The h Bar

Decrypted

00:00

Therefore in a way it seems that space itself does have potential.

Sanya

a potential in physics is conservative and connected to a force

Decrypted

Yes

WillO

Decrypted: Also, time is money and Hell is other people, so time must be like Hell and money must be like other people. Or perhaps the other way around.

Sanya

space does not have that property in any physical theory I'm aware of

Decrypted

If Distance = 0 then what does that say about rate and time?

Sanya

00:02

if a*b = 0 then a=0 or b=0 or a=b=0

Decrypted

Yes

Sanya

that's all there is to it

WillO

Besides which, green is blue plus yellow, whereas 5 is 3 plus 2, so green is very like 5.

Sanya

in a metaphysical way @WillO

Decrypted

Yes

Sanya

00:04

O_O

I'm outta this

I'll leave with another linear law: c = K * p, good old Henry

Decrypted

5 was the addition of the two parts, therefore in similarity greens the addition of the blue and yellow.

WillO

But M=kPY, so c=Y.

er...cY=M, i mean.

Decrypted

So I have no idea about those representations.

Are they open for expression?

Voltage does need space.

That has a connection.

Speed and velocity have a connection.

Instead of looking at whats different, perhaps look at whats the similar.

Sanya

yeah, in english physical standard usage, velocity is a vector and speed is its norm

Decrypted

That is a different of type to a classification that is a similar.

If a man doing pushups moves his body in vector 2 feet three times, adding both up and down the total motion was 6 feet.

A person of a similar rate can walk at the same rate that the man was doing push ups and walk 6 feet.

Still either way 6 feet of space was moved through.

Actually 12 sry

Anyways the points still there.

Well 6 from one perspective and 12 from another.

Never mind I thought it would have been fun to talk to someone interested in it. Bye

Sanya

00:19

O__________________O"""

I will have trouble sleeping tonight

peterh

00:33

It is funny to see, how caffe affects the traffic moral, while the week propagates

David Z

01:03

@EmilioPisanty yeah, makes sense to me.

0celo7

01:37

@WillO so, what do

@Slereah amazon.com/Dynamics-Lorentz-Manifolds-Scot-Adams/dp/9810243820

WillO

@0celo7 Is there more to that thought?

Sir Cumference

02:35

Holy crap

This is an inhibitor protein

Sonic hedgehog

Sonic hedgehog is a protein that in humans is encoded by the SHH ("sonic hedgehog") gene. Both the gene and the protein may also be found notated alternatively as "Shh". Sonic hedgehog is one of three proteins in the mammalian signaling pathway family called hedgehog, the others being desert hedgehog (DHH) and Indian hedgehog (IHH). SHH is the best studied ligand of the hedgehog signaling pathway. It plays a key role in regulating vertebrate organogenesis, such as in the growth of digits on limbs and organization of the brain. Sonic hedgehog is the best established example of a morphogen as defined...

That's awesome

peterh

Question looks good, there is no reaction, but already 2 close votes:

-1

Q: What is your mental intuition of this vector calculus in the context of a point charge (Faraday's Law)?

Context I am struggling to get an intuition about Maxwell's equations. I created this silly mental model. I want to know if it is incorrect. How do other people think about these equations in their minds eye? Assumptions: I have an Electric test charge which I can move in the $x$ direction, ...

This is not the way what made the MathSE great.

0celo7

@WillO What should I do?

The question is so specific I doubt I'll get an answer anywhere

peterh

02:51

@knzhou I will post if I see a significant chance that this question won't be closed. Currently I can't see that.

Bernard Meurer

03:27

@ACuriousMind I need you

WillO

03:51

@0celo7 Are you still there?

Bernard Meurer

@WillO He's up, just poke him enough

@0celo7 Halp

WillO

@0celo7 Hoping you'll see this: MO people get annoyed when you post the same question there and at MSE, especially without announcing that you've done so, because they worry they'll spend time and effort crafting an answer for you without realizing that someone else has already answered you on the other site.

So the usual etiquette is: Wait four or five days after posting on MSE, then post to MO, saying clearly up front that you've already posted on MSE, you've waited a few days, and you haven't got an answer.

But since you're already posted, and since there's already a comment pointing to the cross post, I think you should just ride this one out.

I'm not sure what explains the downvotes. There are no close votes, though.

