For now I think we have to admit we don't know WTF is going on with gravity and anybody who claims they do is probably delusional.

@JohnRennie I really like this as well, although as of a couple of hours ago, I'd like to know more about Kaluza-Klein

@0celo7 supersymmetry ::cough::

@JohnRennie OK, so: is the Equivalence Principle true?

@Phase trying to get Bernardo

@JohnRennie replace gravity with anything else and that statement holds.

@0celo7 put a textbook on the end of a fishing line

@EmilioPisanty I have no idea. Why ask me? The Eotvos experiment suggests that at least in its simplest form and in the low curvature limit the EP is true.

@JohnRennie I guess I just have a hard time wrapping my mind around how you could have the EP be only approximately true

I mean, we can’t even prove we’re not in a simulation

So everything is on shaky ground

pls help steam sale ends soon and I have no clue what games to buy

:(

ah...I had 150gb of free space left on my 3tb hd...seems like I could have done the full dataset without removing the 50gb of data and had 50gb left. Oh well no big deal.

Hey @JohnRennie that neon spectrum

it feels like it's missing states

there's not a lot there

@Phase As an old fart™ I can't help feeling you should put your money to better use e.g. buying beer. But then I have to confess to many, many wasted hours playing Doom back in the day :-)

Hi everyone

just $2s^2 2p^5 n\ell$ valence excitations

@JohnRennie It's already on my steam so it's too late for beer : p

Oh crap I need to buy max Paine

I also don't drink

What time does it end on my continent?!?!

and a smattering of $2s^1 2p^6 n\ell$ mid-core excitations

@ACuriousMind Hey, long time no see! How's it going with you lately? Where are you with your studies at the moment?

@0celo7 no idea, are you ahead or behind, also get MP3, the other ones are old and not as fun to play. Read the story of the previous 2 tho, they're only about 2 paragraphs long

shouldn't there be two-particle excitations too?

@Phonon he sold out :^)

or heck, single-particle core excitations

@Phase I don't know what games you like, but I'd definitely recommend "The Witness" to everyone

or are all of those autoionizing?

It ends in 48 minutes

@EmilioPisanty It's over 30 years since I studied excited states of atoms in any details, and my memories of them have disappeared along with millions of neurons :-)

Oh dear god I don’t have steam on my laptop

@JohnRennie =|

Howdy.

btw does this really still need protection?

@0celo7 look on the bright side, you might have not liked Max Payne : P

I imagine it was HNQ at some point

I can boot windows on my laptop and use steam there

This is terrible

Would it annoy anyone at the moment if I expound on a potentially crackpot idea? (I use the word because that is, I believe, the correct level of skepticism it deserves.)

@Adirian this is the idea you alluded to in your recent question?

interesting new article on quantamagazine: quantamagazine.org/…

@0celo7 I think there are some co-op maps in Max Payne 3 too but ive never played em so Idk how good they are

John - Yes

@user929304 I do like Natalie Wolchover's writing.

@JohnRennie very much the same here

@user929304 did you see the recent interview with her and Sabine Hossenfelder?

@JohnRennie no I missed that one :(

@Adirian you are welcome to ask. We promise not to laugh :-)

@user929304 Let me see if I can find the link ...

If it doesn't have Consciousness creating gravity as an axiom I'm not gonna condone it @Adirian

Crank shit has gotta be Crank

@user929304 this is the link to the interview

I love how in the abstract for a paper that is guaranteed to be pure numerology, they claim they determined the value of the fine structure constant using pi = 3.14

@JohnRennie brilliant, thanks!

@Phase didn't Olaf Stapledon use that idea in Last and First Men?

I dont know what either of those things are

@JohnRennie I found how we can fix Gravity

@Phase we have had our own cranks people with unconventional ideas on the site. We don't need any more :-)

@JohnRennie huh. Yeah, I guess I just formed my intuition on much bigger atoms

@Adirian are you going to ask?

like helium?

or like really big?

if you look at, say manganese, it has excitations of the form $3d^54s^2$ to $3d^7$ and other such two-particle levels

😲 manganese

@EmilioPisanty I cant even post on protected questions anymore..

but those don't show up at the top of the table

@Phase ok tell me what games to buy

@0celo7 I can't handle that sort of pressure

I personally enjoyed Max Payne 3 and Superhot quite a lot

Both of them use bullet time as a central mechanic

Superhot far more though

@GPhys helium isn't bigger than neon

tomb raider games

are they any good?

Idk never played em

I've heard they're a bit like Uncharted

and Uncharted can be fun

So, the basics of it are, there is only one "force", which is a relativistic sinuisodal variation in spacetime. So the cosmological constant is space bending one way, and gravity is space bending the other. In lieu of electrical force, there is another repulsive portion, and so on and so forth. Most of the bosons are wave variations in this force; fermions are singularities, or collections of singularities, at points where the force permits them.

