothesis
@Mr.Feynman perhaps, but that's mostly on people's phones and doesn't feel like a community to most
@RyderRude nope, still not it
@ACuriousMind and yet modern movies are just breaking box office records all the time now!
I repeat: You'd expect older posts to have more upvotes even if activity levels stayed constant
Gone with the Wind isn't top of the charts!
@ACuriousMind another reason is just that over time these questions show up on google searches and people upvote
14:31
@RyderRude ding ding ding
so more time means more visits
just look at the view counts: The most upvoted questions tend to also be the most viewed ones, with certain exceptions
but still, the 2010-2012 stuff has an abnormal number of upvotes. im telling u
Rep points are being rolled back.
@ACuriousMind when did the site peak according to actual stats?
14:32
@RyderRude yes because all the simple questions everyone has hadn't been asked yet so every subsequent asking of those simple questions points to the old one as a duplicate
and so people go upvote the original
it's natural: over time, the questions on SE sites have to become more niche on average because all the low-hanging fruit have been asked
oh
the older questions are very conceptual in nature
@RyderRude not counting the first lockdown peak, in 2017
although on a moving average, I'd say the actual peak is 2021
Ron Maimon's answers are from 2010-12
14:35
@Slereah that's the lockdown spike
many top users have left
there's a giant activity spike in the month where most countries started to lock down
I don't think Maimon left
Qmechanic and annav are still there among the top reputation users
@RyderRude ...you realize that's because he was banned from the entire SE network for more than 100 years after that, yes? :P
14:36
and johnrennie
@ACuriousMind what? why?
@ACuriousMind How many lockdown spikes were there?
can't you read
seriously do people never read profiles
lemme see
if you click on Ron's profile it clearly says he's suspended network-wide until 2292
Question about this. The typical way to go is to note that there is this ambiguity due to the $\phi^\ast\overset{\leftrightarrow}{\partial_0}\phi$ ordering problem and then remove it by postulating the vacuum bears no charge. It turns out this is the same as normal ordering.I wonder what would be the ordering choice to be made on $\phi^\ast\overset{\leftrightarrow}{\partial}_0\phi$ to get it normal ordered directly
14:38
he says he left because of censorship
@user726941 a giant one in Q1 of 2020 and several smaller ones that aren't as clear
Thanks.
@Mr.Feynman what do you mean, "normal ordered directly"?
if you want to "normal order" it "directly", expand everything into modes, then get to sorting
oh yes. the phySE account says suspended
why was he suspended
He has a big personality
14:41
Arrogance
we generally don't discuss suspensions reasons publicly and also I wasn't a mod back then but honestly if you read through his contributions it's not that hard to figure out :P
what
idk. i guessed he said offensive stuff
he is the personification of greed
Mammon in the New Testament of the Bible is commonly thought to mean money, material wealth, or any entity that promises wealth, and is associated with the greedy pursuit of gain. The Gospel of Matthew and the Gospel of Luke both quote Jesus using the word in a phrase often rendered in English as "You cannot serve both God and mammon." In the Middle Ages, it was often personified and sometimes included in the seven princes of Hell. Mammon in Hebrew (ממון) means "money". The word was adopted to modern Hebrew to mean wealth. == Etymology == The word Mammon comes into English from post-classical...
@ACuriousMind i've read many of his answers
The ambiguity arises because $\phi^\ast\partial_0\phi$ may be quantized as $\phi^\dagger\partial_0\phi$ or $(\partial_0\phi)\phi^\dagger$ or the anticommutator etc. Isn't the condition imposed on the charge of vacuum the same as choosing between one of these (or other possible alternatives)?
14:42
they are all focused on physics
@RyderRude hint: he's suspended network-wide, that doesn't happen just because you're a dick on physics.SE
i shud read the rules then
moderators can only suspend users for up to a year; longer suspensions come directly from SE employees
Didn't he post that youtube video about SE
I forget
I won't discuss this further, if you can't figure it out, let sleeping dogs rest
14:46
i guess he aggressively criticized SE on youtube
@Slereah lol, no, I think you're thinking of a completely different user who posted that unhinged video about John Rennie and physics.SE
ah yes
Apr 12, 2018 at 13:13, by Slereah
Maimon's ban ends on august 8th 2026
Oh man I guess he did something extra since then
what are the list of reasons for network wide ban?
i guess i shud leave it
at least his answers exist
yeah, they're not gonna tell us the details
Dead men tell no tales
glS
glS
14:52
and directly from the source: qr.ae/pylBKn
(amusingly, he's also banned on quora lol)
🙏 thanks
he says he was banned for protesting censorship

« first day (4670 days earlier)      last day (554 days later) »