The h Bar

12:51 AM

BTW, does anyone actually know what user12... thinks his notation means?

1:06 AM

@dmckee no clue

user54412

5:26 AM

@dmckee Oh I didn't mean to imply this particular person was doing anything serially. But it's certainly not the first time I've seen these sorts of silent edits happen months or years after the question was posted.

user54412

Do people lie awake at night for months on end, unable to escape the thought that their lives would be better if only their question wasn't labeled as homework?

A: Why do we allow anonymous users to suggest edits?

I admit to such "silent edits" years later.

But, I don't lie awake thinking about it :D

The Dark Side

5:45 AM

WTF?

physics.stackexchange.com/review/suggested-edits/99100

user54412

2

No, anonymous edits are not useful. If someone can't be bothered to register an account (with anonymity! they can be user137103820382), they are unlikely to care about the well-being of the site. Moreover, they are almost certainly unaware of the site's culture and policies. Most every anonymou...

user54412

Not sure why so few people believe me on this one.

Q: Is it okay to ask question to which you know the answer but not sure of it?

6:02 AM

I'll have to agree with you on this one.

Danu

7:46 AM

@ChrisWhite I've seen a number of instances where the anonymous editor seemed to be the OP (typically inexperienced users who probably didn't understand that they weren't logged in or something)

Needless to say, this kind of anonymous edits are not harmful, though a bit silly

Physics Meta

10:22 AM

0

There are certain concepts I think I know but I am not sure if that's the right way to understand it, so is it acceptable question on physics stack exchange. And how should that question be framed, should be it be sort of yes-no, or should it have an element of discussion?

11:37 AM

Good moooooorning

A: Community Promotion Ads - 2015

12:01 PM

hey

The Dark Side

@ChrisWhite My "WTF" was actually in response to that rubbish edit being approved by someone!

Emilio Pisanty

12:29 PM

Hey folks

Care to upvote?

0

I don't know why I hadn't seen this earlier, but we still have some three months left to have this on the community ads rota

FenderLesPaul

1:10 PM

@EmilioPisanty upvoted :)

vzn

2:02 PM

@FenderLesPaul saw these guys last nite. awesome! recommend them if you ever get a chance! :)

Q: What is the description of measurement in the Heisenberg picture?

0

In all the books I've read this picture is presented only briefly, by essentially saying that in the HP the whole time dependence is assigned to the operators (representing observables), whereas the state vectors do not depend on time, and remain unchanged no matter what. Then, the derivation of ...

quantum-mechanics quantum-field-theory

^can someone edit this for more readability perhaps

add some dollaz

mb paragraphs

2:28 PM

I seriously don't know if this Physics.SE member is trolling me or not.

Like, I want to help him understand special relativity better, but he seems to keep thinking that I'm trying to advocate for some physics other than relativity where time ticks backwards and where there is a preferred frame of reference and all sorts of things, and he seems to balk at those, but of course none of those are a part of what I'm telling him.

But the kicker is that he doesn't want to do this with Lorentz transforms explicitly and just be done with it.

Try using spacetime diagrams

I tried to convince him to follow the math with me; but he didn't want to give the two coordinate systems the same origin event, and I am getting too old to be bothered with what the Lorentz transform looks like in affine form.

Lorentz transforms are just shearing of the axis then

There's no Lorentz transform in affine form

@ChrisDrost Is his name -- oh... I probably don't want to get chat banned like some people.

Maybe. I'd need to convince him to get out of the comments thread and open the question up publically so that I could share images.

2:33 PM

the Poincaré transform is affine

Still annoying to deal with, like the fact that when you convert Fahrenheit to Celsius you first have to mentally subtract 32.

@NeuroFuzzy physics.stackexchange.com/questions/207906/… is the thread.

Q: What are skeleton diagrams and what is their use in qft and many-body physics?

1

How does one construct skeleton diagrams from specific Feynman diagrams (e.g. for the electronic Green function in QED and in many-body gases, for the polarization function, for the vertex function, for the photon Green function, for the phonon Green function)? Explanations and references for act...

quantum-field-theory quantum-electrodynamics many-body

Skeleton diagrams and ghosts

QFT is too spooky for my taste

Q: What are pre-requisites for studying Brownian Motion?

2:48 PM

@Slereah Heh. Very halloween though.

