The h Bar

0celo7

05:00

this level of memeness implies Rick and Morty level intelligence :o

good night

nice try lorenz

0celo7

lorenz?

good night

sorry i forgot you don't watch rick and morty

0celo7

I do

good night

then your iq isn't high enough to understand it clearly

0celo7

05:01

I'm just always doing quantum calculus and don't pay attention to the less funny parts

good night

true

oh ya well in that case

let me explain

@0celo7 @Narcissusjewel confessed to flagging but that was only a front to cover up for his real plan which is pretending to be a butterfly so nobody can see that he's actually a lorenz attractor trying to seduce innocent physicists in this chat

but since i watch rick and morty i was able to see right through it and foil his plans

@PrathyushPoduval hello there

I am a big fan of your music

Prathyush Poduval

Hey

good night

Woah Me Up Inside

►

love it

heh a little secret between us physicists whens that new album dropping? :p dw i won't tell anyone

0celo7

what happened to you

how did you become better than @BalarkaSen

Prathyush Poduval

@goodnight I don't make any music, I just listen to 'em. You do have nice taste in them though

It has been a while after listening to whoah memes

good night

05:13

@0celo7 took 3 moon rocks daily with my cheerios right before levelling up and hey i actually evolved who would have thought.

0celo7

surreal

show me a mind-melting meme

@ACuriousMind @Loong Wie sagt man eigentlich $\mu$ und $\nu$ auf Deutsch? Gibt es eine Liste for griechische Buchstaben auf Deutsch?

rob

@0celo7 I'm imagining the famous Dali painting, but with melted, drooping brains rather than melted, drooping clocks.

Bernardo Meurer

@rob I read "cocks" and was really confused

good night

@0celo7 sure

gimme a min

0celo7

@BernardoMeurer Not very Christian.

Bernardo Meurer

05:21

@0celo7 Of course it is

I am confused at profanity

What is wrong with that

dmckee

Ewh. I ust did a horrible thing:

Er ... I don't have my copy in front of me, but doesn't Zemansky use a barred $d$ (i.e. $\,\bar{~}\!\!\!d$) in that context? — dmckee ♦ 3 mins ago

good night

@0celo7

fresh one for yuh

0celo7

holy crap

@BalarkaSen you're done

dmckee

The code is $\,\bar{~}\!\!\!d$

0celo7

@goodnight is the meme god

good night

05:24

tbh i'd rather be a qft god but i'll take it

don't

mind

0celo7

can you compute the amplitude for beta decay

good night

if

i do

0celo7

ok, show me

what's the relevant propagator

good night

i don't remember shit

i finished qft last december

0celo7

@BernardoMeurer FORTRAAAAAAAN

good night

05:26

but we're making a comeback

sooooon

Bernardo Meurer

@0celo7 How can I help?

rob

@dmckee I think you want one more \!, so that the bar crosses to the right of the ascender a little bit.

good night

i can feel it but i can't reveal the details

0celo7

@BernardoMeurer moral support

rob

Compare: $\bar{~}\!\!\!\!d$ $\hbar$

Bernardo Meurer

05:27

@0celo7 Alright, hop on Skypz

good night

whoah can we do discord please

join phase's server

0celo7

no I'm on linux

good night

urg

Bernardo Meurer

@goodnight I can do it

Right now if you want

0celo7

does discord work on PC

also I'm listening to the greatest rapper of all time

Bernardo Meurer

05:28

@0celo7 yaourt -S discord-canary

dmckee

@rob Well, I was just cobbling something together. I have a much more precise macro I use for real LaTeX, but MathJax doesn't like it.

0celo7

@BernardoMeurer gdi

Bernardo Meurer

discord.gg/7ZwxUH

0celo7

@dmckee I get the feeling that thermodynamics is an unholy mess and i never want to have anything to do with it

good night

@JohnRennie waddup did you see the funny i made for you

i put in 30 mins of effort please acknowledge it

dmckee

05:30

@0celo7 A lot of the mess is due ot the historical development which was ratehr round-about and back-assward.

good night

includes brainstorming

0celo7

@BernardoMeurer what is this 10 minute timer for

you'd better shoot me before it runs out

dmckee

If you tackle it from a proper statistical POV from the beginning much of the confusion can be avoided. Which improves things so that it only sucks a lot.