0celo7

@WillO yes

@BernardMeurer what

@WillO I see

Bernard Meurer

@0celo7 Can you explain topology to me using only emoticons?

0celo7

No

Bernard Meurer

04:05

Then you don't understand it well enough

0celo7

probably

@WillO I got a downvote on that question on MSE, btw

WillO

@0celo7 I cannot explain the downvotes. Maybe people think the answer is obvious. Personally, I don't really understand the question, so I have no opinion.

You lost me at the word "soliton".

0celo7

It probably is obvious and I'm just stupid

WillO

Have you considered offering a bounty?

0celo7

I managed to understand the hairy PDE parts of this book in way less time than this

I'm clearly missing some theorem.

dmckee

04:08

Too soon for that. There is an age requirement.

0celo7

@BernardMeurer topology is just the study of open sets

WillO

It's perfectly possible that it's obvious but you're not stupid.

0celo7

@dmckee It's been two days

Bernard Meurer

@0celo7 No emoticons

0celo7

2

Q: Differential of flow related to gradient Ricci soliton on $S^2$

I'm confused by a claim made in Brendle's Ricci Flow and the Sphere Theorem on page 37. Let $(S^2,g)$ be a gradient Ricci soliton with soliton function $f:S^2\to\Bbb R$. Since the sphere is $2$-dimensional, we have $$\nabla^2f=(\rho-\tfrac{1}{2}s)g,$$ where $\nabla$ is the LC connection, $s$ i...

differential-geometry riemannian-geometry

@WillO The thing has nothing to do with solitons, really

It's just in the title because people who have studied solitons might have come across this specific thing before

WillO

04:09

@0celo7 Of course the downside of that is that people like me who don't know what "soliton" means won't read the question.

0celo7

I guess

What should the title be then

I basically have a vector field and I want to compute the differential of the associated flow

Do you know what that means?

WillO

I can't tell you what the title should be because I don't understand the question. But maybe you should consider stripping it down to the specific point you don't understand, omitting all the context.

0celo7

The context is necessary to construct the vector field though

WillO

Yes, I know what "compute the differential of the flow associated to a vector field" means.

0celo7

@WillO Ok

The question is basically that

All that mess there is me defining the vector field

WillO

04:12

But in a specific case where you're getting a different answer than your book claims?

0celo7

No, I have no Earthly idea how to get what the book claims

I re-read all of the material in Lee SM on flows, and all of the material in Petersen about Killing fields

WillO

And--- there's nobody you can ask face to face?

0celo7

I had a meeting planned with my advisor to talk about my progress in this book but he didn't show

I won't be able to talk to him until next week, and it's doubtful he will know immediately

I sent him an email with a PDF attached that's basically the MSE post

Don't know if he'll bother

The only other person at my school who might know (besides grad students) is the department head, who is a geometer

WillO

Have you thought about emailing the author?

0celo7

@dmckee said to hold off on that.

WillO

04:16

Yah, I can see why.

0celo7

The author is a big name in Ricci flow, and I could see myself working in that area if I go pure math in grad school

he does reference a paper, which does things differently and never needs that result

I checked the references in that paper -- nothing

WillO

Do you feel like you're unable to continue reading until you get this?

0celo7

Yeah. It's not central to the material or anything but it's really bugging me

I could move on if I knew there was a proof out there, at least

But this seems to be original material (?)

And I'm clearly missing something conceptual!

WillO

I think it is commendable to be really bugged by it, but probably wise to try to just move on for the time being.

0celo7

What does the Hessian of $f$ have to do with the flow of $J\mathrm{grad}\,f$!?

WillO

04:20

Especially if you'll be meeting with your advisor before long.

0celo7

I don't think I'll keep reading it anyway. School's about to start

I'd be better off reading Bott & Tu and learning about spectral sequences

WillO

Well, what you're better off reading depends on what you're most eager to understand.

0celo7

And I should do more geometric analysis before I continue reading Brendle anyway, perhaps a careful reading of Petersen would be good

Petersen and Jost

Oh shit the time

I've got to be functional at 9:15 tomorrow

WillO

And (please don't take this as disparaging; it's meant as friendly advice) if you don't know about mapping cones, then there are probably several other things you should master before tackling spectral sequences.

