The h Bar

2:18 AM

in Mathematics, 5 mins ago, by idk

Anyone explain why 1+1=1?

While this case is actually posted by a troll, as notified by Akiva and many others

A distributive algebra where the multiplicative identity is idempotent is one of the most trivial mathematical structure in existence that is not the trivial structure

in Mathematics, 3 mins ago, by idk

What? In which aspects am I trolling? (I am... shhh) I am simply asking for help.

This is why sometimes it is not easy for me to spot trolling, because my preference of weirdness means I have explored quite a few statements seriously that trolls just happened to like to use because most people will identify it as nonsense

while they are not when given the correct context

They are mostly not very interesting though

4:20 AM

@North should i just answer it lol

5:33 AM

@EmilioPisanty Check this shit out

Vivek

5:55 AM

@dmckee Yes it has been deleted, but I didn't delete it. Now that question can't be undeleted anymore?

dmckee

@Vivek Sure it can be un-deleted in principle, but it was roomba-ed so there isn't in impetus to do so. Again, the mods don't generally intervene in the normal function of site processes.

HsMjstyMstdn

6:13 AM

I scent the sanctitude of rigour being defiled !

@Vivek I think in this case it's probably better to just repost the question. The way you have it after your latest edit is just fine except for two things: (1) give it the homework-and-exercises tag, and (2) you can leave off the last sentence where you link to your work on the problem because it's not relevant to the question you're asking.

Okay, I am done customizing

@DavidZ @EmilioPisanty Tell me this isn't BEAUTIFUL

If you're going for beautiful I liked the first picture better =)

But yeah, as terminals go, it looks really nice.

HsMjstyMstdn

Agreed

@DavidZ There's no real difference, this one just has me actually working in it :P

6:23 AM

For some reason I've always preferred black text on a white background.

@JohnRennie HERESY

I can't stand white terminals after a while

I spend the whole day looking at it, so it better be nice and dim

One of the first things I do when I log into a new computer is to change the command prompt colours to black on white.

I use a colorscheme I stole from a friend

And changed the yellows a bit

@JohnRennie How do you look at that all day?

My whole scheme is basically black text ona light background

Holy fucking shit

You're absolutely crazy

LOOK AT THOSE ICONS SPREAD ALL OVER

OH MY GOOOOOOD

I need a beer and a cigarette

I like that NoteZ app on the left tho

props

6:29 AM

The icons carefully placed round the edge are permanent, while the ones scattered in the middle are (in theory) temporary.

@JohnRennie haha :)

Unusual, but if your eyes can take it, why not

@JohnRennie I disable icons on the desktop on every computer I touch

Ah, well, the difference between us is that I got over my OCD :-)

Lol

@JohnRennie This reminds me

I wrote a test framework for C99

github.com/bemeurer/zuul

asciinema.org/a/0WyeNeFC5Ma3bS9uOEnTJPefY

Demo ^

All it needs is an ANSI terminal and POSIX

No macros, no magic

I'm rewriting the API for 1.0

Back in a mo. Got a dead server ...

6:44 AM

@JohnRennie .. can you please explain me why does time period required to travel in an orbit closer to earth more than that required in an orbit farther from earth...? Which is why fuel consumption by aeroplanes at higher level is less...

The fuel consumption of airplanes is lower at high altitude because the air is thinner and aerodynamic drag is lower.

It has nothing to do with orbital periods.

What about the time period case ?

I mean ... without the aeroplane fact...

You should be able to derive the equation for the period of a circular orbit. I can through it if you want.

I know the equation ...But I want to know the cause why time period is slower ...

Any conceptual thought or idea ?

One is $v=\frac{GM}{R+h}$...

The time period is smaller for a lower orbit. That's for two reasons. Firstly the orbital velocity increases as you move to a lower orbit, and secondly the distance you have to travel is smaller.

6:50 AM

But I've encountered in my book that a satellite apraoching in a closer orbit to the earth has to cover a larger distance...

