The h Bar

Sir Cumference

12:15 AM

0celo7

@yuggib I was walking to the bathroom in the library and saw springer.com/us/book/9783540440857

should I read it

Sir Cumference

Holy crap

0celo7

page 1 are the ZFC axioms '-.-

Sir Cumference

Sorry I thought I posted that in the astronomy chat

0celo7

@SirCumference u stupid

Sir Cumference

12:17 AM

@0celo7 yeh

omg no

i realized i did it again when it was submitting

0celo7

did u go to school on the short bus

Sir Cumference

;-;

Sᴋᴜʟʟ ᴘᴇᴛʀᴏʟ

Stop bulling my pal.

Sir Cumference

:D

@Sᴋᴜʟʟᴘᴇᴛʀᴏʟ Wait who are ya?

Sᴋᴜʟʟ ᴘᴇᴛʀᴏʟ

Skullpatrol

Sir Cumference

12:20 AM

Ok

0celo7

good lord this book is scary

@yuggib plsno

@yuggib I refuse to read this!

@0celo7 What book?

"Set Theory"

12:39 AM

1:05 AM

0

Q: Physics SE is for who?

Are non-physicists allowed to ask questions on physics SE? I get the impression that only people with a good (vast?) knowledge of physics are allowed to ask questions here. Should we turn people away when they say theyre 16 years old or e.g. if someone expresses a lack of understanding of unit...

discussion

dmckee

2:23 AM

With all the drama-queen trash taking place on the main site and meta, this

2

Q: Can the Hall effect drive a current?

In the Hall Effect current is passed through a wide strip of metal in a perpendicular magnetic field. Since (some of) the negative charges in the metal move but the positive ones stay put, the magnetic field will cause a potential difference between the two sides of the strip: How can this pot...

electromagnetism electric-circuits electrical-resistance

surprisingly deep question has be sadly overlooked.

Physics Meta

2:41 AM

-1

Q: Physicsoverflow question

What exactly is physicsoverflow.org? ive recently seen a couple of my questions pop up on that website. (Which is intruiging because when posted on physics SE my posts seem to draw the ire of 2 or 3 influential people yet physicsoverflow seems to find them useful) Is it better than physics SE?...

discussion

knzhou

2:51 AM

Meta is getting ridiculous.

Is there a cap on the number of questions somebody can ask?

dmckee

3:07 AM

@knzhou I think users are subject to the usual low-rep limits, but that's simple not consequential in this case.

I've recused myself on this case of moderation duties, however, so we'll just have to wait.

Sir Cumference

Does anyone know how long it takes to learn GR?

dmckee

@SirCumference Depends on your choice of coordinate system.

I mean, seriously, there is damn all that you can count on beyond local measurements, right?

Sir Cumference

Er, so how long would I have to study GR to become an astrophysicist?

dmckee

Most folks going that way try to have some contact with the subject in their undergrad and then really wade in during grad school. If their specialization calls for it, but many of them do these days.

Sir Cumference

?

dmckee

3:10 AM

I mean, you could do stellar formation or exoplanets without it, right?

Sir Cumference

Yeah, but what if I want to accurately understand gravity?

Or I want to go into cosmology?

dmckee

But cosmology or the life-cyle of hig-mass stars, active galaxtic nuclei and so on all call for it.

Sir Cumference

Okay, what if I wanted to research black holes?

Or the Big Bang?

Just how long did it take you to learn GR?

dmckee

@SirCumference Then you're going to be working on for essentially all of grad school and (if you're lucky) your post docs and after you get on the tenure track and ...

It never ends, you just follow the rabbit hole as far as you can.

If you go with those subject you've signed up to be a GR researcher.

Sir Cumference

Okay, how long of studying GR in school does it take for you to become a cosmologist?

Or for how long did you study GR in school?

dmckee

3:13 AM

A year in the class room and a few years doing your research, I suppose.

Sir Cumference

How long's "a few years"?

On average?

dmckee

You might check with the AIP's survey of earned doctorates, but the only time frames I know with any certainty are for experimental nuclear and particle people.

Sir Cumference

Ok, so next question

How long does it take to learn QM and QFT?

