like @0celo7 I guess.

@0celo7 Here is a more mathematical way of saying (part of) what Lanczos describes: books.google.ie/…

and I think addresses exactly what your post said about freefall

You see he says they give potential energy a geometric origin

@0537 I don't think thats a good reason to quit physics but if you're happy then cool :)

@bolbteppa thanks I'll take a look at it

@FenderLesPaul Hmm, I got a VTC on my wave question as "unclear"

@bolbteppa : gravitational potential energy is internal kinetic energy. When you drop a brick gravity converts some of this internal kinetic energy into external kinetic energy. It's pretty simple if you think about the wave nature of matter. Check out the mass deficit and remember the mass of a body is a measure of its energy-content.

@0celo7 : LOL, the VTC was me having a laugh. Sorry, I couldn't resist.

Hi @ChrisWhite how goes the job hunting?

Retracted!

@ChrisWhite That's some dark shit.

@ChrisWhite :'(

@ChrisWhite I don't mean to be rude, but is your resume "thin" compared to your peers or something

@ChrisWhite sigh

I didn't really want to.

Also, I keep on sighing

I should cut it out :P

How have you been, @ChrisWhite

Besides anxious for responses to your applications

:\

But you're at friggin Princeton

That's like a solid +9000 right there.

if only it was +9001

I was hoping his own qualities would carry him over the legendary barrier.

Are you applying only to very prestigious unis?

Do tell!

Exploding offers?!

Sounds explosive.

Hahaha, that's crrrazy!

You're lucky to be in such a position of relative power.

Pfffft :P

Or just get hired at some R&D company...

Program WMDs or something

I bet there's good money in that.

^

just teach physics at my high school

I just got a raise this week

you'll earn a shitload of money really fast

Yes. Imagine the awesome Senate hearings

"Dr. White, you want to turn the moon into a black hole and destroy the commies?"

"Why has no one thought of this before??"

@Huy That's the first time I've heard of a high school teaching job being lucrative.

@HDE226868 Cheese and watch land.

@HDE as everyone who's talking to me and doesn't live in Switzerland

@ChrisWhite Okay, wow.

@ChrisWhite Go to AL

@HDE Even before you have any degree apart from your high school degree, your annual pay would start at around $85k.

My only exposure is in my immediate district, where the teachers are paid crappily, even if they have doctorates.

@HDE226868 Never met an American teacher who had a PhD

Never even heard of it

Congrats, you're my TIL of the day

@ChrisWhite ...or the white children committing crimes.

(besides drugs)

@0celo7: Actually, my physics teacher was subbed by a Princeton PhD for about half a year.

@0celo7 I go to a STEM school, so the administration is eager to get good teachers. They're not too keen to raise their salaries.

@Huy AMERICA

@HDE226868 Sigh, we've been over this

I went to a "STEM" school as well

brb, food and stuff

@0celo7 I know. I'm not a good example of normal.

@HDE226868 yeah you do PhD astrophysics

freaking ZFC stars and shit

@ChrisWhite I want to say that that's cynical, but I do know parents like that.

@0celo7 What?

I have no idea what you're talking about. TZOs?

You once said there's good money in tutoring rich kids.

there is

Do it.

teaching an actual HS class is more fun, to me at least

I did the other thing too, before.

@Huy Oh, right, I forgot about that.

@ChrisWhite: While I do like being able to focus on just one student at a time, it's just a very different atmosphere in a class, and the latter I like much more for some reason.

It's more social :-)

@ChrisWhite So scary :(

Do you play chess?

@ChrisWhite Is that at super-elite schools in small fields

Because that's not the feeling I get from my profs/school

@skillpatrol eww

@0celo7: just stumbled across this

such truth

sigh

how does one confront a non SJW about her SWJ bestie

not before you have a very good relation with her, and even then it's very difficult

should just let her figure out herself, imo. will happen sooner or later, or she'll turn into a SJW herself, in which case telling her about it would have only made things worse, @0celo7

Waiting for grad schools for another 2 months is torture

@FenderLesPaul simple: don't go to grad school

ill starve though

no?

Love will keep us alive.

become a rock star

@skillpatrol that's a load of šit

Love is a lie.

@FenderLesPaul wtf you said you loved me

you're an anomaly

chiral?

wait don't the anomalies cancel in a consistent theory

conformal

this implies you have a mistress

egasp

@FenderLesPaul get your CFT outta here

CFT <3

Love is a removable singularity

literally the worst field theory

right behind QFT

the only good field theory is Maxwell EM

what about GR

@FenderLesPaul hmm, should I stream ME3? I haven't done that in months

@FenderLesPaul ill defined

yeah if you stream I'll watch

barstoolsports.com/barstoolu/…

@FenderLesPaul smh

wtf I want Gen. Tso chicken in the dining hall

exactly

@FenderLesPaul well I'm playing ME3 anyway

might as well

@FenderLesPaul hmm, I'm half the world away from my server

this might be an issue

try it anyways

twitch.tv/revolver_0celo7

working on it, @FenderLesPaul

have to relearn how to use this software

tis blank

no it's working.

is it

it is!

is the audio working?

not for me

the audio button is broken for me.

