Sunday again already? But it was #MathCoffeeSelfie literally yesterday...

"As the late Heidegger remarked--" "Late Heidegger?? The dude who wrote 'Being on Time'??"

oh, two is the only even prime? golly! three is the only threeven prime. five is the only fiven prime. pretty cool!

physicists

has anyone figured out yet whats going on with physics

Flying over Saturn - From Val Klavans (valklavans.bsky.social) - https://flic.kr/p/Ng1pvm

yes, that is me, I fit that role.

me neither

i hate quantum fields

so the asymptotic hilbert spaces H_in and H_out only describe the stable (possibly composite) particles we also assume H_in = H_out = H, so any state is labelled only by its (eventual) stable contents does this mean there is no creation/annihilation operator for e.g. a gluon?

df = (df/dx)dx + (df/dy)dy after cancellation, df = df + df so df = 0

tell me IMMEDIATELY if you have seen this woman

hey guys. i was incapacitated all day. please, please accept my apologies and submit your #MathCoffeeSelfie below.

Those who've followed me for a while will know that I'm doubtful about just how useful the notion of "expanding space" in explaining cosmic expansion is. I think the SciAm article linked here is a good example for where "expanding space" makes things more difficult than they need to be. 🧵 1/ 🧪🔭⚛️🎢

how do you pronounce Choquet-Bruhat?

who wants to write a QFT text with me

does make me wonder what the disease vectors are for philosophical zombieism

spectral sequences in prison, an analytic solution of einstein's equations in the trenches.... maybe i should get arrested or committed or

This analogy that Witten develops (pages 7-12) is very very helpful to me. He picks extremely concrete, infinite-dimensional systems w inseparable Hilbert spaces and shows what kind of choices & additional data is involved in extracting a choice of separable subspace therefrom

why can we assume that the electron wavefunction is supported in (concentrated in) the green area? in particular, disjointly from the solenoid.

given that we missed last week, this #MathCoffeeSelfie is a double. send two pictures, tell me what you've been up to twice, and drink 2× the coffee.

refreshing (what has become) the Epstein Files Website, looking at my bookshelf, refreshing again,

given that we missed last week, this #MathCoffeeSelfie is a double. send two pictures, tell me what you've been up to twice, and drink 2× the coffee.

pressing the button that makes life worth living

would you believe it if i told you that the discussion of ICE on BoardGameGeek.com is... not particularly enlightened

i am under the impression that a lot of people are not moved by Jaynes' arguments (that thermodynamical entropy is information entropy), but what are some good responses to him?

women only love diamonds in this world. they love squares in all worlds.

is there a renormalization scheme that takes the spacetime support of the interaction to be compact, and then enlarges it? would this work?

Huh, I don't remember having that conversation! Weyl classified finite-dimensional irreps of GL(n,R), and these correspond to irreducible "tensor densities" of various kinds. Indeed, there's a kind that you can integrate over a (n-1)-dimensional-surface with oriented normal bundle. (1/n)

damn, i think i looked really hot in that picture with stalin. i can't wait till he posts it on his instagram.

(butting into a conversation) heh. that's a pretty good layman's explanation. but actually "particles" aren't real. *pushes up my glasses* see the universe is actually uhm. its.. uh. it's this kinda... uhm. it's some kind of. y'know. fucked up math thing. waves and shit

I think I have been grappling with something similar: the question of whether E&M "uses" a spacetime orientation or not. The Maxwell equations are dF=0 and d * F = * J, (* the Hodge star) so a choice of orientation threatens to enter via *. However, the alternate choice should scale the equation

I am familiar with the theoretical side of this result but I have always wondered how tf did they experimentally measure this so precisely?

i can't do this i do not understand what is going on

This change in healthcare coverage by the PHSA is going to cost trans people their lives If you're in BC, please contact your local MLA and tell them something needs to be done about this The Vancouver clinic has double the wait time of GRS Montreal, and cutting it off will only make it worse

i don't understand why i have so many useless muscles in my face that don't have any purpose but are always on a hair trigger to wrinkle up my forehead and shit. and i just have to consciously avoid it, forever. sorry, what? whats an expression?

everything i know is basic, so i shouldn't feel pride in knowing it, but everything i don't know is also basic, so i should feel shame in not knowing it

suppose a free QFT. how does the path-integral approach relate to the fock space approach? how to recover creation operators, etc?

you'd think that we could measure (or predict) the probability distribution P(t) over arrival times, and combine it with the measures tr(pΠ(E)) to get a probability measure P()×tr(pΠ()) on spacetime... (where Π is the projection-valued measure corresponding to heisenberg observable X(t))

Thomas Pashby makes a really interesting point in his dissertation (Time and the Foundations of QM) when he notes that the probability measure tr(pP(E)) for location measurements is usually regarded as conditioned only on the quantum state being p, but unconditioned otherwise.

something fun about reading academic papers for work is that occasionally you notice one was written by someone who signed that amicus brief

2) its actual, intended purpose is to fit into a long pattern of the creation of artificial scientific debate concerning the legitimacy of trans people and their medical treatment. it exists as a pretext to deny further care. this is what i meant by "torture for the sake of perpetuating torture"

here there's a known treatment right from the start. there's not even a pretense of legitimate need to study this as a medical issue. it's just torture, of children, for the sake of perpetuating torture

the reason we have institutional review boards in the US, meaning independent groups that vet the ethics of studies, is because of the tuskegee syphilis experiment, a classic in the same "we have the treatment but we're gonna let you die horribly just to see what happens" genre of medical study

do you think its even worth surviving the next ten years or so

so much of the world's functions are about torturing children

They’re cutting us open without anesthetic just to see how long we live

I want to return to this now. Is this mass (the pole of the full propagator) the mass which is measured? How is it measured? How can I understand that what is measured coincides with the pole of the propagator?

Again, how am I like 30 and I don't know what the higgs mechanism is...