0celo7

Bye

WillO

04:23

bye bye

0celo7

@WillO Bott & Tu does spectral sequences

I haven't gotten that far yet

Maybe they call the mapping cone something different

WillO

Or maybe they just do things in a different order than I would.

0celo7

It should be noted that they don't use the fully general result I asked about in the text.

They use a less powerful one where the horizontal cohomologies are exact except for one term

@WillO AND

I'm flipping through it

They have a proof of this result in there using spectral sequences

So we're good

WillO

oh.....one more thing!

0celo7

ok

WillO

04:28

I do not know who downvoted you or why ---- but people sometimes downvote to express their displeasure with MSE/MO crossposting. So it might be only that, and not the math.

0celo7

Ok, thanks

WillO

Good luck and good night.

0celo7

lost my phone

not good

Secret

05:17

sciencedaily.com/releases/2016/08/160811143216.htm

Lattice inhibit evolution of cooperation. Now the question is, how

sciencedaily.com/releases/2016/08/160810085842.htm

Secret

05:35

Hmm. perhaps we can dress atoms with a variety of properties by allowing a small fraction of its amplitude to exhibit states with those properties

For example, suppose I have some atoms all in the ground state $\lvert A\rangle$. Then suppose I want these atoms to have properties similar to chlorine atoms. This means there should be some probability $bb^*$ the atom should have the electronic structure $\lvert B\rangle$ of a chlorine atom. So with carefully tuned lasers to brought the correct electronic transitions I should be able to generate a state $\lvert K\rangle=a\lvert A\rangle + b\lv…

peterh

@JohnRennie I can't see a reason, why a MO-like PSE site couldn't work. Only the beginning would be hard. I don't think that the theoretical physics were killed because of low traffic. I think, it was killed because the CMs aren't really on the top in anything and they simply couldn't understand, why would 2 physics site needed. On the same reason they had closed the MO, if it had been their decision.

@JohnRennie I don't understand, why would be the culture of the mathematicians and the physicists so different.

Secret

hi.gher.space/forum/viewtopic.php?f=27&t=2086&start=120

Meanwhile the higher space guys are exploring the klein bottle and its twisted generalisations

It seems the klein bottle has symmetry wrt double rotations (i.e. rotating in zw and xy plane simutaneously)

dmckee

05:58

@peterh Then you simply don't know the history of the site. The place started slow and never picked up speed. By the time it was shutdown is was roughly a ghost-town.

That doesn't mean that there couldn't be successful site of that kind, but the first go didn't work.

John Rennie

@peterh I'm afraid you're indulging in wishful thinking. As David says, TP never looked like it was going to achieve critical mass. Psychologists could probably write tomes on why physicists and mathematicians differ - all I can say is that they do.

peterh

07:00

@dmckee As I know, the TP people committed some mistakes. And, at the time, the CMs skills were not yet in the current level. I suspect, in a similar case, something would happen from their side which results to save the site.

@dmckee They collected a much longer community management experience until now. But, they probably can't or won't understand, why would be multiple sites needed. I suspect, if an area51 initiative would happen, they would close it on the reason, that it would take away visitors from an already existing SE site.

@dmckee As I understood their actions: the mods try to hold together a possible largest community in a peaceful way. The CMs try to do the same, but they also control the mods. This whole system tries to minimize the number of the sites and maximize their content. In most cases, it works, but this is an exception.

@JohnRennie As I heard, the TP committed some mistakes, for example they also filtered out high level content (and users), too, on some trumped reasoning. But the MO works well.

John Rennie

Peter, you seem to have a bee in your bonnet about this. TPSE and Physics Overflow didn't work. If you want to set up a new TP site then please do so, but we both know it will fail. For now please give it a rest.

peterh

@JohnRennie Next to the contract between the foundation behind the MO and the SE, there are also other correlations. For example, the existence of the MO plays probably an important role to highten the PR of the SE. While the SE gives continous marketing to the MO. A standalone MO had been probably much less successful, because it hadn't get the countless links and ads from the SE network. I think, this could be the reason of the low traffic of the PO, too.

@JohnRennie I read a lot about the second quantization. Until I've understood, it is based on Fock space, but in the case of interacting fields the things will be extremely complicated. There is also the Feymann's path integral formalism, maybe it is not Fock-based, but I can't understand it now.

John Rennie

07:33

Why do people post this stuff. I just don't understand the mentality...