0celo7

good evening

@SirCumference years

define "learn"

dmckee

Let's see. At my last post doc I knew a guy working on a theoretical cosmology thesis. He was in grad school around seven year. His advisor was getting impatient, too.

@SirCumference Same answer for QFT. You can be applying them to your research after a couple of years of grad school, but the horizon is endless.

Sir Cumference

3:16 AM

@0celo7 Be able to teach classes and answer a variety of questions from other curious physicists

dmckee

Depends what level the class is at and how prepared the physicist are. And you should fear smart twelve year-olds. They're the worst.

0celo7

@dmckee That's still not clear to me.

Maybe I should read a GR book for, you know, physicists, and figure out what the hell the theory is about

Sir Cumference

Ok, so how long would it take me to become as knowledgeable in GR or QM as, say, @dmckee?

Just for comparison

0celo7

@dmckee How much GR do you know?

In 2016 ;)

Sir Cumference

@0celo7 How do you quantify that?

dmckee

3:18 AM

@SirCumference A one semester class and some hard thinking can bring you up to my level in GR. I suck at it.

Sir Cumference

@dmckee um...k

0celo7

@dmckee No offense but I'm surprised it would take that long. You've said you've forgotten all of the math

dmckee

I had three semester of formal QM in grad school, plus I took Waleka's theoretical nuclear physics class. And I've applied the theory now and again for about twelve years since graduating.

@0celo7 Fair enough.

But I bone up when I need to do something serious with it.

0celo7

@SirCumference dmckee is a particle experimentlaist, he has no reason to know any GR.

Sir Cumference

So about twelve years of learning would bring me to your level?

@0celo7 Oh yeah...

0celo7

3:20 AM

Except maybe in his intro modern physics class they cover some basics

dmckee

@SirCumference Well, if we're assuming you're as dense as I am, and only look at it a few times a year. But maybe you're one of the smart ones.

Sir Cumference

All right, how long of learning GR would it take for me to teach numerous graduate level classes?

dmckee

@0celo7 It's on the schedule, but we seem to lose a couple of week in SR each term, and I end up skipping it.

0celo7

@SirCumference depends what GR

Sir Cumference

Nine years? Six years? A year?

@0celo7 Sigh...all right, fine. How long would it take before I know as much about GR as Albert Einstein?

Why not?

0celo7

3:21 AM

Someone who does GR exclusively does not exist in the US

dmckee

@SirCumference All of grad school (mostly applying it, not classroom stuff) and perhaps a postdoc or two. The thing that makes you ready to teach grad students is both mastering the book learn'in and then using it.

0celo7

@SirCumference maybe 2 semesters

the theory was not well understood at all while he was alive

Sir Cumference

@0celo7 ;-;

0celo7

there's more in MTW than he knew about

he did not even believe black holes were real

but even then, you probably would not be able to teach the GR class I want my adviser to do

dmckee

@0celo7 Of course, I note that we keep seeing hyperbolic stories in the media about how they're in again and then out again. And the abstract look to this ignoramous like we're still pretty unsure of a lot of detailed behavior around the nominal horizon.

0celo7

3:23 AM

even then = after all that crap dmckee said

Sir Cumference

Okay, so how long of learning QM and QFT would it take for me to teach numerous graduate level classes?

0celo7

@SirCumference what kind of questions are these, anyway

user218912

what kind of questions are these?

Sir Cumference

@3750 :30941471 ;-;

dmckee

@SirCumference All of your grad school classroom time and then some years of applying it.

Sir Cumference

3:25 AM

All right, cool

dmckee

But getting the job at a department that teaches graduate students is the hard part. If you can manage that you'll have the preparation.

Sir Cumference

I've got my plan

user218912

@SirCumference are you my age?

0celo7

@dmckee I don't have a handle on all of that quantum nonsense :P

Sir Cumference

@3750 17?

user218912

3:25 AM

what year are you?

Sir Cumference

@3750 Graduated

user218912

ok same age then basically.

Sir Cumference

Born in December

You?

user218912

january

0celo7

@SirCumference Jesus

I thought I was young

Sir Cumference

3:26 AM

@0celo7 No, but I appreciate how you feel about me

I'm not Jesus tho

0celo7

@SirCumference You are Jewish

user218912

lol

Sir Cumference

@0celo7 Yeah?

