anyone know about neutron stars and their collapse into black holes?

I just lost my flag hat

or do you have to get it again every day

I don't think you can lose hats

Anybody know where i can find an electrical engineer to consult for a problem I'm having with my science fair?

wow, this quarantine hair hat fits best on ACM

@ACuriousMind "There was a bug in the hat trigger that resulted in the Vexillologist hat being awarded to users who shouldn't have received it. All hats awarded prior to 2020-12-16 13:18 (UTC) have been revoked, and been re-awarded only to users who actually qualified for it"

thats why

Any idea how to do it?

@RewCie just write out the tight asymptotic bounds

then its just logarithm identities and inequality manipulation

or even faster, just use $a = \Theta(b)$ implies $b = \Theta(a)$

@NiharKarve gotcha

Thanks :)

Can anyone give me a satisfying justification of benefits of studying history

No benefit, the past doesn't exist

history of physics or history in general?

Those who do not learn the lessons of history are doomed to repeat aphorisms

Huh, neat. If you input the Konami code (up up down down left right left right b a [return]) on the winter bash site it unlocks an easter egg game

@SirCumference there is a special place in Hell reserved for whoever thought that one up :-)

Unbelievable! china become successful in landing its rover contains 2 kg moon samples on earth after Russia and us it became the third country to do it

chang e 5

helo everyone

oh just two people wow

konnichiwa

@NiharKarve こんにちは

hi guys

I am thinking about a question

The state you end up with is the projection of your pre-measurement state onto the eigenspace of that energy eigenvalue

Note that if your Hamiltonian is time independent your system will evolve in such a way that it remains in that energy eigenspace.

@JohnRennie :^)

It does actually unlock Hat Dash if you're logged out (though I was hoping to get someone lol) but it doesn't save the score

Not sure what logged out user would ever enter the Konami code on a random website

@SirCumference I've been redirected to a strange video...

:\

@RewCie you've been Rick rolled! :-)

@JohnRennie There's definitely a lot worse "strange videos" you can get redirected to online lol

So it's almost a good thing to be Rick rolled given the alternative

Does anyone knows italy

Language?

hi

thanks prateek

Is hbar open?

uh, it's never closed?

shut er down

Ah, the good old days are back

@RyanWans what are you working on?

here @RyanUnger

I propose we arbitrarily close this chat room for 8 hours a day at some inconvenient time.

lol

you sound like a government administrator :-)

@PrateekMourya, I do, in case you still need it

I have a curiosity to ask if anyone is interested. In QED or QCD, for what I have seen, sometimes some physical interpretations of the running of the coupling are given. Like the screening in QED and antiscreening in QCD of the respective charges. Yet these interpretations rely on the idea of virtual particles, which for what I know comes only in as internal line of Feynman diagrams, as we have a perturbative approach.

So these interpretations are limited only to the perturbative theory? I guess these couldn't be given as interpretations in a non perturbative theory, in order to have a physical intepretation of the running of the couplings. Does this make sense, or I am missing something?

actually something similar happens even with the dependence of the factorization scale in the parton distribution functions in QCD

@vzn Using induction coils to charge a drone

@PrateekMourya yes

@PrateekMourya oh no

@Ratman I agree, most of the stories people often tell about QED mistake the lines in a Feynman diagram for something that "actually happens", when they're just a tool of perturbation theory. There is no non-perturbative notion of virtual particles, even though you sometimes get people trying to redefine the term (see e.g. physics.stackexchange.com/a/275099/50583)

Thanks a lot for the link @ACuriousMind , For my limited knowledge I think I agree with your answer to the post. I even find interesting the idea of strassler, even if to me It seems he Is trying to solve a non perturbative problem, such as an exact description of the interaction (mediated by something with a physical meaning likes a dressed propagator) through perturbative notions. Anyway I have proably to ready It more carefully tomorrow

The most confusing aspect to me probably Is that of the culomb potential. I found It quite strange the firs time i cane across It. While justifications that rely on Hesinberg indetermination principle are quote absurd to me, given that there isn't a time operator

Btw Sorry for the typos, I had to writer from the phone, which doesn't enjoy me writing in english