The h Bar

enumaris

12:12 AM

feelin tired

danielunderwood

12:33 AM

Just work on the east coast. Work day has been over for a couple hours!

enumaris

sounds legit

Sir Cumference

1:51 AM

So I guess this is what happens when you have too many equations in a word document

Actually it seems all my notes from old classes went poof

Sigh this program is awful

Secret

11:11 AM

sciencedaily.com/releases/2018/12/181205133939.htm

CoSINE-18's initial result cannot found the annual DAMA signal

Captain Bohemian

11:33 AM

what's the meaning of adding the gravitational Chern-Simons term to a gravitational Lagrangian? Does that make the gravitational theory become massive or make it equivalent to the theory of gravitation in the presence of matter?

Avnish Kabaj

1:14 PM

I have also a paper afloat, with an electromagnetic theory of light, which, till I am convinced to the contrary, I hold to be great guns.

bolbteppa

1:28 PM

@Slereah This sciencedirect.com/science/article/pii/0370157374900313 is very similar to the cool Scherk paper

Slereah

3:25 PM

that whole article on negative mass fluid is like

a bit late to the party

since that kind of theory was developped in the 90's

vzn

4:56 PM

@Slereah what prior theory are you referring to? just because its old doesnt mean its all wrong, some ideas get recycled/ revived on later review/ new findings/ ideas/ angles etc... also maybe (presumably) its cited somewhere in the new theory...

enumaris

5:12 PM

brrrr cold today

Semiclassical

reminds me, i need to walk over to get lunch eventually

for reference, this is the relevant preprint

glancing through it, i'm not seeing a connection to work in the 90s. i could easily be missing it tho

enumaris

negative mass fluid it is!

Dark matter and Dark Energy conundrum solved!

wow!

Slereah

5:28 PM

Oh look, vzn has to come to the rescue of obscure theories

I'm not saying it's wrong

I'm saying it is weird seeing it presented as news

enumaris

5:45 PM

pain

Physics Meta

6:04 PM

-1

Q: Why does The 'physics' tag is not allowed?

Why does The 'physics' tag is not allowed!? Oops! Your question couldn't be submitted because: The 'physics' tag is not allowed. Creating the new tag 'physics' requires at least 1000 reputation. Try something from the existing tags list instead. New tags cannot be created from the mobile si...

enumaris

6:25 PM

not much to do today...they should put a nap room here so I can just take a nap lol

Loong

Here, it's a public holiday today.

The TV shows the president shaking hands since one hour or so.

bolbteppa

7:56 PM

@vzn fluid TOE lol

danielunderwood

ew I don't want my toe to be fluid

bolbteppa

Neither does nature apparently :p

vzn

@danielunderwood join the club™ :P

enumaris

a theory for dark matter and dark energy is not synonymous with a TOE unfortunately

vzn

@bolbteppa wrong :P

danielunderwood

7:58 PM

Silly physicists only trying to describe nature's toe!

At least try both toes

I think the way we have dark energy is actually
Einstein: Here nature, you need this extra term
Nature: Uh, ok sure

bolbteppa

@vzn eng/astro department runs

@vzn What if negative mass in GR is the analogue of anti-particles in RQM :o

danielunderwood

> IS THE GRAVITATIONAL FIELD AN ILLUSION, A BY-PRODUCT OF GEOMETRY

Did a nutty to yes 180 real quick there

Well more of a yes*

enumaris

yarp

danielunderwood

Illusion + Caps = Bad

Wow people don't mess around. I had an interview this morning and got a call back an hour later

Physics Meta

8:35 PM

0

Q: Where to ask for a software recommendation about light refraction in a 3D media?

I'm want to simulate and visualize (render) how would light refract inside a glass mug with complex geometry. Since I'm quite sure I cannot code myself something like that, I would ask for a software recommendation. However, it seems that such questions not allowed here. Where can I ask for a so...

support

enumaris

8:52 PM

an hour

was it good news?

danielunderwood

On to the next stage I go

enumaris

nice nice

got an interview with a pharm company in NY

danielunderwood

But the next stage is a meeting with the team, which is in a different country. Right as I'm getting my passport renewed

enumaris

one that I applied to and was rejected from last year (after a panel interview)

oof

but if you are already on the personal meeting stage, that's pretty much already sealed deal then

most of the personal meetings are like "let me just make sure you're not a psychopath"

danielunderwood

Yeah that's pretty much what it sounded like

And nice! Have you been looking at NY jobs in general?