0celo7

I should probably eat dinner sometime

Sir Cumference

@0celo7 What year, what month were you born?

0celo7

3:27 AM

@SirCumference Not telling you so you can steal my identity

Sir Cumference

December 1998

@0celo7 Wat

@3750 So you're Jan 1999?

user218912

0celo7 said it before search the chat.

Sir Cumference

I'm lazy

user218912

@SirCumference no 1998.

Sir Cumference

Oh .-.

I'm young

0celo7

3:28 AM

you're 11 months apart and in the same age group

@SirCumference I literally just said that

user218912

what university are you going to? @SirCumference

Sir Cumference

Confidential

0celo7

I bet @3750 could have kicked your ass when you were kids

Sir Cumference

Rather not make a big deal out of it

0celo7

11 months makes a big difference

user218912

3:28 AM

@SirCumference what...?

0celo7

@SirCumference lame

Sir Cumference

I already revealed my ACT scores which was a mistake

user218912

nobody cares dude

0celo7

@SirCumference weirdo

Sir Cumference

@0celo7 No u

0celo7

3:29 AM

@SirCumference No. You're the weird one.

user218912

you ARE being weird by not revealing your university.

Sir Cumference

@0celo7 No u

0celo7

@dmckee how goes the summer

Sir Cumference

It's something I'd rather not reveal

0celo7

fail anyone yet

user218912

3:29 AM

unless it's some really bad one you're embarrassed to tell us @SirCumference

Sir Cumference

Like HDE not stating where he's from

@3750 It's a good one, which is why I don't want to make it public

0celo7

...what

user218912

lol

Sir Cumference

Ok...lemme explain

user218912

you don't want to show off?

Sir Cumference

3:30 AM

I don't like to make good things I've gotten public

user218912

why?

Sir Cumference

Or else people get a vendetta towards you

0celo7

it's not showing off if you're asked, idiot

user218912

...

Sir Cumference

It's my credo

0celo7

3:30 AM

@SirCumference it's the internet

Sir Cumference

Telling 0celo7 my ACT wasn't a good idea

0celo7

if someone has a vendetta, block them

i don't even remember it

user218912

we don't even know your name or how you look like.

Sir Cumference

Making my school known is an even worse idea

0celo7

stop flattering yourself

user218912

3:31 AM

xD

Sir Cumference

@3750 I have curly hair

0celo7

ok, I do remember that you're jewish

I could look for a little jew hat I guess

pick you out that way

Sir Cumference

@0celo7 "Little jew hat?"

user218912

is that offensive to you?

Sir Cumference

Ya mean yarmulke?

0celo7

3:32 AM

@SirCumference sure

Sir Cumference

@3750 No it's just weird

0celo7

this is a strange conversation

Sir Cumference

But anyway, I got my life plan straight. Imma go to med school, while learning GR and QFT as a side project

user218912

what...

Sir Cumference

Just so I feel a bit more fulfilled in my life

user218912

3:33 AM

you'll be like deepak chopra

Sir Cumference

@3750 Who?

0celo7

who?

deepak is a dutch hardstyle act

Sir Cumference

@0celo7 A what?

0celo7

@SirCumference what part is unclear

Sir Cumference

@0celo7 "Hardstyle act"

0celo7

3:34 AM

did you try googling it

Sir Cumference

What on earth is that?

I'm scared it's some sex technique

user218912

deepak is this loser doctor who applies quantum mechanics and cosmology to healing and stuff.

0celo7

you're gonna flunk out of of med school with that attitude

user218912

basically bs lord.

Sir Cumference

@0celo7 Okay fair enough

@3750 I'm not gonna apply it. But I wanna learn what interests me.

It's fulfilling

0celo7

3:36 AM

besides, what kind of weirdo teenager is worried about a sex position

Sir Cumference

@0celo7 I'm pretty sheltered, I'll be honest

0celo7

I can help you

user218912

???

0celo7

www.4chan.org

Sir Cumference

Uh no thanks

0celo7

3:36 AM

go to /b/

Sir Cumference

@0celo7 Uh definitely no thanks

0celo7

read, absorb

user218912

what does /b/ stand for

0celo7

@3750 random

dmckee

@0celo7 A bout a third of my class is really struggle with vectors (Still! More than halfway through!) and that's slowing things down.

user218912

3:37 AM

@0celo7 do you browse there?

