@ACuriousMind do you still solve physics exercises (from textbooks)?

@Blue Man, that sucks :/ But you still have e.g. spec rel and QM, right?

@tttt You might want to phrase that differently, "mentally challenged" is a term for people with intellectual disabilities :P

ah damn

i mean... eh... how to explain

But yes, I do find my job sufficiently intellectually stimulating to not be boring

ok that ^^

do you still force yourself to learn some physics @ACuriousMind by solving exercises, reading papers and/or going through textbooks

@Blue Whoa wait, QM in the first year?

@tttt I don't, and I rarely did. I find most exercises boring or annoying.

@Blue did you study lockin amplifiers?

I see @ACuriousMind wow. I mean you reached a crazy high level in physics

@tttt I read the occasional paper if it catches my interest, but I haven't really learned any major physics in the last year

ok thanks @ACuriousMind for answering my questions

np :)

@Blue Huh. Even the biophysicists here are required to take SR :/

Well at the very least you'll be a lot more prepared for applications or CS than me

@Blue Shankar?

lmao my spec rel TA was named Shankar and is Indian, for a second I was like "wait, you know him?"

@SirCumference My transcript doesn't list a single CS class :P

So I can see the future and travel to the past inside a black hole?

@LeakyNun Only if you make it inside the black hole before the universe ends :P

@Blue I mean we really only have one CS theory class, about computation theory. I don't think we have any on quantum computing

@ACuriousMind Yeah but who knows, hopefully I'll find a way to apply this stuff

@ACuriousMind what does this mean?

@LeakyNun It's a slightly facetious answer to your question - an outside observer will pass the entire lifespan of the universe and never see you reach the event horizon, cf. physics.stackexchange.com/q/21319/50583

sure, but I'm inside the blackhole

Yes, for you a finite amount of time passes. I'll have to admit that never really made sense to me so I try to avoid thinking too hard about black holes :P

But it sort of suggests you can't travel to the past

Because you could then arrange to be at the same position as you were at some instance before you fell into the blackhole, meaning your worldline is a closed timelike curve

But the Schwarzschild spacetime has no closed timelike curves.

@ACuriousMind I don't think that suggests you can be at the same position as you were

because space is timelike

@LeakyNun Well, but if you can't, then somehow when you travel back n years you must end up n lightyears away from where you were n years ago

sure

but I'm still travelling to the past nonetheless

My point is that that's a ludicrous proposition: Regardless of how we even define "n years ago", what magical force is supposed to ensure that you don't get close enough to yourself to reach yourself?

Also, the situation seems to me to be symmetric: If an outside observer never sees you falling in, they also never see you coming out. Your time travel takes eternity times two :P

But, as I said, I'm not an expert on black holes. Don't take my word.

@ACuriousMind the flipped sign of the distance squared in the schwarzschild metric

@ACuriousMind I'm not coming out, I'm just time travelling inside the black hole

Oh

black holes are confusing, I hope they patch them in the next version

@LeakyNun Then sure, but since time is space and space is time, that's not "time travel" in any meaningful sense :P

Or maybe not

I never really get what do people mean when talking about traveling in the past

whose past are we talking about?

if I'm an observer how could I "travel" to my own past?

@user2723984 The only proper formalization I know for "time travel" is "existence of closed timelike curves".

then it would be the future

yes but as far as I know they only exist in really weird metrics

The Kerr metric is not so weird :P

(But the closed curve is behind the horizon, iirc)

it's a black hole on steroids

But I do think "closed timelike curve" is a good formalization of time travel. It definitely means an observer can have an event both lying in his own subjective past and his own subjective future.

@ACuriousMind lol yeah the formatting is important...

@enumaris I...can't quite tell which of my messages that's a response to :P

The linguistics chat you were having w/ Emilio about German

EA has reached out to me in response to my application for their AI Scientist role

do I interview with them and sever ties with ACM forever? ...

oi

XD

I think I'll tell them no thanks

the role is in northern cali and I feel like there's very little chance I'm gonna actually go there to do it

I spent 5 hours in meetings today o.o

wowzah

It's probably partially because I'm in an intro phase, but it's a pretty foreign concept to me. There were probably some months that I didn't have 5 hours of meetings in my last job lol

yeah...I don't have too many meetings currently

apparently paid sick leave is not really a thing

I'll have to use personal time or PTO...

hmmm

guys, I'm not sure what they mean here

they haven't really specified how those product states would actually look like, have they?

they just said that they could denote the joint state as $\vert A\rangle\vert B\rangle$

so I don't see how you can apply the superposition principle to something that hasn't really been defined yet, and then to arrive at the tensor product postulate