John Rennie

@EmilioPisanty join the club :-) Reviewers rarely bother to look at posts in context, so once a flag has been raised you'll probably get a 30 minute suspension. The only way to avoid this is to keep all your posts anodyne, but this seems too high a price to pay for many of us.

@goodnight link?

good night

@JohnRennie look on the starboard

Bernardo Meurer

05:32

@goodnight Join it

@JohnRennie Morning!

John Rennie

@goodnight OK :-) I have to say that's not your finest work.

good night

@JohnRennie oh

John Rennie

@BernardoMeurer morning. So ... OpenSuse on Windows ...

good night

what's the finest

@BernardoMeurer im joining it but the captcha is taking forever to load

when i click the images it fades to white for like 5 seconds

0celo7

@BernardoMeurer join the link I sent you

Bernardo Meurer

05:33

@0celo7 Never

John Rennie

11 hours ago, by good night

0celo7

why the heck not

Bernardo Meurer

I want to be an owner so I can write a bot

That does things

good night

woah u gonna hek us

i thought this was christian

bad bot

John Rennie

That made me laugh for several minutes :-)

Bernardo Meurer

05:34

like pick random JD messages

And post them there

0celo7

@BernardoMeurer is it gonna be a Christian bot?

Bernardo Meurer

@JohnRennie Yeah?

@0celo7 Yes

It will be called "FOSS Templar"

John Rennie

@BernardoMeurer it works. It works really well.

0celo7

deus vult

Bernardo Meurer

@JohnRennie Nice! Suse is a nice distro :)

0celo7

05:35

@BernardoMeurer K has an AR15 wil deus vult engraved

we're a very Christian family

Bernardo Meurer

If only you had that back when I was taking that C class :P

John Rennie

I have to say that Ubuntu is friendlier when it comes to adding apps.

Bernardo Meurer

@0celo7 pics or it didn't happen

@JohnRennie You mean installing stuff?

John Rennie

On Ubuntu I typed firefox and it said "Firefox isn't installed" and gave me the command to install it.

Bernardo Meurer

Ah

Well

0celo7

05:36

@BernardoMeurer check your phone

John Rennie

On OpenSuse I had to Google for how to install Firefox

0celo7

check the fire selector

Bernardo Meurer

@0celo7 Oh my god

Yeah, I saw it

0celo7

Bellum

Deus Vult

It's amazing

Bernardo Meurer

It is

@JohnRennie Yeah, but you only have to learn it once :)

good night

05:37

10 min cooldown @BernardoMeurer

John Rennie

Is zypper the standard install tool on OpenSuse?

Bernardo Meurer

@goodnight Hum?

good night

i accidentally used my ult instead of messaging

Bernardo Meurer

I just gave you the role now

good night

06:16

thanks i love rolling

Bernardo Meurer

06:54

The Ting Goes Da Ba Dee Da Ba Die

►

Sir Cumference

07:13

Ya ever know when you get so tired you hallucinate or hear voices?

good night

@SirCumference how many all nighters are you on

Sir Cumference

@goodnight Er I think yesterday was my first

good night

@SirCumference ever heard of the shadow people

Sir Cumference

@goodnight no

good night

well if I were you I wouldn't leave the lid off my mayonnaise before bed

that's all I have to say

rip lil peep

Sir Cumference

07:20

and he leaves... >_>

Secret

07:38

2

I sometimes can resolve a boundary tone up to a resolution of 0.5-1 seconds

the way that tail changes in pitch gives you a lot of information on what the true intention of the person is

good night

@Secret nice i just give them the peroxide because that's what they really want

ACuriousMind

08:16

@0celo7 "Mü" und "Nü"

@EmilioPisanty You'd usually order it as a Helles, but yeah.