@NehalSamee I'd need to see what the book says. If the orbit is circular then obviously the circumference of the orbit is $2 \pi r$, where $r$ is the distance from the centre of the Earth, so it decreases as $r$ decreases.

I'm also thinking that way...

But I've figured out one thing whether right or wrong don't know...

$v=\sqrt{2g(R+h)}$...So, as R+h decreases , v decreases...So , Y increases...Whereas it gives opposite result for $v=\sqrt\frac{GM}{R+h}$

I believe that last equation is wrong. (The units don't work, at least.)

7:10 AM

Don't listen to him, units don't mean anything

(Don't listen to me)

But ive derived it from the first one...@DavidZ

You must not have derived it correctly, then.

Btw...Units work...

G=Nm²kg^{-2}...

Oh, wait, that's right. My mistake.

M=kg and R+h=m...

7:19 AM

The problem is actually that $g$ depends on $R + h$.

So the first one is appropriate for consideration...?

What do you mean by "appropriate for consideration"?

Is there anyway to prove F = q(vxB) or is it a law like coulomb's law?

F = BiL on a wire was derived from that, so I don't think manipulating that will be a proof

@Rick Well, what would be your starting point? I.e. what do you have available to use in proving it?

@DavidZ..."consideration" regarding the topic discussed with John Rennie e little bit earlier by me 😊

7:35 AM

In that case maybe I'd better leave this for John to follow up on with you, since he has the proper context to discuss it

I'm not sure...most books just define it as such

@Rick Ah, well in that case, presumably the proof would use whatever has been introduced in the book up to that point, or whatever prior knowledge the reader is assumed to have.

Ultimately all these things come down to experiment, though.

Ok

8:39 AM

@NehalSamee I'm back now if you want to carry on discussing orbits

8:51 AM

It is a beautiful morning in Wookey Hole

Muddy though. And since this is a dairy farming area the mud is ... err ... well .... not just aluminosilicates.

2

9:36 AM

@Rick you can derive the Lorentz force law $F = q(E + v \times B)$ as the Euler-Lagrange equation for a relativistic particle coupled to an electromagnetic potential, using basically the same idea used to derive Newton's $F = ma$, if you are happy to use Lagrangians

CooperCape

@JohnRennie Think I went on a Geography trip there once.

John Duffield

@Abcd : I think so. See What is an Electron? by Frank Wilczek. He said "to understand the electron is to understand the world”. That’s good. But he also said "there are several inconsistent answers, each correct”. That’s not so good. But he also said "the proper quantum mechanical description of electrons involves wave functions, whose oscillation patterns are standing waves”.

@JohnRennie Hey ! Good morning :)

@JohnRennie It would have been amusing if parts of the Star Wars films had been filmed there.

@Tanuj Morning :-)

9:50 AM

@JohnRennie something strange happened just now.

@JohnRennie The font size here decreased .

You mean, you accidentally knocked the scroll wheel on your mouse, while holding down the control key?

@DawoodibnKareem idk what I did , I don't even use a mouse.

Ctrl hyphen?

Or just the two finger zoom on your touchpad?

@DawoodibnKareem Thanks , it was indeed ctrl+hyphen

Use Ctrl zero to restore it to 100%.

9:55 AM

@DawoodibnKareem Yea , I did it.

CooperCape

GPE $\propto\frac{1}{r}$, right?

I'm not being a fool here...

right.

yea

aight thanks

sure thing

@CooperCape You can derive that by integrating force with respect to distance. Then you'll never forget it.

CooperCape

9:59 AM

too much thought... :p

jks but sure

I just derived those formulae for electrostatics and they are mostly similar to Gravitation

Yes, Newtonian gravitation and Coulomb electrostatics are fairly similar

Except for a sign

yups , since charges also have sign

@Rick How's prep going ? Gave any mocks ?

Felix.C

I read in Neamen's "Semiconductor physics and devices" about the Kronig-Penning-Model and I saw the extended aswell as the reduced E-k diagrams. I've already seen many images like the one below. Does this imply, that the valence band always lies in a even Brillouin zone while the conduction is in a odd one?