-1

Q: Higgs Boson theory zero constant

Is Higgs Boson theory a zero constant? There is no relative data to support a Higgs Boson. CERN cannot prove likewise.

special-relativity

Maybe it's just some kid who's nicked his parents laptop.

Secret

Queston one: What is a zero constant
Comment one: Read the cern news

peterh

@JohnRennie Also I not. In my opinion, the close mechanism is for this questions: if they are ready to fix it, they get the option to do so. But, in most cases, they still go away, and the question will be later deleted by the Community bot.

David Z

08:04

This is kind of interesting: "What I learned as a hired consultant to autodidact physicists"

6

John Rennie

Oh you beggar, I was about to post that. We've obviously both just seen it on Facebook :-)

> The majority of my callers are the ones who seek advice for an idea they’ve tried to formalise, unsuccessfully, often for a long time. Many of them are retired or near retirement, typically with a background in engineering or a related industry. All of them are men.

David Z

Twitter, actually, and I've been seeing it for a day or so

but more or less, yeah

John Rennie

Though despite what one might expect, Hossenfelder says many of the callers genuinely want to learn and will take advice as long as it's well explained.

David Z

Yeah, I noticed the stark contrast to my experience elsewhere on the internet (e.g. here)

John Rennie

What she describes is the sort of thing I had in mind when I posted:

1

Q: Chat tutorials?

I recently took a bit of stick for suggesting that the Minkowski metric was an easy way to understand special relativity, and this morning I suspect I've managed to be more confusing than helpful discussing this with Floris. I wonder if this is the sort of issue that site members would be interes...

discussion

Though I wasn't going to charge $50 per hour for it :-)

Slereah

08:30

Oh the AMA is today?

Bass

Interesting. BTW it's $50 per 20 minutes.

John Rennie

@Slereah Yes. IIUC Daniel got summoned to jury service and had to change the date at the last minute.

@Bass $150 per hour! Cor, that's more than I get paid for writing code. Sadly I doubt I have the patience required.

David Z

@JohnRennie I thought that was basically a good idea (and still do), although I would be a little wary of inviting the average autodidact physicist into chat.

I'm inclined to believe Skype, or video chat in general, is a better medium for that kind of consultation than this site would be.

Bass

@JohnRennie Same here :) However, I think you can't compare that to a normal hourly rate. Most likely they won't have three clients per hours.

Secret

What she said is very similar to how I use h bar and I am like a client, except with the difference that my primary aim is trying to understand what we know deeply, understand how the maths translate the physics, and make metaphors that does not deviate much from the actual maths so one can communicate the science accurately to layperson and inspired them to learn more while at the same time make them realise that physics requires serious thinking, rather than trying to build a new model or something

John Rennie

08:36

@Bass True. I get paid by the day i.e. in eight hour chunks so the hourly rate is less than if I was contracting for an hour at a time.

Secret

@Slereah [Scifi] Since you are the time travel guy (although the CTC type), Temporally postponing the issue of the bottleneck, would you mind helping me to check whether this is at least mathematically and logically self consistent and see what other directions I need to consider to further develop it or watch out for? secretuniverse.wikia.com/wiki/Ripple_dynamics

Itachí Uchiha

How can we relate the energy and the radius of a particle in a cyclotron?

Does the radius increases so that frequency remains constant?

John Rennie

Cyclotron or synchrotron?

Itachí Uchiha

Cyclotron

David Z

Gyroradius

The gyroradius (also known as radius of gyration, Larmor radius or cyclotron radius) is the radius of the circular motion of a charged particle in the presence of a uniform magnetic field. In SI units, the gyroradius is given by r g = m v ⊥ | q | ...

Sanya

08:51

@DavidZ although the real scandal is that someone with 15 years of research experience has to bite through on 3months contracts ... f***ing retarded german underfunded system -_-"

or by offering skype consultation lessons

David Z

It's kind of the same everywhere

Sanya

UK seemed better to me to be honest

when I went there for a year; but maybe it's just because I only saw the surface

John Rennie

@ItachíUchiha The Wikipedia article has a pretty good explaantion of this. Have you looked at that article? If so, are there aspects to it that you find unclear?

Sanya

but it's a really interesting article btw, thanks for posting - before I forget that @DavidZ :)

John Rennie

I wonder is Hossenfelder can explain what virtual particles are in 20 minutes. Actually I'd pay $50 for that.