enumaris

9:00 PM

not particularly

they gotta pay me big bux for me to want to move to NY lol

I'm not putting too much hope into this one

The start up in San Fran that I interviewed for last Friday seemed very interesting. The interview went very well, and the person said she'd like to go to next round interviews...but then I haven't heard anything back so now I am beginning to doubt lol.

maybe they found someone better and decided I'm no longer worth talking to XD

danielunderwood

I quite like the responsiveness of this company I'm interviewing with. I've heard back within an hour from every interview

enumaris

nice nice

it's a remote work situation or something though?

vzn

@enumaris am aware of that, was being semi )( facetious about the TOE, however physics is overcompartmentalized right now and the fluid paradigm is more crosscutting than anyone currently realizes, the latest announcement is supportive evidence of that...

danielunderwood

Nah they have an office near me where they're going to be building a team, but what exists of the team is in Canada

bolbteppa

9:16 PM

@vzn there is no such thing haha

vzn

@%&# disappearing lines, cant even talk about Physics around here >:(

Mostafa

@enumaris Was your phd in theoretical or experimental physics?

bolbteppa

A fluid is made up of particles

vzn

@bolbteppa you raised that, we discussed it before. agreed all known fluids are made out of particles. however there is a lot of fluid dynamics behavior now observed in LHC like experiments that is not exactly particle based. and insisting all fluids be made out of particles reminds me of the (historical) rejection of the atomic/ photon hypotheses.

bolbteppa

@vzn you mean the particles exhibit field like characteristics, as in quantum field theory behavior?

vzn

9:22 PM

have cited this before, eg cf quark gluon plasma/ new findings phys.org/news/…

bolbteppa

There is something particularly egregious about calling 'fluid paradigm's fundamental when they are derived using thermodynamical relations - thermodynamics/statistical - mechanics is about average behavior, it's simply laughable to think this is 'fundamental' in the way relativistic qft is fundamental

Semiclassical

> “When I use a word,” Humpty Dumpty said, in rather a scornful tone, “it means just what I choose it to mean—neither more nor less.”

vzn

@bolbteppa (agreed its hard to wrap ones brain around but...) its possible to have a non particle based fluid. ie spacetime fabric

bolbteppa

@vzn so spacetime is made up of particles absolutely everywhere?

Semiclassical

If you can't actually write down equations for what you mean, I don't really trust what you mean.

bolbteppa

9:25 PM

Unless spacetime is made up of a bunch of particles you can't call it a fluid

vzn

@Semiclassical the eqns are written, still no reason to trust them eh? :P

rob

@bolbteppa I think the statistical nature of thermodynamics makes it more fundamental than any particular microscopic model of nature, because you'll end up with the same results for large-scale system regardless of the microscopic details.

Semiclassical

Oh, I'm sure there are people who have written such equations

It's just that that group of people doesn't include you.

rob

Let's be kind to each other, friends.

3

bolbteppa

@rob not sure what you mean, equilibrium statistical mechanics is about replacing the quantum mechanical density matrix with a probability distribution encoding average properties, how is it more fundamental to neglect tons of information?

vzn

9:29 PM

@bolbteppa eg think of navier stokes eqns, they have no ref to particles. theres no proof that they require particles. there are many other examples of this eg soliton dynamics etc

bolbteppa

My sense is non-eq stat mech is not fully formulated because no 100% perfect way is known to replace the insane density matrix by something simpler, not sure about that though

enumaris

@danielunderwood I see

@Mostafa theoretical

vzn

lol "insane density matrix"... o_O

rob

@bolbteppa I found a nice comment a few years ago to the effect that the entire point of a physical theory is to reduce the complexity of the information needed to predict observations.

Thermodynamics does this in spades.

But "fundamental" doesn't feel like quite the right word for it. I'll have to think about a better one.

bolbteppa

@vzn Navier-Stokes apply to classical non-relativistic fluids, derived from F = ma, things are way more complicated than just hoping everything is ruled by fluids man

vzn

9:33 PM

@bolbteppa ofc its complicated. complicated fluid dynamics... oxford phd(s) agree :P

Semiclassical

well, tbf, you could take the attitude that a Navier-Stokes fluid is an entity which behaves according to the Navier-Stokes equations

and not worry about whether it has a derivation from some microscopic newtonian mechanics

the real problem is that fluids don't behave according to the Navier-Stokes equation all the way down

vzn

some glimmer out of the box thinking there

bolbteppa

@rob Yeah but as far as I know there is tons of work going into delving into the initial approximation, e.g. using field theory methods, and condensed matter deals with places the initial approximation fails etc, fun stuff

Semiclassical

in which case the fluid description is emergent and not fundamental to that system. still bloody useful, but the microscopic physics isn't the same