10:35 AM

Clonazepam has toppled me

Never again

Pieter

10:47 AM

@Felix.C In one dimension, bands are in different zones.

@0celo7 @Bernardo Ohhhh fantano going at JBP: twitter.com/theneedledrop/status/972740103473909760

Pieter

(But then there is the extended zone scheme, and everything can get translated to the first zone.)

HAHAH wow JBP is truly speaking like a complete idiot on that article

i think he's gone senile finally

(You are talking about the guy who wants to ban racial studies courses and thinks it's a question as to whether men and women can work in the workplace together, it's not a bug it's a feature)

You know what, @bolbteppa, I take back my previous comments on JBP being wrong but subtly so.

10:56 AM

Finally SSB from a group perspective, after months

Also I haven't actually seen him speak about the racial and gender studies courses and his rationale behind prohibition of those courses.

So I don't really know much to comment on

11:09 AM

I've just managed to turn two non-functioning Nexus 9 tablets into one perfectly functioning Nexus 9 tablet (and one paperweight) so I'm feeling a bit smug right now :-)

I honestly don't know what's up with conservatives trying to mark off certain pieces of artwork or entertainment as propaganda. Stories have been used to convey a key moral for a long long time: Aesop's fables, for example. Fuck, even the Bible is that. Greek mythology is full of messages about human values - that's propaganda.

Compared to those, propaganda that's inherent in fucking Disney movies are nothing. It's just standard simplification of power dynamics between the various characters involved. (which, incidentally, is why I don't watch Disney - I don't see the appeal at all)

@JohnRennie paperweight?

Visser's exercize section on causality ain't easy

@BalarkaSen or doorstops. The fate of irrecoverably non-functional consumer electronics.

Was there any logic to those accusing Socrates of corrupting the youth, this kind of thing has gone on forever

@bolbteppa I was corrupted as a youth, something that greatly enhanced my enjoyment of life.

11:25 AM

The people viscerally upset by Bambi maybe just feel shame for that enhancement :p

why be upset by Bambi, because of his poor grammar?

@bolbteppa I am just amused because they were accusing Socrates, and we are, after 2500 years, are accusing fucking Diseny

Of course it's a GR author

Cosimo Bambi

Cosimo Bambi (born 1980, Florence, Italy) is an Italian relativist and cosmologist who is currently a professor of Physics at Fudan University in Shanghai, China. Bambi's research interests include strong field tests of general relativity, modified gravity theories, gravitational waves, quantum gravity, accretion flow around black holes, baryogenesis, galaxy clusters, primordial black holes, whether black hole candidates obey the Kerr Metric, Inflation, antimatter, strange quark stars, neutron stars, naked singularities and other compact objects He has close to 100 publications in all the above...

@JohnRennie Hah.

is there a Bambi theorem

11:34 AM

There is apparently a crazy link between SSB and gravity

salon.com/2014/07/29/…

I'd say them being so afraid of Mickey Mouse or a birth certificate etc has something to do with that, you probably wont find the answers in logicking it out directly

What could it even mean to say gravity is SSB

@JohnRennie are you around ?

@Tanuj Hi :-)

Hi !

on putting $x=y=0$ I get $f(0)={f(0)}^2-{f(a)}^2$

what to do next ?

@JohnRennie from here , I also get $f(a)=0$ , how to proceed now ?

11:56 AM

To be honest I find myself struggling to get interested in maths problems ...

at least you're not struggling to get it right .

But it's fine , I have done it , was just interested to know your approach

My approach is to go make a coffee instead

@JohnRennie hmm interesting , let me try that .

... though possibly not in the exam :-)

Philosophy of science question:

12:00 PM

@JohnRennie yea def not

How much and what kind of correlations between A and B we need to find before we can be confident enough to claim a causal relationship between A and B?