Uncertainty arises from the behavior of singularities; information can't escape them, including location, and they form Einstein-Rosen bridges causing information to pass back and forth between universes. Uncertainty causes energy quantization, as probability waves only collapse when energy is released (as no other probability has energy left to release at that point), meaning energy only arises in specific quantizations (those necessary to cause a particle to emit energy).

did you just get the base game for MP3?

@GPhys manganese isn't that big. it's at the top of the transition metals

@Phase HURRY I HAVE 32 MINUTES

@0celo7 I got the complete but idk if its worth it

It has more maps in multiplayer

@Phase why's that?

But idek if multiplayer is still alive

I can't imagine playing the multiplayer

I cant either, aside from the co op

Ill check if any of the maps are co op maps

is this Prey game any good?

Nah I don't have a lot of money right now

I'm getting the base game

and what happened to your chat user's parent user?

Civ 5 is on sale

@0celo7 kk

is that any good?

Idk about Prey

Never played Civ

I've heard its good though

sigh, I feel a bit upset. A professor of mine once told me that I was among the best 10% students he has ever taught, but he doesn't seem to me willing to write an recommendation letter for me to apply to a local master program. No idea what's wrong...

"Middle Earth Shadow of War"

@0celo7 shadow of microtransactions

fug

EA?

Idk dont think so

Think its just regular greed

@Phase Ayy is Rainbow Six Seige still alive??

Fuck i could've bought that

But I just spent my money

GET IT

how much is it

NÖ

7.50

C'mon you know you want it

I have 1 pound

:(

They're gonna make free zombie maps too

@0celo7 go get The Witness already :)

Sigh I guess I'll top up my steam wallet a bit

@Phase Ok you're getting it?

@ACuriousMind BUY IT RIGHT NOW

Wait

@0celo7 it says "starter edition"

on the cheap one

wtf does starter edition mean

oh no

it's a ruse

I think so

we have L4D2, Portal 2, etc tho

we have games

+ GTAV

yeah but I want a competitive online shooter

CS:GO.... : P

For it to work, as far as I can figure, the electrical force has to be an effect arising from electron behavior. I am pretty sure that works, but only if positively charged objects in a sufficiently large vacuum don't repel, or at least repel less than would be expected.

"Since the Starter Edition is the full game, you have access to all of its content. However, Operators will require more grinding to unlock than is required in the Standard Edition."

It's not a fun competitive shooter but it's competitive

...

That sounds tedious as fuck

sigh, wtf

"we want to give our players the satisfaction of unlocking more guns"

-Not EA

@Adirian the problem is that your idea is too vague to be useful. You'd have to come up with a mathematical framework that allowed you to do calculations with it. I have to admit I can't see how you would approach this ...

How long until you can afford PUBG?

It's not on sale so I don't have to buy it now

But I'm getting Civ V and MP3

yolo

@0celo7 like, the 10th

*5th

@Phase Ok let's get that then. I've heard it's intense. ACM won't play with us though

ACM wont play with us at all :(

He's pretty fickle

@ACuriousMind I'm talking about you

fight me

@JohnRennie I have been playing with formulas to try to get a Newtonian version; currently playing with sin(ln(r)) as a replacement for G. If I can get that, the next step would be a tensor version, which I suspect might be unsolvable for any but the most trivial (edit: problem).

@Adirian For example you say the cosmological constant is space bending one way, and gravity is space bending the other. I suspect you are thinking of something like the rubber sheet model for gravity, but this is not at all how spacetime curvature works.

failed attempt to make a meme: failed

"Your credit card information has been declined by your credit card company."

I'm poor

Dear god

Ive never had a card declined

wtf my steam account is locked

the FBI is outside my door

oh my god they're co

You got flagged by a government Spook

@JohnRennie I am thinking of it as compressed versus sparse coordinates as compared to an undistorted coordinate system; is that incorrect?

What do the terms compressed and sparse mean?

"Want to remotely install your new games?"

Huh

@Phase I put in the wrong 3-digit code.

Oh.

All that worrying for nothing

alright

if you think of something in the next 16 mins let me know

but I think I need to play my backlog

Sure dude, I'm up for playing anything tbh. I have tomorrow off so I can stay up too

So if you wanna play L4D2, Portal 2, GTAV, BL2 etc etc hmu

@JohnRennie If you overlaid the spacetime coordinates over a Cartesian grid, with points drawn at each integer position (1,1; 1,2; etc), they would be closer together/farther apart than the equivalent position in Cartesian coordinates

@Adirian perhaps it would be better to talk in terms of bases

and vectors

Have you heard of Affine spaces?

It doesn't work for GR but it's decent for SR, might help a bit

@Adirian I suspect you mean that the proper distance between points can be greater or less than the coordinate distance e.g. the distance between the points x=1 and x=2 can be greater or less than 1. But this is already the case in GR.

@Adirian the problem with new ideas is that you have to understand the old ideas to know how your new ideas differ. Otherwise you run into problems like this.

Einstein was only able to come up with relativity because he was a master of non-relativistic mechnics.