@bolbteppa keldysh formalism and all that, yeah

stuff my phd advisor knows well and I don't

bolbteppa

@Semiclassical yeah I really have no idea about this stuff, or condensed matter :\

enumaris

9:37 PM

hue hue hue

Semiclassical

@bolbteppa my advisor literally wrote the book (well, a book) on this stuff: books.google.com/…

vzn

@bolbteppa do you want a GUT/ TOE or not? many seem to reject all candidates. fair enough! hossenfelder ("the iconoclast/ contrarian") is actually roughly in that camp. ps just read her garrett lisi chapter/ vignette, think you should read it just for fun, shes a funny writer, almost like a standup comic sometimes... :)

bolbteppa

9:58 PM

@vzn string/M theory

@Semiclassical yikes

Semiclassical

i don't really care about TOE/GUT stuff myself, as is probably clear

bolbteppa

@Semiclassical If I ever get to this

amazon.com/Statistical-Physics-Theory-Condensed-State-ebook/dp/…

then maybe I'll have a sense of what's going on with condensed matter :\

@vzn there's a (many a) reason why people have been studying this thing for nearly 50 years now compared with e.g. fluid paradigms

vzn

@bolbteppa fluid dynamics pervades existing theories without anyone fully realizing it.

bolbteppa

@vzn fluid dynamics is it's own subtheory, you probably mean 'field' theories

vzn

@bolbteppa field theories have strong fluid dynamical aspects. etc ... its all just lying around waiting for the next Einstein :P

bolbteppa

10:11 PM

@vzn they all use the same vector calculus math

In multivariable calculus you call these functions "scalar/vector fields"

vzn

@bolbteppa yes + obviously its deeper than that.

bolbteppa

You're trying to conflate things

vzn

@bolbteppa youre trying to compartmentalize them :P & theres a big history/ crowd for that! o_O

bolbteppa

The fluid paradigm stuff is based off actual fluid mechanics concepts which depend on deeper things and completely fail outside of their domain

There is really no difference between what you're saying and someone saying the "gas paradigm"

vzn

@bolbteppa you miss 100% of the shots you dont take —wayne gretsky

bolbteppa

10:14 PM

We can view everything as a bunch of gases too by this logic

Heck why not solid mechanics

vzn

@bolbteppa so whats the answer then bolbteppa?

bolbteppa

@vzn the answer is the only hope is string/m theory

The Elegant Universe Part 1 Einstein's Dream

►

vzn

@bolbteppa lol yeah right. ed witten will save us! seriously though there is some connection between string theory + fluid dynamics :)

bolbteppa

The presenter is also an Oxford PhD

haha

enumaris

string theory, you're our only hope

vzn

10:16 PM

lol! alas carrie fisher is dead now o_O

bolbteppa

@vzn fluid mechanics is a bunch of useful approximations

There is no final 'quantum fluid mechanics' yet, you're literally calling classical mechanics the TOE when you bring up this fluid paradigm stuff

vzn

just found a whole bunch of juicy string theory + fluids refs. have already cited some in my blog...

enumaris

Sheldon and Amy, you guys can stop arguing now

bolbteppa

haha

Semiclassical

my version of that would be more profane

vzn

10:23 PM

lol ok. do something else instead :P cinemablend.com/television/2455287/…

enumaris

10:49 PM

finished reading the 3 papers I was assigned to read...I gotta find something more to do lol

whoop got another interview lined up

back to 4 total (theoretically)

danielunderwood

Were you assigned to read them for job interviews?

enumaris

nope

as part of my job lol

some case studies in how "conversational AI" is used in healthcare

It's not really AI though if you ask me...more like...custom and partly interactive text messages

danielunderwood

11:04 PM

Nope all technology today is AI

"If it was written in Python, it's probably machine learning. If it's written in PowerPoint, it's probably AI." - Some guy on twitter

enumaris

sounds legit

danielunderwood

Well of course. Twitter is the source for legit info!

enumaris

has an aneurysm

the role that I'm interviewing for's salary is a bit low though...not super excited about that one...

danielunderwood

11:21 PM

The one that I interviewed today asked and I said a number that was probably a bit low...oops

enumaris

gotta start off high bro

Physics Meta

11:51 PM

0

Q: Why was my question about Quantum Mechanics and FTL drives put on hold?

So, I just asked a question (FTL drives and Quantum Mechanics experiments) about the intersection of quantum mechanics, FTL drives, and some form of relativity (not sure if it's general or special), and it got put on hold for "no questions about non-mainstream physics". But relativity, FTL drive...

discussion

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