Lemme know what happens when the game loads

I have audio on my end

Twitch audio

no audio

Hey, no ACM today?

oh nvm

its working now

@FenderLesPaul I'm doing the Leviathan DLC

gotcha

@FenderLesPaul how does an organic quantum entanglement communication system work

@JohnDuffield gravitational potential energy is an approximation to a general relativistic term expressing curvature of spacetime, and kinetic energy is an approximation to a term representing motion through the geometry of that spacetime, what you said makes no sense sadly

@kevinTahN. ::mumbles something about representations of Spin(n)::

@0celo7 ah yes, can you throw in some pdf link I could look at? something super simple for me :D

@kevinTahN. nope

not off the top of my head, sorry

@ACuriousMind this Leviathan stuff makes no sense

wtf is the Catalyst, given what we know about the Reapers from Leviathan

@0celo7 that sounds like some vegan conspiracy theory

has anyone here attempted to learn loop quantum gravity?

were I younger I'd probably learn it for the sake of learning it because it looks so cool but now I'd rather only attempt to learn it if I was going to get something out of it that I could use for more mainstream physics

This motls.blogspot.com/2004/10/… scared me away from LQG

I appreciate the link but it would take a lot of alcohol for me to take anything Lubos says in his blog seriously

Why is that?

@FenderLesPaul Lubos is pretty much the best physicist

he's about as close to a demagogue as I've seen in physics literature

Maybe LQG is right for you then if you think generalizations like that are fair game

he's very narrow minded and clearly doesn't actually make valid arguments

have you seen his posts about why string theory HAS to be the correct theory?

they're laughable at best

I agree he is a demagogue and an ideologue and very right wing and all that, but his discussions on physics are so insightful at times

Still 1600 short for the best ending

@FenderLesPaul no

link?

the very first line of that link is "too many assumptions"

lmfaoo

coming from a string theorist that's pretty funny

@0celo7 I gotcha one sec

@FenderLesPaul pls string theory assumes nothing

second answer

it's so laughably bad

He says too many assumptions and then gives reasons why this is so but you ignore his reasons and go for character assassination, this is typical of people who write him off, but sure it's easier to just paint with broad strokes than address facts

::assassinates::

ok well

@FenderLesPaul pls how do I get 3100 EMS in this game

his first claim

"It assumes that the metric tensor is a good variable at all distance scales, and it is the only relevant variable."

it's not possible

is already wrong

because LQG doesn't use the metric tensor as its dynamical variable

it uses Ashtekar variables which involve veilbeins and connections

@FenderLesPaul what

that's not in that answer you posted

obviously quantization using the metric tensor won't work that's WHY Ashtekar reformulated GR using the connection and veilbein instead

@0celo7 I was referring to the blog link from earlier

"It even assumes that Einstein's equations are more or less exact in the Planckian regime."

A veilbein is just a change of variables so that the metric tensor is diagonal, and a connection just connects things at varying points?

@FenderLesPaul >veil

@bolbteppa ??

there's a huge difference between quantization that uses $h_{ab}$ and $\pi_{ab}$ and quantization that uses Ashtekar variables

otherwise Wheeler would've figured out how to canonically quantize gravity a long time ago

These are just mathematical tricks, they don't involve any physics

and what is your basis for that?

Basic math?

lol ok

good for you then

A connection is just a way to express the derivative of a basis vector in terms of the original basis

I don't think you understand how canonical quantization of gravity using ADM variables vs Ashtekar variables actually works

you're just throwing out basic definitions

@bolbteppa I don't think a differential geometer would approve

The whole point of modern physics is to phrase it in a coordinate-independent manner, a connection is one way of doing that (properly set up) if they are quantizing using certain variables that's fine, the question is what are they quantizing to begin with and why is that justified

this has nothing to do with coordinate independence

people already knew after the ADM formulation came out that canonical quantization using ADM variables would not lead to a proper theory of quantum gravity

So what should be quantized?

and why?

First off, the idea of certain variables affecting the physics is just flawed to begin with, but Lubos mentions another flaw with the variables in that link

@kevinTahN. well it depends on whether or not you want to do canonical quantization

So what is the deal with LQG? He seems to imply that they take the Einstein equations as fundamental and just quantize them right?

if you do then one option is the old LQG option of using the veilbein and connection instead of the 3-metric and associated conjugate momentum

or you can go the particle physics route, which in many ways is far better motivated

as Ed Witten explains in one of his talks, by coming up with a quantum gravity theory that is dual to a CFT which is basically string theory

@bolbteppa I do believe so

at least at a basic level

Naively that sounds nice, and I would impulsively think to do something like that

don't get me wrong I would never take LQG seriously as the end all be all theory

and in my opinion string theory has much more going for it in many respects

I was just wondering if learning LQG would offer more conceptual insights into GR