Physics Meta

3:01 PM

0

I know Classical Mechanics(Feynman Lectures of Physics), Fluid mechanics(BR Munson) and basic Thermodynamics(not the part which includes statistical mechanics). Can I study Brownian motion on this basis or should I learn statistical mechanics first in order to really understand Brownian motion? A...

support books

FenderLesPaul

@vzn that looks sweet dude

thanks for the recommendation

@ChrisDrost imo he is trolling you because of his refusal to accept mathematical consistency clearly demonstrated here. I would suggest to let it go, and wait and see if he comes back with acceptable questions, if not you know he's a troll :-)

vzn

@FenderLesPaul so what rock/ blues are you into/ playing? have an electric guitar myself, the squier fender stratocaster for rock band III. got started on it (learning thru the game tutorial) but not enough time to go further :|

3:29 PM

I apologize if you @ChrisWhite got pinged also when I pinged the other Chris and vice versa @ChrisDrost :-/

Perhaps I'm the troll };-D

FenderLesPaul

3:42 PM

@vzn for rock I typically play classic rock from the 60s and early 70s

blues I try to learn techniques of Muddy Waters, Albert King, B.B. King, Howling Wolf, Robert Johnson (although he's impossible to learn so I stopped trying), John Lee Hooker, and SRV

SRV is a favorite

The legend.

Secret

http://i.stack.imgur.com/RVJqB.png
Expt=Pics 1

@TheDarkSide Thanks for bringing that to our attention. Reviews are important and bad reviews run counter to our quality control goals. If you see something egregious like that, let us know, we can check the user for indications of roboreviewing.

@dmckee who is that in your avatar?

That's me. The image was taken at by my wife at a coffeeshop and has been worked over BeFunky.

3:55 PM

cool

It has a James Dean look to it :-)

Secret

4:30 PM

http://i.stack.imgur.com/oR8wU.png
Expt=Pics 2

5:26 PM

@ChrisDrost bright magnus has been avoiding posting either questions or answer for some time.

He has some strongly held incorrect ideas about relativity and won't be talked out of them.

Not accepting logic is one of those ideas :P

Of course it doesn't help that that question is phased in terms of length contraction because that is a delicate idea that requires you to be very careful about what you mean by $\ell_0$.

6:45 PM

Woo, new PC

7:04 PM

cool

@dmckee "Rather, the public (even the educated public) has stopped paying much attention to philosophers in general." I doubt that that even coincides with the early 20th century.

Although it might be reasonable to assume an increased public interest in physics from (around) that time.

7:24 PM

There are 69 instances of "Feynmann" on the site.

As in usernames?

There are 55 instances of "t'Hooft" on the site.

3

@Rigor As in misspellings of the guy's name.

I see.

What is an "udder boat"?

@Rigor It's a thing. A Scandinavian thing.

Ok.

THE KILLING III (REVEALED AS NONSENSE)

7:37 PM

►

Ah, that explains it. Thanks @GlenTheUdderboat

Qmechanic

8:09 PM

@GlenTheUdderboat : Funny how the conversation "It was suicide. So we forgot all about the book." in the subtitles reads "Your sailboat? Glen The Udderboat".

Gridley Quayle

8:40 PM

This might be somewhat of a stupid question which is why I am asking it on the chat:
If energy is equivalent to work done (Force x Distance), how does it work that Gravity has a finite energy (GPE) but acts over an infinite distance? Is it just that gravity cannot actually move an object over an infinite distance and therefore not transfer an infinite amount of energy?

Notice that the force of gravity asymptoptically approaches zero as the distance increases? The integral of the work is finite.

@GlenTheUdderboat Any of "thooft"?

9:04 PM

9491 Thooft

Asteroid 9491 Thooft is named for 1999 Nobel physics laureate Gerardus 't Hooft. The laureate 't Hooft has drawn up a constitution for future visitors of the asteroid, poking fun at the IAU's naming conventions, as in article 4 with, "Since the I.A.U. was unable to place an apostrophe in the name of 9491 Thooft, any other uses of apostrophes on 9491 Thooft or within its territorial zone will be outlawed. No keyboards that have an apostrophe key will be allowed on the asteroid." == Notes == == External links == Naming of two asteroids, and link to constitution for 9491 Thooft...

9:38 PM

downloads Pluto image on hotel Wifi

ok this is taking a while

10:02 PM

"UC San Diego Raises $177.5 Million to Break Campus Fundraising Record". Seems like there should be other goals to fundraising than breaking fundraising records :^)

10:33 PM

Give us some of that money

We could build a research reactor

Then we wouldn't have to drive to ORNL to get neutrons

Well we would but...

then you'd beat our fundraising record.

@0celo7 you know what's funny, I bet some of the money did go to a particle accelerator. en.wikipedia.org/wiki/Proton_therapy#Treatment_centers