@Secret Hi ! Good evening :)

Tanuj: Hi, I am otherwise analysing my second batch of data in my PhD. It's tedious and repetative, and the interesting thing only pops up when all the correlations are put together

Mr. Xcoder

Noob-ish electricity question: If one connects two identical batteries of e.m.f $E$ in parallel, the equivalent e.m.f $E_e$ is the same as $E$?

yes

all parallel circuits share the same voltage

Mr. Xcoder

12:10 PM

Moreover, if the circuit is ideal, and the batteries both have internal resistance $r$, the equivalent resistance $r_e$ becomes $$\frac{1}{\frac{1}{r}+\frac{1}{r}}=\frac{r}{2}$$?

Thanks!

yup

Great, ty!

Hi @Secret

@Lozansky hi, what brings you here

The wonders of physics

12:11 PM

indulge, there's a vast universe to learn about

Quantizing gravity, and why it is difficult by Leonard Susskind

Maybe this has all of life's answers

►

I just kinda finished showing $e^{-(x^2+y^2+z^2)/a} \overset{\mathcal{L}}\mapsto (a\pi)^3 e^{-a(\xi^2+\eta^2+\zeta^2)/4}$

Only I got $(a\pi)^{3/2}$ instead arghhh

12:28 PM

Let's play the game of What Went Wrong

We have$$\int_{\mathbb{R}^3} e^{-(x^2+y^2+z^2)/a} e^{-i(x\xi + y\eta + z \zeta)} dxdydz $$
picking out the x-coordinate yields
$$\int_{\mathbb{R}} e^{-x^2/a-ix\xi} dx = \int_{\mathbb{R}}e^{-\dfrac{1}{a}(x+ai\xi/2)^2-\xi^2a/4 }dx = \{x'=x+ai\xi/2)\} = e^{-\xi^2a/4}\int_{-\infty+ai\xi/2}^{\infty+ai\xi/2} e^{-x'^2/a}dx' = \\ = \{\text{By Cauchy's theorem}\}=e^{-\xi^2a/4 } \int_{-\infty}^{\infty}e^{-x^2/a}dx = e^{-\xi^2 a/4}\sqrt{\pi a}$$ and so the original integral should be $(\pi a)^{3/2}e^{-a(\xi^2+\eta^2+\zeta^2)/4}$

Ehh that should be $\overset{\mathcal{F}}\mapsto$

@JohnRennie...You there ?

@NehalSamee Hi

Though I'm only here for another 20 minutes or so

@JohnRennie....So have you got any conceptual way or thought experiment to deny my book's saying ?

You can post your idea whenever you get free time ...

Can you post a picture of that bit of the book. I can't comment on what your book says unless I understand exactly what it is saying.

12:44 PM

Let's see....

@JohnRennie...The book says :**If a satellite remains very near to the earth's surface , i.e. , if h is very small compared to R , i.e. those satellites that revolve around the earth in larger orbit , then their time period becomes large and velocity of rotation becomes small.**

Couldn't use imgrur...😅

That's just saying that as you increase the distance from the earth the orbital velocity decreases and the period increases.

Abcd

@JohnRennie Entropy can be created but not destroyed?

(...or @anyone who knows the answer?)

1:04 PM

@Abcd Are you basically restating the second law i.e. total entropy never decreases?

Entropy is a property of a (dynamical) system. If the system is spontaneous, the entropy always increases. To my understanding, if you want to decrease the entropy you'll have to apply some exterior force or something - in any case entropy of the exterior of your system (if you think of your system as embedded in a larger system, namely, the universe) will increase

That's the second law of thermodynamics, that the entropy of the universe (in which your system sits in) always increases

Yes

@BalarkaSen the propaganda stuff confuses me too

I really got lost when Molyneux did a series on it

@0celo7 I think these are evidence of the fact that even the rational section of the conservatives have their own propaganda to promote and propagate behind their veil of logical socio-political commentary. Which is fine, if they didn't accuse counter-propaganda of being harmful.

In 50 years you'll have the conservative right turning into the radical social-justice left that they abhor.