I learned GR before Newtonian mechanics and it made perfect sense

Hi everyone! I was reading resistivity values for different materials on the wikipedia page. They report the values for standard temperature, but they give no information about the cross-section or length of the material/resistor. Are this values independent of the cross-section or the length of the resistor?

OMG

@JohnRennie Yeah; the idea is an extension of relativity. It isn't a replacement; the idea is to replace the constant G in the tensor form of GR with a sinuisodal function of distance

there's actually been two peer-reviewed journals that went by the absolutely stupid name of "Physics"

aip.scitation.org/doi/pdf/10.1063/1.1745354

three, if you count one in Chinese

@Adirian if you do that energy won't be conserved, or more precisely $T^{\mu\nu}{}_{,\nu}$ won't be zero.

@JohnRennie Tbf I feel like Emmy Noether probably played a huge part in Einsteins formulation too

Emmy Noether? Why?

@Adirian people have been thinking about a variable G since ancient times

@Phase what?

@JohnRennie she resolved a paradox in GR and derived a theorem relating conservation laws to symmetries

GR has nothing to do with conservation laws.

Im pretty sure she also helped Einstein with the maths

But I'll check

@JohnRennie I think the total potential energy should end up equaling mass, if it works out at all

@JohnRennie fug, seems I overstated her involvement, she still helped a bit though ;P

@Phase no she didn't.

@JohnRennie wiki says she did :(

She was asked by Hilbert to look into conservation laws as a result of some work in relativity, and the result was her two theorems. But they are not directly connected to relativity.

Well no but she resolved a paradox-at-the-time through it right?

What paradox?

"Hilbert had observed that the conservation of energy seemed to be violated in general relativity, because gravitational energy could itself gravitate. Noether provided the resolution of this paradox"

From wiki

I admit I vastly overstated her involvement, but she helped at least a bit in the development surely

No, not really. Her theorem tells us that energy is conserved only when there is a timelike Killing vector, but that was not really connected to the development of GR.

:/, I'm not arguing that she's a huge influential figure, just that her contribution was non-zero

You aren't thinking of Marcel Grossman, who really was important in helping Einstein develop GR?

I may have earlier, but I rescinded my comment about her being significant, and just said that she contributed

crap

it's taking me about 1s to grab a mini-batch...320 minibatches will take like 5+ minutes...and it only takes 1 minute to train on 320 minibatches...hmmm...

bottlenecked at the grabbing minibatches stage...

what to do...

206 seconds for 320 minibatches..

hmmmm

@enumaris so I hear Bernardo rewrote your computer

lol

he just told me to uninstall windows

which I don't have on this computer anyways

@0celo7 it seems I may end up doing relativistic accretion disks? (for my GR final project)

@GPhys I don't know anything about those, so good luck

the only person who did was Chris White

hmmm that's super funky

when I have my terminal maximized

@Semiclassical the organizer put me on the seminar schedule as "Dr. Ryan" as a joke

the refresh-print works

lol

nice

if I have my terminal small, then it prints a new line at each refresh

I wrote a note on there that it was him so people don't think it was me

"dr Ryan"

He's protesting my advisor forcing me to call him Dr. X

But he's doing it in an ironic way

@0celo7 I could do pulsar timing arrays as well

@GPhys do you have to do physics?

I'm a math guy working in GR

I don't know the physics

this bottleneck is annoying

how can I speed it uppppp

@0celo7 do you know anything about pulsar timing arrays?

nope

I don't know as much about pulsars as I wish

ok so, actually it's the shuffling of the minibatches that's slowing things down so much

if I don't shuffle...it takes only 60 seconds to get 320 minibatches

hmmmmmmmm

@GPhys do the positive mass theorem

Could anyone give me a rough estimate for how insigificant Earth's gravity is for light going parallel to the surface, a few meters away from the Surface?

When I say rough I'm not even asking for a number, am I right in saying it's virtually undetectable by modern standards?

@Phase Yeah I typed it on my phone in the mornin had no idea it was even latexxing corerctly...

so $k^2u$...

no

$-k^2 u$

: P

$\frac{d^2}{dx^2}e^{i(kx-\omega t)} =i^2 k^2 e^{i(kx - \omega t)} = -k^2 e^{i(kx-\omega t)}$

Have you done complex numbers yet?

Easy to get a rough estimate

Let's get rid of SR and GR, and just model light as a very small-mass particle traveling at 300,000,000m/s. For a 1m of drop (takes on the order of 0.5 second with g=-9.8m/s^2), you go 150,000,000m so draw a right triangle with one leg 150 million and the other leg 1, what's the angle? About 7e-9radians which is like 0.001"

Nice, ty

If light has any mass it doesn’t bend correctly around the sun

didnt think of using equivalence principle

certainly, but that's a order of 2 or something I think

we are doing like...really rough...estimates...

I mean, if u wanna get a better estimate, then look at the bending of light around the sun

reduce the sun's mass to the Earth

see what u get

@Phase Yeah I know $i^2$ and stuff and argand diagrams just being a bit of a melt

Hey can heat capacity be negative?! I proved it is always positive!