David Z

08:56

It has been going around the internet, I figured it made sense to put it here too. (Anyway, you're welcome.)

@JohnRennie for $50 in 20 minutes, I bet she could explain anything :-P

ACuriousMind

@BernardMeurer For what?

Itachí Uchiha

"It is notable that the cyclotron frequency is independent of the radius and velocity and therefore independent of the particle's energy."
@JohnRennie,velocity can be related to the kinetic energy of the particle but how can radius be related to the energy ?

Sanya

@JohnRennie maybe we should send a PSE excursion team to her office :D

David Z

But seriously though, it's not a stretch to explain virtual particles in 20 minutes to someone like you or me who already knows how QFT basically works.

Explaining it to a layperson or a lower-level student is more of a challenge.

@Sanya What we really should do, someday, is to get her in here for an AMA/chat session.

ACuriousMind

@DavidZ Just need to get the 150$ together and keep Lubos away :P

David Z

08:58

lol

Sanya

@ACuriousMind we could also do the "we are two very interested physics students and we want to come to your office" sketch and see what she replies :D

John Rennie

@ACuriousMind Hmm, $150. I might be willing to stump up $150 for Hossenfelder to do an hours AMA ...

Sanya

@DavidZ well, professors for AMA I can see that it would be cool - but I seriously think most of them will not have the time for that :|

David Z

That's okay, we just invite the ones who do have time.

John Rennie

@ItachíUchiha where does it say that? I don't think it's true. The frequency is $f=qB/2\pi\gamma m$ and $\gamma$ is a function of the particle velocity/energy.

Itachí Uchiha

09:03

@JohnRennie,en.wikipedia.org/wiki/Cyclotron_resonance.The last line.

John Rennie

That's a non-relativistic approximation. For the relativistic treatment look at this section in the Wikipedia article on cyclotrons‌.

Bass

@ACuriousMind Do you think this might be a good question for the main site? Do you know if it has been asked before? Haven't found anything when googling PSE.

ACuriousMind

@Bass Yes. No. :)

What we do have is several questions about why the classical minimum is relevant

First-order corrections, yada yada yada, but I don't think any of those answers your question

Bass

Here you go:

0

Q: Why is a minimum field configuration called a vacuum state in SSB?

Most explanations of Spontaneous Symmetry Breaking (SSB) go like this: They take a scalar field Lagrangian with the "Mexican hat" potential $V(\phi)=−10\phi^2+\phi^4$ and argue that since the potential has an infinite number of possible minima, the QFT has an infinite number of vacuum states (see...

quantum-field-theory vacuum higgs

Unfortunately there's no tag for SSB, so I tagged it with Higgs...

David Z

09:18

We could make a tag for SSB if it would be useful

ACuriousMind

There's probably enough questions about it, yeah

Bass

@DavidZ I think it would be useful, but I have no idea if there are enough questions for it..

David Z

Of course the only way to actually get the tag on to all the relevant questions is to add it manually, by edits

Slereah

I should make some crepes

Bass

If you try to add SSB as a tag, the site shows "gauss-bonnet" with just 6 questions. I think SSB has far more than 6 questions, so yes please :-)

John Rennie

09:30

There would appear be lots of questions that could usefully be tagged SSB

David Z

Of course the actual tag name should be more descriptive than just ssb if possible

ACuriousMind

symmetry-breaking?

Bass

symmetry-breaking exists, but it has no "ssb" alias.. i.e. when entering "ssb", it doesn't appear.

David Z

I'd suggest checking the existing symmetry-breaking questions to see whether they are about spontaneous symmetry breaking specifically

Bass

09:46

Seems about half of the symmetry-breaking questions are explicitly about SSB.

David Z

hmm... spont-symmetry-breaking fits within 25 characters

I'm not the biggest fan of using partial words like that but it's probably better than ssb

John Rennie

spontaneous-symm-breaking ?

David Z

Oh that might be better

0celo7

12:28

@JohnRennie Will you be around from ~1-2 EST?

I'll perform surgery on the PC in that time

Sanya

>! should be a hidden quote/spoiler, right?