1:28 PM

@BalarkaSen what I find difficult to believe is that they’re making propaganda intentionally

The stories are likely influenced by the current political/social atmosphere which is Not Good

Oh you mean this Disney shit? For sure

Q: Why don't the molecules in the air "observe" the electron in the double slit experiment?

0

Question says it all. The air should also interact with the electrons which should result in wave function collapse.

quantum-mechanics

I mean people don't want entertainment to be disjoint from the current social affairs in their country, especially not in this age of irony where we filter and perceive everything that happens around us through ironical gallows humor

This is actually a valid question, however I don't know the answer

'be good to others' - pch, propaganda distracting us from competitive advantage

1:31 PM

It's just a good business policy

The last Star Wars did have some obvious overt propaganda.

also consider the new Black Panther movie :p

It was clearly meant to be anti-capitalist but they made it exclusively about war profiteering so it’s hard to say anything against it

@BalarkaSen I haven’t seen it

Is it very political?

Honestly, that is absolutely insane

@0celo7 Very directly so

I haven't seen it but I have talked to people who have

1:36 PM

@BalarkaSen At no point does Inspector Clouseau show up

@0celo7 really? I did not see that, how is it political?

Very misleading

on a side note you should listen to the Black Panther soundtrack tape

it's Good

Pink Panther Theme Song

►

I prefer this tune

I've listened to it about 20 times

Haven't seen the movie though

1:37 PM

hah

Black Panther is the most political of the MCU movies, and it is also well praised by both the critics and general alike. I have watched it and I also like it

Star wars is propaganda but telling people to leave their families, wholesome values theglobeandmail.com/technology/… theguardian.com/lifeandstyle/2008/nov/15/…

Molyneux is a legend

Wow I guess I still know very little on what capitalism is, cause I cannot seemed to find the anti capitalilst message in The Last Jedi

literally the whole casino part

contributed nothing to the plot

1:45 PM

I see

I thought people would have been more upset that the diverse cast members (Finn, Rose, Holdo) were actually really, really stupid in the movie.

As much [opinion incomprehensible] as holdo is, I found that hyperdrive kamikaze soooooo coooool

2:06 PM

I really don't understand the question and the first step here..

Ok..I think I get it now, sorry for the inconvenience..

2:27 PM

texpaste is pretty slick compared to mathb, texpaste.com/n/lxpnxjj6

Persefone - Spiritual Migration (Full-Album HD) (2013)

2:47 PM

►

This is pretty dope

@Secret It's strange how black phosphorus has a similar structure as that of graphite and in fact is a conductor

Is that purely a consequence of the pattern of the crystal?

well, the crystal arrangement and the free electrons that can be donated determined part of the electronics of the substance

Mmmk

Makes sense

But I don't know enough of the specifics ono how black phosphorus electronic structure depends on

I don;t know as much about solid state chemistry as much I like to, because most of the things I came across are molecules or interfaces

Aha

What do you work on? I don't think I asked you before

Organomatellic catalysis and some computational chemistry

2:59 PM

I see

Anonymous

@Secret Any plans for after your PhD?

@Blue Well, the immediate thing is a postdoc, but I wish to be able to work a bit on some of the personal projects I want to do, such as doing some pure maths, making a minecraft mod and summarising all the ideas I have in my entire life

In the past, I always failed myself during the holidays because I end up procrastinating and wasted the time

Anonymous

@Secret Oh. So you're staying in academia. Maybe you could find out something interdisciplinary between pure math and computational chemistry (but I guess that would be very very rare)

Anonymous

Although data science nowadays does involve a lot of rigorous math

Anonymous

@Secret Well, get a job during the holidays :P

3:09 PM

But the projects I want to do, because of their often study like nature, does require a lot of focus, but my problem is I get distracted easily

Well, there's actually a lot of involvement between maths and computational chemistry (the various numerical solvers will require you to understand things like sparse matrices, various things about eigenvalues as well recursive functions)

Anonymous

That's a very interesting field actually

It will get even more interesting in a few years, because of the massive power promised by quantum computers

when we have more qubits and also the error algorithms are more mature, then computational chemistry and computational physics will explode with discoveries very rapidly

