4:47 AM
@PM2Ring oh dear God, Duffield's come out of his shell again.
@bolbteppa No, those are geostationary units.

5:24 AM
Time to ban Duffield again

2 hours later…
7:51 AM

8:16 AM
"For a certain class of three-manifolds, the angular momentum of an asymptotically flat quantum gravitational field can have half-integral values."
whaaat

2 hours later…
9:48 AM
@JohnRennie Looks good to me.

10:34 AM
@Slereah That may be a little premature. Sure, he's annoying, and posts misleading &/or confusing stuff. But I haven't noticed him posting his blatant non-mainstream pet theories yet.

11:11 AM
I'm pretty sure posting nothing but misleading answers on a q&a site should be ground for banning

1 hour later…
12:38 PM
Any mods around?
I just flagged a post for deHNQification, it's probably quite time-critical =|

@EmilioPisanty Mods are asleep, everyone post questions about personal supersolid dark matter theories
Which question was it?

@JMac the obvious one =P

12:58 PM
Of course, a question can be removed from the title simply by including some MathJax in the title. (But I suppose that on Physics usually more suitable title contains no formulas - unlike on Mathematics, where for most questions it's difficult to make a descriptive title without using some math.)
It seems that today only a single question from Physiscs entered the HNQ list (so far): chat.stackexchange.com/transcript/13775/2019/6/26

I wonder if anyone could guide me to a textbook or paper describing how the error analysis in experimental HEP is done. I'm hoping to understand how one can estimate errors and confidence levels on - say - the cross section of a particular reaction.
(using experimental data of course)

1:16 PM
"In this paper, we will focus on an efficient deep neuralnetwork architecture for computer vision, codenamed In-ception, which derives its name from the Network in net-work paper by Lin et al [12] in conjunction with the famous“we need to go deeper” internet meme [1]"
Goddamn nerds

1:44 PM
@EmilioPisanty Done.
Why is it that people seem to believe that adding "quantum" or "photon" to a question suddenly makes it deeper or more informative than framing the question in classical terms?
4

2:05 PM
@Slereah how goes the gr

quantum entanglement of consciousness

2:21 PM
@RyanUnger would go better if I didn't have that whole job thing to do, certainly
Having to read up convolutional neural networks to recognize things in photos
I can recognize things in photos, you can just ask me

I can spot a photo of an elephant no problem

Quantum woo corrupt everything that is legitimate quantum

where's the metrology mysticism

Pyramidology (or pyramidism) refers to various religious or pseudoscientific speculations regarding pyramids, most often the Giza pyramid complex and the Great Pyramid of Giza in Egypt. Some "pyramidologists" also concern themselves with the monumental structures of pre-Columbian America (such as Teotihuacan, the Mesoamerican Maya civilization, and the Inca of the South American Andes), and the temples of Southeast Asia. Some pyramidologists claim that the Great Pyramid of Giza has encoded within it predictions for the exodus of Moses from Egypt, the crucifixion of Jesus, the start of World War...
this
pyramids explains everything
OMG woo

3:12 PM
hi folks, I was wondering if anyone could confirm that I'm interpreting correctly a sentence that I read in some lecture notes: "the spherical harmonics of order $l$, $Y^m_l (\theta, \phi)$ transform under rotations under the $2l+1$ dimensional irreducible representation of $SO(3)$". Does this mean that in general $Y^m_l(\theta ',\phi ')= \sum_{m=-l}^l A_{mm'}Y^{m'}_l(\theta,\phi)$ where $A$ is a matrix in said representation?

3:24 PM
@dmckee ahem?

Well that's what triggered me recently on that matter, but it's a persistent issue.

3:41 PM
@dmckee I thought there were no stupid questions

@RyanUnger there's deeper questions
stands to reason that there's shallower questions

4:19 PM
evening gents

4:54 PM
Does anyone have any recommendations for textbooks on numerical physics/computational methods for physics? Looking for something quite general.

Isn't there some big standard book for C programming for that

5:21 PM
@alex1stef2 I took Bill Gibbss' course at NMSU using his own text. I like the text for it's small size and assumption that you can think.
But (a) all the example code is in fortran 77 (except the bits in intel 8086 assembly) and (b) it is rather focused on problems of interest in nuclear physics.

5:33 PM
Shoo shoo begone fortran

6:22 PM
If $T$ is an observable, is there some physical meaning of $||T\psi(t)||$, where $\psi(t)$ is the state of a quantum mechanical system at time $t$?

6:34 PM
@dmckee Pffft! Real deep questions involve antimatter. :D We got one today from someone who's been watching a Bob Lazar interview...
-2

I watched an interview with Bob Lazar where he drew detailed plans for alien spacecraft that propels itself with anti-matter. His explanation is that the spacecraft would create a gravitational field emitting from it's "thrusters", the spacecraft would then "fall" into the space in front of it m...

7:15 PM
@JannikPitt erm it’s kinda confusing what you mean could you try saying that again

1 hour later…
8:36 PM
@alex1stef2 Thijssen's book covers a lot of subjects. If you're interested in some more specific subject, then probably a book in that particular area would do best.