Slereah

Hello

Poor Fred Hoyle

All his achievments and he just went down as a joke in physics history

ACuriousMind

@EmilioPisanty If you have reviewed the queue in question in the last hour or so, the red dot will not show for you regardless of the fullness of the queue

@Slereah ?

Slereah

Fred Hoyle is pretty much only remembered as the guy who opposed the big bang these days

John Rennie

That's not really why he is a somewhat shady character

Yes he opposed the Big Bang theory, but he did so with a perfectly reasonable and experimentally testable alternative i.e. steady state

The real problem is that in his later years he started espousing all sorts of crackpot ideas.

Slereah

that certainly didn't help

But people mostly remember him as the anti-big bang guy

It's pretty hard even seeing him in a GR book

I think I only have Weinberg that even mentions him

John Rennie

08:28

Not the first and certainly not the last physicist to get a little ... erm ... eccentric in his old age :-)

@Slereah did he contribute much to GR? I thought stellar nucleosynthesis was his main area of contribution.

Slereah

Who knows

I don't have a lot of astrophysics lit

I should get one maybe

could always be useful

To know the SECRETS OF THE STARS

Cows

still up trying to get ready lol

Slereah

I remember that in the olden days the stellar model was basically "the sun is a giant ball of coal"

not the best model

but people didn't even know space was empty until like... I dunno, 17th century, at least?

I hate the NASA database of paper so much

It's nothing but JPEGs of pages

Cows

@ACuriousMind I looked at time-independent perturbation theory at some point today. Tomorrow sometime after 6 PM (or sometime after 6PM) Pacific time, I would hope to discuss time-dependent perturbation theory in QM with you. You down for this?

@ACuriousMind("you down for this" is a colloquialism for. . . are you available, willing and capable)? Let me know

ACuriousMind

08:43

@Cows No, that's 3am on a Saturday for me, when I'm either asleep or busy with funner things. Also, time-dependent perturbation theory is not really my forte - I guess that's what one is technically doing in LSZ formalism and the like, but I don't think I could talk confidently about it outside these specific applications.

Cows

ah, hmm

@ACuriousMind Who would you recommend I discuss this with in the chat?

John Rennie

@ACuriousMind kind of hard to do a Norton's dome experiment in real life though ...

Slereah

you'll need a perfectly smooth and continuous dome

also a universe where Newtonian physics applies

ACuriousMind

@JohnRennie Sure - I'm just pointing out that, rather counterintuitively, one doesn't need to invoke friction or any other "real life" factors to have spontaneous motion

Emilio Pisanty

@JohnRennie surely he didn't get worse than Josephson

ACuriousMind

08:58

That is, if one is very careful, the question "How can this move if no force acts on it?" is not actually justified by formal Newtonian mechanics - Norton's dome shows such situations are perfectly consistent with Newtonian mechanics

Slereah

You just need non-Lipschitz continuous functions :p

ACuriousMind

That naive causality (i.e. no force = no movement) is already violated by NM is a very powerful indication to me that we shouldn't expect physical theories to conform to our intuitions, even such "intuitive" theories like Newtonian mechanics.

@Cows I wouldn't recommend discussing it in chat, I would recommend carefully reading the relevant chapters in a textbook, and asking a question on the mainsite if after working through some examples there are specific questions left.

Slereah

Aristotle's mechanic only has movement when there's force

and it is much more intuitive

John Rennie

@ACuriousMind however such situations are not perfectly consistent with real life i.e. no experiment could ever observe them.

ACuriousMind

@JohnRennie That's why I didn't write a long answer berating OP for asking a non-sensical question, but instead just left a comment pointing out spontaneous motion is not incompatible with NM and upvoted your answer that probably told them what they actually wanted to know ;)

John Rennie

09:04

@EmilioPisanty Josephson is also remembered as a nut, but at least he contributed something with useful technological applications so he was a useful nut :-)

I don't know about the rest of Europe, but it is a wonderful sunny morning here in the UK.

Coldish for the time of year though not below zero. But a clear blue sky and bright sunshine :-)

Slereah

who cares for blue skies

i want warm

ACuriousMind

@JohnRennie Sun's just come out after a night/morning of frosty rain

Phase

@JohnRennie it's slightly cloudy and $0^oC$ here

John Rennie

@Phase where is here?