Sir Cumference

As I have no idea what the opposite gender's...parts look like, I consider myself kind of innocent

user218912

it looks scary.

user218912

@SirCumference didn't you learn in school?

Sir Cumference

@3750 No because most of my class just kept repeating stupid crap, so we never learned much

0celo7

@3750 of course

@3750 no?

@SirCumference hahahhaha

Sir Cumference

3:39 AM

@0celo7 ._.

0celo7

no, that can't be right

hahahahha

Sir Cumference

Stahp...

user218912

then you're not curious enough to become a scientist.

0celo7

That's either the funniest thing I've heard in a week

or a lie

Sir Cumference

Maybe this is why I don't have a GF...

0celo7

3:41 AM

definitely the most awkward chat conversation ever

@SirCumference lol

Sir Cumference

@0celo7 Yeah I'mma remove some stuff

0celo7

It's too late

Sir Cumference

Er what

0celo7

We now know you don't know what a vagina is

Sir Cumference

Of course I know what that is

user218912

3:41 AM

@SirCumference you're like me, you spend a lot of time on physics but in the end you don't know a single thing.

Sir Cumference

I just dunno what it looks like

So I'm not innocent! Ha!

...

0celo7

wew

Sir Cumference

You dunno my life...

For all you know, I could be your brother

0celo7

@SirCumference look it up right now

Sir Cumference

@0celo7 Lemme alone

0celo7

3:43 AM

@SirCumference my brother is married with kids, he knows what it looks like

Sir Cumference

@0celo7 According to QM, there's a chance that I am exactly where your brother is. Thereby making me your brother.

user218912

@SirCumference see what I mean?

0celo7

that's bullshit

user218912

you don't know any physics.

user218912

neither do I but

Sir Cumference

3:44 AM

NO! YOU DID NOT STAR ME...

user218912

I don't say dumb things like that

user218912

or do I

Sir Cumference

That's not okay...

0celo7

@3750 you don't

Sir Cumference

According to QM, you do and you don't

0celo7

3:46 AM

stop

user218912

lol

Sir Cumference

I'm hiding that message

0celo7

we still know

user218912

wow.

user218912

abuse.

0celo7

3:46 AM

just...look it up

it's probably not healthy to live like that

Sir Cumference

Probably not...

I dunno, hopefully I'll learn it eventually

user218912

why did you star all my messages and 0celo7's?

Sir Cumference

@3750 Because he starred my message about me being innocent...

user218912

if you don't remove the stars I'll star your message you're trying to hide.

Sir Cumference

I'd really not like that publicized

user218912

3:47 AM

and it will go to the top for a week.

Sir Cumference

...

You're an ass...

user218912

no.

user218912

I just don't want my messages starred.

user218912

for no reason

Sir Cumference

Well excuse you, neither do I

user218912

3:48 AM

it was for a reason though

user218912

0celo7 found it to be necessary

Sir Cumference

I found it necessary to hide it

Please just let bygons be bygons

0celo7

I think it's hilarious

Sir Cumference

Listen, you do you

I do me

And we don't do each other

...yeah lemme fix that wording

user218912

you're weird

user218912

3:49 AM

dude

Sir Cumference

Son of a...

0celo7

@SirCumference did you star that

Sir Cumference

Dammit!

user218912

2 people did?

0celo7

I starred it, of course

Sir Cumference

3:50 AM

Now the thing won't go away!

You monster

0celo7

lel

user218912

I see.

user218912

lol

0celo7

@dmckee What's troubling them?

Sir Cumference

YES! Wooooooooooooo

So...yeah...

What's up with you guys... ._.

user218912

3:52 AM

sorry but by tomorrow all the 1 stars will disappear.

user218912

and go down.

Sir Cumference

No...

NOOOOOOOOO

0celo7

2 Chainz - Watch Out (Explicit)

►

@3750 ^

user218912

if you feel bad just ask a mod to remove it.

Sir Cumference

"It's only the internet" they said. "You can be as honest as you want" they said.

user218912

3:53 AM

@0celo7 what?