0celo7

Nope

ACuriousMind

@Sanya yes

Sanya

@ACuriousMind strange, doesn't work

ACuriousMind

Well, it doesn't work in chat

Sanya

12:30

in a post I am writing

ACuriousMind

But in answers and questions, it should work

Sanya

I get a quote environment with an exclamation mark in front of the text

ACuriousMind

works fine in the preview when I try it

Do you have a space between the > and the !?

Or maybe no space between the ! and the text?

Sanya

neither

I use

>! text

0celo7

@ACuriousMind Morning

I've given up Ricci flow for the time being

ACuriousMind

12:32

@0celo7 heyhey

0celo7

On to more algebraic topology

ACuriousMind

@Sanya Yeah, that works fine in my preview. Why do you want to use a spoiler in a physics answer, anyway?

0celo7

@ACuriousMind How would a north-German say "schön"

ACuriousMind

@0celo7 Huh?

0celo7

How would they pronounce it

Also...why is the trace basis independent

Sanya

12:38

@ACuriousMind I want to include my old wrong answer for reference but I don't want it to immediately show :D anyway, I got the problem - it was line breaks

each line break needs a new >!

0celo7

Oh, it's Trivial

@ACuriousMind According to wiki it would be like "Shane" but I don't know

ACuriousMind

@0celo7 Ah yes, you will find some who'll pronounce it like that

0celo7

@ACuriousMind Got my QM textbook

It's the linear algebra style

Emilio Pisanty

@JohnRennie sp-symmetry-breaking, maybe?

David Z

@Sanya don't do that unless you're using it to demonstrate something about the correct answer, and in that case I still think a quote block is better.

0celo7

12:48

> A typical problem is that, in the absence of equations, they project literal meanings onto words such as ‘grains’ of space-time or particles ‘popping’ in and out of existence.

Emilio Pisanty

If you're going to abbreviate, you might as well go for a single full abbreviation

Sanya

@DavidZ maybe wrong answer is - I mainly misunderstood the question so the old answer does not apply

I can also just take it out

point is, I thought that was unfair

Emilio Pisanty

In the end you should also set up spontaneous-symm-breaking, spont-symmetry-breaking, spontaneous-symmetrybreak and ssb as synonyms to whatever you choose. Then the autocomplete will do the rest.

Sanya

so I wanted to keep it, but I wanted to keep it out of sight

David Z

@Sanya it's in the revision history already

0celo7

12:50

@ACuriousMind I am absolutely garbage at linear algebra. $\mathrm{tr}(A^2)\ge0$, right?

David Z

That's pretty out of sight

ACuriousMind

@0celo7 Not if the matrix is complex

0celo7

@ACuriousMind $\mathfrak{gl}(n,\Bbb R)$

Sanya

@DavidZ it seemed very out of sight to me - well, I removed it

thanks :o

David Z

Cool, thanks. (I assume, because I haven't actually read this answer)

0celo7

12:52

No, it's actually false.

That's highly unfortunate.

@ACuriousMind For antisymmetric matrices things get screwed up

David Z

It's one of our principles that when you edit, you shouldn't keep the history of previous versions of the post in the post itself. That's the reason we have a public revision history, so that anything you've already posted will still be accessible no matter what edits you make. (note: exception for the grace period) That leaves you free to completely strip out anything that isn't going to be helpful to someone reading the post for the first time.

Sanya

ok, yeah, makes sense

Bass

13:17

@0celo7 Did you read about Richard Schoen?

0celo7

@Bass Correct

Bernard Meurer

13:57

@ACuriousMind halp

0celo7

@BernardMeurer I'm pretty sure he's gay, sorry

ACuriousMind

@BernardMeurer With what?

Bernard Meurer

@ACuriousMind I'm going on a date with a german girl today

What should I know?

ACuriousMind

Uhhh...you might want to find someone else to give you advice for that case :D

Bernard Meurer

ffs

Sanya

14:01

You Know You are Dating a GERMAN Woman When...

►

Bernard Meurer

lolwat

@ACuriousMind Come on, you must know something

Sanya

video tutorials ftw

in general, I find some of those things somewhat true :D

Bernard Meurer

@ACuriousMind You can hide it all you want, I know you get so much P. you have the whole alphabet's worth of hepatitis

Lol this video is just too much for me

ACuriousMind

@BernardMeurer lol

Bernard Meurer

Even I have a ridiculousness threshold

John Rennie

14:22

@0celo7 Yes, I think 1 p.m. EST is 17:00 UTC and I'll definitely be here because I'm here for Daniel's AMA from 16:00 to 17:00 UTC.