Anonymous

Exactly my thoughts :). I'm expecting (although my expectation might change with time) to pursue higher studies in the interdisciplinary fields relating to QC,QE,DS,ML, etc. Allows for a lot of flexibility

Anonymous

@Secret Also, I think in the future such people as you will be in high demand in the pharmaceutical area

3:33 PM

Morning

How is
\begin{align}
S &= \frac{1}{2} \int d \tau [ m \dot{x}^{\mu} \dot{x}_{\mu} - i m \psi^{\mu} \partial_t \psi_{\mu} ] \\
&= \frac{1}{2} \int d \tau [ m \dot{x}^{\mu} \dot{x}_{\mu} + i m \dot{\psi}^{\mu} \psi_{\mu} ]
\end{align}
describing an electron in first quantized language, the first part is the einbein relativistic action of a particle, how is the extra part not describing an extra particle, apparently both functions describe the same particle...?

I think it's supposed to be the path of the electron + the orientation of the spin?

both of which are parametrized by the same variable

Apparently if you work out the ang mom current the $\psi$'s build up the spin angular momentum, and the $x$'s build up the orbital angular momentum, but I mean it's absolutely crazy adding an extra spinor function and it all describing one electron of mass $m$

Well, it's not quite a spinor

It's not $\psi(x)$

I mean in the end, the polarization is an extra degree of freedom

So it makes sense that it can be described by another component

Hmm, well it's supposed to be a Majorana spinor and they exist for $D = 1$, the action is supersymmetric, which is what it was introduced for, but then the guy says it also describes an electron which is pretty jarring

Q: If the temperature slightly decreases in a low pressure area would there be harder wind blowing,softer wind vlowing or will it stop blowing?💁

3:46 PM

-1

High and low pressure area's in change from temperature.

particle-physics

boy oh boy

so much wrong there

@bolbteppa btw I think I know the original paper this idea is from

It's from some 60's paper about path integrals for fermions

By doing an integration over paths and an integration over the spin group

(I know it cuz it's a standard paper in the treatment of path integrals over multiply connected spaces)

Bottom of page 1 they give a 1976 reference, but it may be for the SUSY EM extension ictp-saifr.org/wp-content/uploads/2014/08/Nathan-I1.pdf

I think we can add Portuguese (if that's what it is) to the list of languages to be translated :\

If you were on a desert island, you'd probably come up with this model before the normal Dirac Lagrangian to describe a relativistic electron, this is pretty insane thinking about it

It's a fairly fine model

It just has the usual problems of point particle models

The country with the highest total Physics SE reputation per user is...

wait, what?

@EmilioPisanty the problem with very high scores

it skews the statistics

3:58 PM

@Slereah indeed

you get e.g. 30% of the UK's total rep in a single user

that we will not name

And anna is 92% of the score of Greece

lolz

Lubos needs to up his game

Lubos seems to have retired mostly

He won't even answer my obvious bait questions

sad!

4:05 PM

Ordered by the percentage of total rep contributed by the top user.

English question:

I want to find a list of words stronger than crushing, but weaker than erasure

I need that to describe a worldbuilding idea

eradicate

Loong

> WHEN UPPER(Location) LIKE '%HO CHI MINH CITY%' THEN 'China'

what?

@Loong not my code

obviously written by a chinese

WHEN UPPER(Location) LIKE '%TAIWAN%' THEN 'GLORIOUS PEOPLE'S REPUBLIC OF CHINA'

4:08 PM

@Slereah is chinese a countable noun?