But he makes a really good point that since GR is a classical theory those equations are really just effective field equations to something that requires corrections

certainly that point is hard to argue with

Carlo Rovelli I think had a counter-argument that if you believe in gravity just as another "gauge theory" then that argument would work but that you should also remember GR has important ramifications for space-time

so a quantum theory of gravity should incorporate these (e.g. background independence)

which I don't think is really a counter-argument against LQG but more so an argument that string theory still doesn't have a background independent formulation

and even worse he says that you have to start denying special relativity and that the path integral breaks unitarity, I'm worried about picking up bad ways of thinking from learning this stuff, though I will learn the details in the future - maybe semi-classical quantum field theory in curved spaces is what you're really asking about?

books.google.com/…

there's the statement I was talking about

I don't really agree with it but there it is for completeness

@bolbteppa yeah I've never really understood how lorentz invariance works in LQG but no QFT in curved spacetime isn't exactly what I had in mind I was just wondering if LQG had a way of offering more conceptual insight into GR as I was looking to refine my understanding of the more fundamental aspects of GR

and these LQG books seemed to spend some time on these philosophical aspects so I was wondering if that would be a viable venue

maybe a book straight up on the philosophy of GR would be better?

@FenderLesPaul fuck that

:p

Okay cool, maybe chapter 32 of Penrose's Road book might help you

oh cool, I'll check that out :)

what I'm really trying to say is

"32 - Einstein’s narrower path; loop variables"

it's winter break and I'm bored as fuck

Twistor theory might be better

From what I gather, LQG is harder to learn than string theory lol

ooh this chapter looks cool thanks @bolbteppa

@kevinTahN. if that's true I'd gather it's because far more people work in string theory and there are way more textbooks on it

but the textbooks on ST are all terrible

I think polchinski is alright

BBS is all over the place

but it has worked problems!

I'm trying to understand why Zwiebach gives you the equations of motion of a string in chapter 6 then does random stuff for 2 and a half chapters before kind of getting back to normal

but also I'm not too into string theory in and of itself

I like general aspects of quantum gravity like AdS/CFT far more

plus I still have to stumble through Weinberg :p

one day!

oO It's @FenderLesPaul!

yo I'm not a zombie anymore

Welcome back!

@ACuriousMind wow you're never that excited to see me

how on Earth did you get 2800 EMS...

@0celo7 If you ever left this room for a significant amount of time, I might :P

Greeting you when I find a chat ping from you in my inbox when I log on more often than not seems a bit pointless ;)

There have been some great texts like zee's text that reduces field theory to a much simpler calculus problem then builds back up, or a text that reduces may be renormalization and renormalization group to simple integral and then puts back physics step by step. Is there a string theory book that takes this approach. I have been secretly wanting to understand string g

theory but have found most text indigestible. I really love texts that simplify the problem to a baby math problem, then discuss all the aspects of the real thing before bringing back the real thing

@kevinTahN. "baby string theory" is probably learning standard QFT and conformal field theory in isolation :P

@kevinTahN. Zwiebach, plus there are videos along with the book

But yeah I agree, cft was just so hard too, especially when you learn it and not see why it's similar to qft

@ACuriousMind any baby cft a la description I mentioned aka baby math first ?

@bolbteppa videos?

@ACuriousMind Thanks!

@ACuriousMind I do

yeah is there a cft without physics text I can look at? something with super elementary math rational with all the features of cft? then introduce cft with the physics? Just like Zee started with a stupid simple integral?

@ACuriousMind be honored

@kevinTahN. I honestly don't know what you expect. CFT without physics might be representation theory of the Virasoro algebra, but that certainly not easy.

2465 EMS

::wipes brow::

You might try David Tong's CFT notes

how is this even possible to get more

but no I don't think anything like that exists

@FenderLesPaul lies he has no CFT notes

well basically chapter 4 of

damtp.cam.ac.uk/user/tong/string/string.pdf

@kevinTahN. perimeterinstitute.ca/training/perimeter-scholars-international/… has videos paralleling Zwiebach

Under the review tab

@ACuriousMind I even learning virasoro algebra without knowing about its classical Witt algebra companioi or its more mathematical root can make it a bit esoteric lol

cft is not to be trifled with

lol

Such a nightmare at times

@FenderLesPaul you are the man lol

@FenderLesPaul nice. . . pretty much all of the physics without the physics lol

@kevinTahN. ah, that's a Riemannian geometry textbook

@0celo7 lol yup :~)

@kevinTahN. The Virasoro algebra just appears as the central extension of the Witt algebra because central extensions are those who correspond to projective representations...but, really, at some point you can't expect that there is some "simple" thing you can take as a model for the theory, because advanced theories are precisely for those cases where the simpler models don't work.

@ACuriousMind suppose the Reapers found me in a system where there's a lot of loot

how do I get back in without them crawling up my @ss again

sexy

@ACuriousMind I agree , in most cases that is true, but there is folk lore about super amazing advisors who can reduce any advanced theory into a simple calculus problem of arithmetic lol

@FenderLesPaul I do have a thing for multiple...appendages

@kevinTahN. you should teach yourself how to do that

@bolbteppa that is what I have been doing lol

Nice, what is your favourite example?

...why does every of your statements end in "lol"?

I love lol

lol

@ACuriousMind because you won't tell me how to evade reapers lol