@Slereah I'm not that fussed about the cold. That's what we invented fire for. Rain is what really gets to me.

ACuriousMind

Snow would be great, though

Phase

09:17

@JohnRennie north

@JohnRennie those rare occasions of warm rain are to die for though

John Rennie

It's great waking up to find snow has fallen. It immediately brings out the child in me (admittedly that isn't hard). It's less fun once the traffic has chewed it into grey slush :-)

Slereah

@JohnRennie Can't light a fire in the office

John Rennie

@Phase North of Chester? There was no frost here ...

Phase

Yeah, north of ol' Chester

Anonymous

Do you people use room heaters or something like that (in the UK)? $0^{o}C$ is pretty cold!

John Rennie

09:21

Time to go out wearing just a tee shirt then :-)

(possibly some trousers too)

Phase

I normally just wear tshirts and shorts

@Blue I forget to turn mine on

Slereah

I wear nothing but a smile

John Rennie

@Blue most houses in the UK are centrally heated. In my day student rooms had a heater of some sort in them - gas or electric. I would guess that halls of residence tend to be centrally heated these days.

Phase

@Slereah and the screams of people who see you on the street?

ACuriousMind

@Blue You won't find any residence in Northern or Middle Europe without heaters in it

Phase

09:24

@ACuriousMind dont underestimate how cheap students and landlords can be

ACuriousMind

@Phase I think it would actually be illegal by German law to rent out something without heating as a place to live in (as opposed to rented storage space) :P

Of course, some student may be cheap enough to not turn on the heating, sure

Phase

Germany sounds nice

John Rennie

@Phase Germany can get very cold, as in die of hypothermia cold.

Phase

@JohnRennie do they have stuff for homeless peeps then?

Also I went there around Christmas once and I remember it being rather chilly

John Rennie

Pass

Slereah

09:25

Hm

Anonymous

@JohnRennie I see. It's probably necessary too. I stop bathing when temperature falls down below 15 here during winters (though that's rare) :P

ACuriousMind

@Phase Yes, there are homeless shelters but nevertheless some die of the cold every winter

John Rennie

I've never been homeless in Germany

Slereah

Can all rank 2 tensors be expressed as the tensor product of two vectors?

Phase

@ACuriousMind sad

Anonymous

09:26

@ACuriousMind Oh. I didn't know that!

Slereah

Oh wait, I guess they can, at least up to a factor

Since they're always the tensor product of the basis

$T = T^{\mu\nu}\partial_\mu \otimes \partial_\nu$

John Rennie

@Blue done today's exams?

Anonymous

@JohnRennie Yep, returned a few hours back! Tomorrow is the math exam

ACuriousMind

@Phase To be fair, you usually only become homeless in Germany if you actively refuse to take advantage of our social security systems

Slereah

Well, a linear combination of products, anyway

Anonymous

09:28

I'll ping you when I get back home tomorrow

Anonymous

afternoon (for installing linux)

Phase

@ACuriousMind you mean like Benefits?

ACuriousMind

@Phase Not sure what that is, but the state will basically pay rent (for a small flat) if you cannot.

Anonymous

German government seems to be too kind

Mr. Xcoder

moves to Germany

Anonymous

09:30

@Mr.Xcoder Same feel :P

John Rennie

@Blue no it damn well isn't.

Phase

@Blue have you been talking to 0celo7? : p

John Rennie

Mainland Europe generally puts the UK to shame, and as for the US ... words fail me

Actually the UK isn't too bad ...

Anonymous

@JohnRennie It isn't ? State paying rent for a small flat is almost unimaginable in most countries!

Mr. Xcoder

^

John Rennie

09:32

@Blue we're rich enough to afford it, and since we can afford it we should.

Phase

@Blue i think he's responding to the "too"

John Rennie

India isn't in that state yet, but in a few decades it will be

(maybe sooner given current growth rates)

Mr. Xcoder

Question: If a body doesn't fully submerge in a given liquid, is it true that $\frac{V_{submerged}}{V}=\frac{9}{10}$ (the body is in equilibrium)?