William Bulmer

Hello

John Rennie

Hi

DanielSank

@BernardMeurer Wait wtf.

How does he know?

William Bulmer

@vzn Thanks. I will take a look

0celo7

14:39

@JohnRennie Ok

Sir Cumference

Due to the expansion of the universe, the proper distance between us and receding objects is increasing, but not comoving distance, right?

John Rennie

@SirCumference Yes

Sir Cumference

Awesome, thanks

Bernard Meurer

@DanielSank He's german, he must know something about German women

Sanya

@BernardMeurer youtube.com/watch?v=S5YmPSbI744 youtube is a real treasure concerning that :D but honestly, I think focusing on her nationality might be a bad idea, given the collective neurosis about being german and thus guilty ... just focus on the person instead

John Rennie

15:05

@BernardMeurer I'm British, and British women remain a mystery to me :-)

0celo7

15:16

@BernardMeurer why don't you ask me

John Rennie

15:36

@0celo7 because your idea of seduction is explaining Czechoslovakian cohomology?

DanielSank

@JohnRennie I once heard a British woman say she was surprised that American men show interest by being friendly.

Apparently the British system involves directing unpleasantness toward the intended. Weird.

Have you tried that?

John Rennie

Daniel I'm 55. My interest has been targetted at just a single woman for a few decades now, and while I still don't understand her she seems willing to live with that fact :-)

vzn

@DanielSank lol sounds like grade or middle school behavior worldwide, ahem uh yes do recall being involved in that long ago :P

Emilio Pisanty

@DanielSank I'm not sure the British system involves unpleasantness, but to be honest after 4+ years in London I was left completely in the dark as to how British babies come to be.

Any of our resident TeXperts around, by any chance?

John Rennie

Wow, an abrupt switch from sex to typesetting

Whatever floats your boat I suppose :-)

DanielSank

15:45

@EmilioPisanty I know things...

Emilio Pisanty

DanielSank

@JohnRennie You mean SeX to TeX, right?

Emilio Pisanty

How do I stop that?

DanielSank

\mbox might work.

\mbox{whatever you want on one line}

Emilio Pisanty

@DanielSank Yeah, that worked =)

thx

DanielSank

15:46

@EmilioPisanty Yay!

2physics

can we ask questions?

David Z

43

Q: How to force LaTeX not to break the line after a hyphen “-”?

With ~ we can enforce that no line break occures between two words. But this does not seem to work with special characters. I want LaTeX to enforce not to break the line after the - in (re-)creation. In my document the line breaks between (re- and )creation, which looks a bit ugly. How can I a...

line-breaking punctuation hyphenation

@2physics sure

vzn

2 days ago, by vzn

@DavidZ Daniel Sank, Phd/ Google quantum computing lab, stackexchange physics guest speaker Aug 12 2016 (announcement/ history, just wrote up)

DanielSank

Haha, yes yes we're coming to that.

Four minutes, dude!

@EmilioPisanty I actually got help at TeX SE on how to make section/subsection/subsubsection headers relative in TeX.

That way, if you import a document fragment into a larger document, the headers all adjust appropriately.

Pretty dope.

vzn

(hi all not sure how many are present/ in the room but would like to know exactly. right bar shows many icons & many clicked on are in less than 1m "seen" status but not sure if they are present. so my hope is that eveyrone here writes a question or something at least once over the whole hour (possibly at end also ok!) so we can see a large audience in the transcript.)

DanielSank

15:58

Present.

::raises hand::

John Rennie

14

Q: August 12 Physics AMA with Daniel Sank: question pool

I am Daniel Sank, guest for the Physics Stack Exchange AMA taking place in the hbar chat room on August 12 at 16:00 UTC [a]. I am looking forward to discussing my experience in the USA physics education system from lower education schools up through the PhD program, my research in experimental qu...

discussion

DanielSank

Ok let's get this show on the road:

Hello, I'm Daniel Sank. I'm a physicist working in experiment quantum information with superconducting qubits. There's some more information about me on the meta post about this AMA.

vzn

DZ do you have an announcement?

David Z

@vzn nope, this is all you

Transcript for