0celo7

@SirCumference you can

but if you say silly things, expect people to make fun of you :P

user218912

@SirCumference you're behaving like a child.

Sir Cumference

@3750 Sigh...

Where did I go wrong...

user218912

0celo7 gets dumb things starred all the time but he doesn't care.

0celo7

I do?

user218912

3:55 AM

Idk

Sir Cumference

@0celo7 Well, kinda, with the JavaScript vs Java thing...

0celo7

everything I say is carefully crafted

@SirCumference what

Sir Cumference

0celo7 doesn't have JS

Mar 21 at 2:24, 5 minutes total – 31 messages, 3 users, 4 stars

Bookmarked Mar 21 at 2:31 by Sir Cumference

0celo7

I still maintain I do not have JS

Sir Cumference

@0celo7 Of course you do. JS is used to make websites

Java is used to write programs

This chat uses JS

0celo7

4:00 AM

nah

user218912

books.google.com is really useful for finding a book on a specific topic you need.

Sir Cumference

@0celo7 Somebody star this, please

It deserves a star

0celo7

why

Sir Cumference

4:17 AM

Same reason mine did

@dmckee Sigh, could you, uh....remove that message of mine that has 2 stars?

Without laughing?

0celo7

lol

John Rennie

5:22 AM

@SirCumference I've cancelled the stars. I cannot delete the post without leaving a link to it so I suggest you just let it quietly hide amongst the crowd of random chatter. If it gets restarred ping me and I'll cancel the stars again.

Sir Cumference

@JohnRennie K thanks a ton

yuggib

5:36 AM

@0celo7 It is a very interesting book

I suggested it to @MAFIA36790 ;-)

skill patrol

\o @yuggib

yuggib

it is a standard reference if you are interested in forcing and the alike

@skillpatrol o/

@0celo7 It is apparently so interesting they stole it to me once in my office during the PhD T__T

it was the university copy, so I had to buy it back to them

damn

skill patrol

Stealing books is so... juvenile

(except ebooks ;)

user54412

@JohnRennie So I'm here in England for essentially the first time, and I must say the weather is exactly what the stereotype said it would be. And that's great, since back home it was 100F/100% humidity.

skill patrol

5:51 AM

Have you begun preparations to move to the best coast yet? @ChrisWhite

user54412

I'm realizing I can't afford the best coast :(

skill patrol

:(

user54412

3k for studios without any amenities? how? who is buying these things?

user54412

Like, I've never met anyone in Berkeley who I would describe as stably employed. But somehow they're all rich.

skill patrol

yup

user54412

5:55 AM

And they still find money left over for all the drugs.

skill patrol

prescription not required ;)

user54412

"Shared: <famous scientist>'s MacBook Pro" -- that's when you know you've connected to the wifi at an academic conference.

skill patrol

that's the life style of the rich & famous

Those who can afford a MacBook Pro

Did they stop the conference during the soccer game today? @ChrisWhite

John Rennie

The UK sits on the border between two supercells, and on the border between the Atlantic and continental weather systems. As a result the weather is extremely sensitive to small perturbations, making it, erm, interesting :-) There's a reason the British traditionally talk about the weather all the time ...

user54412

today is only 7 hours old...

skill patrol

6:03 AM

I meant yesterday

your time

yuggib

@skillpatrol it cost me 130 bucks...

skill patrol

@yuggib ouch!

user54412

I'm not sure I had a yesterday.

yuggib

@JohnRennie I claim that by all means, Caribbean weather is more interesting than British weather ;-P

John Rennie

@ChrisWhite When I worked for Unilever I used to go to New York quite a lot because they have a research lab in Edgewater. I think it's a lot easier flying west because it just extends your day - you in effect stay up late the first day and you're OK after that.

Flying east is worse because you either stay up 17 hours longer or go to bed 7 hours early. Either way is hard.

@yuggib admittedly we don't get hurricanes, or at least not very often :-)

skill patrol

6:16 AM

Still leaving 100F/100% humidity is worth the jet lag

David Z

7:16 AM

26

Q: PSA: Please don't post images of text

When asking or answering questions, please don't post screenshots of text. This is a very bad idea because: You can't copy/paste the commands into answers, google searches, local files to work on a solution, or anything else. They won't come up when searching The post is heavier (in terms of th...