John Rennie

For ice in water it's true ...

For anything else it depends on the density of the liquid and the body

Mr. Xcoder

Ah I see

John Rennie

09:35

Archimedes' principle is your friend here ...

A floating body displaces its own weight of the liquid

ACuriousMind

@Blue It's not out of the ordinary in the wealthy European countries at all. Also, as a matter of fact, the care for the homeless is around ten times more expensive that just paying their rent(of course, this is only the case if the state cares about the lives of its citizens even if they are homeless. If you just let them die, obviously that's cheaper :P)

Anonymous

@ACuriousMind I'm actually quite pleasantly surprised to hear this. Every government needs to learn something from the European countries. :)

Phase

@Blue Like holding a dumbass singing competition

John Rennie

@Phase the only good thing about Brexit :-)

Phase

@JohnRennie there a few good things, for instance we had a resurgence of Nigel Farage memes

Mr. Xcoder

09:38

@JohnRennie Because $F_a=\rho_lV_sg$ and $F_a = G$ so $\rho_lV_sg=V\rho g\implies \frac{V}{V_s}=\frac{\rho_l}{\rho}\implies \frac{V_s}{V}=\frac{\rho}{\rho_l}$?

John Rennie

@Blue people/societies/countries get more generous as they feel more secure. When day to day life is a struggle it's hard to feel generous. That's just human nature - I'd feel exactly the same.

ACuriousMind

@Phase Even the aliens want in on that!

Mr. Xcoder

And the ratio is roughly equal to 9/10 for ice-water, seems plausible indeed. Thanks

Phase

@ACuriousMind pls don't discriminate against <10k+ users that's a microaggression :'(

ACuriousMind

@JohnRennie It's a feedback loop, though - day to day life becomes less of a struggle if we're generous to each other.

John Rennie

09:40

@Phase ^

Slereah

Mars isn't part of the European Broadcasting Union

Phase

@JohnRennie poor wayward child

@Slereah dont discriminate

Slereah

I'm not, Eurovision is!

ACuriousMind

@Phase Less chatting, more answering!

Phase

@ACuriousMind I'm a physics pleb

Most of the answers I see nowadays I've never studied the background of

John Rennie

09:43

@ACuriousMind it's an interesting one. Decades of US economic policies have fostered a large underclass who basically have nothing to lose and are therefore responsible for a lot of crime. It's hard to see how they recover from this position.

Though to be fair Britain was in a similar state in the Victorian era ...

Phase

@JohnRennie Balarka Sen has control of your mind

John Rennie

@Phase really? Good luck to him then, I wouldn't want to be holding it :-)

Phase

I imagine being in a cult to be quite a nice experience. Intense faith and no doubt you're doing the right thing with your life. riiiight up until you drink the punch and everyone drops like flies.

ACuriousMind

Whoa, where did that come from? Did someone try to recruit you? :P

Phase

Nah JR's response just provoked it : P

Oop better go have a lecture in 13 minutes

Secret

10:07

Fun fact about me:

People who speaks in a condenscending manner to me are known to have this waveform in their voiceprint

(This is the offending waveform repeated a few times of course)

The juxaposition of it with the sawtooth wave is to illustrate that (at least to me) it has the buzz timbre of a sawtooth wave

I will upload a soundcloud for you guys to experience if you are interested

While it is impossible to get an explanation for every single instance in life that makes you unhappy or frustrated and so on, it is at least possible to localise those instance sufficient enough such that they will become so sufficiently explained that you will soon go numb and eventually immune to them

I am that kind of person who will demand even why I felt certain emotions had to be explained in order for them to show up. If I don't understand why I had some emotions, it is possible for me to inhibit them from showing by reason that they are nonsense and invalid

(having said that, anger tends to break through, as well certain artistic emotions)

Secret

10:27

soundcloud.com/user-873168135/sawtooth-like

Emilio Pisanty

@JohnRennie self-deleted within forty seconds?

that's faster than @ACuriousMind

John Rennie

@EmilioPisanty the OP obviously suffered an uncharacteristic attack of sanity :-)

2

Emilio Pisanty

@Phase yeah, it would probably be illegal for landlords to rent homes without working heating

John Rennie

-1

Q: What is the major proof, that quasars are not alien ships?