Have you ever saw the spelling Chineses? -_-

@Secret no, I haven't

I would find it worse, for sure

if I had to write it, I'm pretty sure I'd just give up

yeah, not to mention, hard to pronunce any ese words if they have an extra s

4:35 PM

@diobuceulb Oh god, what'd you do to your name

It's not fun having to write your name in one direction, and mentally read it in the other direction

5:17 PM

?tuoba gniklat uoy era kcuf eht tahw

5:29 PM

If $G(x,t) = \dfrac{1}{\sqrt{4\pi at}}e^{-x^2/4at}$ is the Green's function that solves $u_t - au_{xx} =0, \quad x\in \mathbb{R}, t>0$ with $u(x,0) = \delta(x)$ then is $G(x,y,t) = \dfrac{1}{4\pi at}e^{-(x^2+y^2)/4at}$ the Green's function that solves $u_t - a(u_{xx}+u_{yy}) = 0, \quad (x,y)\in \mathbb{R}^2$ with $u(x,y,0) = \delta(x,y)$?

Asking for a friend

I mean, if you have it

why not check by hand?

If you know what susy is, and you take the NG action and apply the general idea of susy to the fields you can determine the supersymmetric NG action as a means to close the susy algebra, I thought susy came from string theory out of unavoidable necessity as if by magic, hmm

SUSY was created independantly of string theory

It was just some idea of extending the Poincaré group

Yeah, maybe I'm going off pop-sci thinking but I remember thinking you could just end up with susy by looking at the NG string action for some reason

Let's see the first SUSY paper

5:45 PM

'String theory predicts that a type of connection, called supersymmetry, exists between these two particle types.'

jetpletters.ac.ru/ps/1766/article_26864.pdf

here's one of the oldest paper on SUSY

Manolis Lyviakis

why $ V_b-V_a=W/q_o$ and not just the work from A to B?

although I can't see where the SUSY comes in from skimming it

Manolis Lyviakis

why we devide with q?

arxiv.org/pdf/1401.5977.pdf

"The last two representations O(Ξ) and O′(Ξ) describe states which look like massless “objects”, particle-like in the sense that they have four-momentum, but with bizarre helicities: each representation contains an infinite tower of helicities, one with integer helicities, the other with half-odd integer helicities. These have no analogues in Nature"

Hm

5:48 PM

Yeah it's pretty incomprehensible, the Witten argument about scattering is pretty good

Are strings in string theory related to continuous spin reps?

"Yet, O(Ξ) and O′(Ξ) contained important information: they are “supersymmetric partners” of one another!"

:O

'6 Russians'

@bolbteppa Is that a joke setup

The Berk lectures he basically says the same thing, '6 Russians'

Six russians walk into a bar

5:50 PM

and knew about supersymmetry before everybody

They got a few nobel ideas before their times in some forms apparently

"The close relation of the two sectors is soon after formalized by Jean-Loup Gervais and Bunji Sakita[17] who write them in terms of a world-sheet σ-model, with different boundary conditions, symmetric for the fermions, antisymmetric for the bosons. They call the transformations generated by the anticommuting Virasoro opertors, supergauge transformations, the first time the name “super” appears in this context."

I guess it was first in string theory

Sigh, I figured out that my email app was sending everything under the name "Sir Cumference", whereas gmail used my real name

Why does this have to be so complicated

hope you didn't e-mail your profs with that name too

6:07 PM

you can sign your emails to professors by "Sir Cumference - you can't handle his girth"

2

Apparently string theory has a link to CSR, but it's the opposite one

String theory predicts no continuous spin fields

@GaurangTandon for a fuller table of translations see here

CC @Secret @JohnRennie

That first paragraph in sec 4. on dual models is kind of shocking, up to "this early example of fermion-boson kinship led, through an unlikely tortuous path, to modern Supersymmetry", i.e. experiments hint at some link

"the Regge shadow of the bosonic t-channel’s ρ-meson averaged the fermionic resonances in the s-channel! This was totally unexpected since these two contributions, described by different Feynman diagrams, should have been independent."

Also this. But it misses out on "Ending an email with 'Regards'"

2

@JohnRennie will confirm that it is just short of a nuclear option

@diobuceulb Indeed, I'd asked for research with that name...

'It is crucially important to distinguish between local supersymmetry -- supergravity --and global supersymmetry -- a solution to supergravity which has at least one Killing spinor. What the LHC looked for is the latter. What string theory predicts is the former.'