Suppose Galaxy is full of photonic alien ships. Suppose design of photonic ship is to burn something in combustion camera and send produced light strightly backwards. In this case, we will observe these ships only if their exhaust is pointed directly to Earth. Also, in this case we will see only...

Sigh

More sanity required

Anonymous

10:51

"photonic alien ships"

Anonymous

wtf is that...

Emilio Pisanty

@JohnRennie ::resists temptation to comment with link to Wikipedia article on Occam's razor::

Secret

$$\lim_{x\to 0}\text{Insanity (x)}$$

2

Anonymous

The more surprising fact is that he had managed to get 749 rep points here, and is a member for "5 years, 9 months".

Anonymous

He's probably trolling for fun...lol

Secret

11:00

1

Q: Could a causal mass decrease cause antigravity, i.e. repulsive gravity?

Suppose some mass $M$ is located at rest in some point of space. It creates gravitational potential well, which attracts test bodies towards $M$: Now suppose that the mass of a body drastically decreases several times to $m << M$, for example if the mass is radiated away as gravitational waves...

general-relativity gravity black-holes newtonian-gravity

well, one possibility might be because of the answers that saved the questions from being downvoted

Anonymous

en.wikipedia.org/wiki/Occam%27s_razor comes to mind. — Nephente 46 secs ago

Anonymous

lolol

Emilio Pisanty

@Blue hehehe

@Secret I read the link, though 'that's a question looking for downvotes, went there, and... I had already downvoted =P

@Secret it did get downvoted

+3-2

Secret

I see. My rep is not large enough for me to see vote patterns

Anonymous

There was an app on the Chrome store which lets low rep users see vote patterns

Anonymous

11:06

Don't know if it is still there

ACuriousMind

122

Q: "View Vote totals" without 1000 rep

Screenshot About The vote counts are a great tool to determine whether an answer is disputed or not. Unfortunately, not many of us have enough time to join all Stack Exchange websites and get 1000 reputation. This script unlocks the "View Vote counts" feature for those who are not logge...

script chrome-extensions greasemonkey bookmarklet

Anonymous

Ah, yes

Anonymous

That one

Secret

It's not working for me

0celo7

12:46

@ACuriousMind oh please

0celo7

13:16

@Phase I’m gonna play a little MP3

Adirian

14:06

Hm. This is probably more appropriate to the math exchange, but it looks like logarithms don't play nicely with units?

Or, phrased as a question, is there a way of making logarithms play nicely with units, or do I just have to get rid of the units?

Semiclassical

Yeah, logs really only make sense for dimensionless quantities

So for instance log(a/b) with a, b being lengths would make sense

But log(a)-log(b) doesn’t make a lot of sense

The same can be said about e^x or sin(x), though

Or any polynomial in x which contains at least two terms of different degrees

Adirian

14:28

So, I am looking at sin(log(f(x))), where x is a distance. For this to work, f(x) must be a dimensionless constant. Hm. And something else is going on; there should be a sort of symmetry across scale, such that sin(log(f(x)^z)) should just be a phase-shifted version of sin(log(f(x))), for some specific subset of values of z. The log might already handle that for cases where z is an exponent of the base of the log, inwhichcase I am good, but I need to verify that.

As the speed of light has a sort of symmetry across scale, in that, if you changed every constant in the universe except C such that the universe was a million times smaller, C would still have the same observed value, because seconds and meters would remain in the same proportional relationship. C is an interesting constant.

(Or, phrased more crankishly, if a civilization could exist on the scale of quarks, they would observe the same proportional speed for light)

(Which is more readily apparent if you imagine a civilization whose atomic particles are on the order of scale of our observable universe; they would move proportionally slowly such that the speed of light, across their proportional scales of distance, would appear the same to them as it does to us)

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