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12:00 PM
You don't need to talk German to me, and I'm not going to further your strange obsession with my country.
 
:'(
 
Damn
That's harsh
 
Sniffs
 
-3
A: Why are stars round whereas galaxies are disks?

Giovanni Maria TeofilattoThe age of Cosmos is calculated in 696 singlar point of time, in multiverse quantum atomic 1697 the rate of age of cosmos is 365 dimensional gradient time, so the age of Universe is equal to number of particle at beginning of Big-Bang: 149.

Would that qualify for a VLQ?
 
@SirCumference I'm being "harsh" because apparently more subtle hints do not go through to this user. I think you lack a bit of context here (that I don't want to bring up again).
 
12:02 PM
@Yashas Definitely
 
^^^ Didn't Feynman talk about that? (Volume one, Gravitation)
 
Also as "not an answer" since it does not remotely address the question
 
@Yashas Yes, absolutely and without any doubt
 
It was an attempt to answer the question :/
VLQ flags are hard
 
@Yashas It's not even related to the question
 
12:04 PM
hmm
 
OP asks about stellar and galactic structures, answer talks about the age of the Universe
 
Hey @0celouvskyopoulos
 
12:05 PM
This one's amusing:
in The Periodic Table, 17 hours ago, by orthocresol
You should flag one of those two as a duplicate of the other.
 
I see you're making ACM mad
 
@0celouvskyopoulos Apparently he/she's prone to it :(
 
0celo is ACM, confirmed
3
 
AHA!
 
I knew it
 
12:08 PM
@ACuriousMind can we do something about this guy?
 
.-.
Sigh
 
Easy, we're all friends here
 
@0celo If that was offensive, I sincerely apologise and I shall retract the comment at the earliest.
Wags tail
@0celouvskyopoulos I desire not to agitate thee further and shall hence refrain from grouping thy presence with ACM's.
Wags tail again
 
lol
 
@SirCumference, I will give you some contents. Please classify them as classical.physics and modern physics!
 
12:14 PM
o_o
 
Pats @Sir .... good luck ;)
 
If there relevant concepts today, they're probably modern
 
@Aryabhatta Have Indian schools started asking such questions now?
 
@Yashas, They are not asked. I just wanted to know, where they fall.
 
12:16 PM
"Fall"? That's gravity then.
Discussion closed
 
@Aryabhatta Just read a Wikipedia article on modern physics
 
^Brilliant
Applauds
 
@SirCumference, so where do you classify current electricity and magnetism?
 
@Slereah Wanna hear a pun?
 
Did you just ignore what I said...?
 
12:19 PM
2 mins ago, by Sir Cumference
@Aryabhatta Just read a Wikipedia article on modern physics
 
@Aryabhatta classical
 
...
Um...that's ambiguous ._.
 
@Aryabhatta Both
 
^_^
 
@Aryabhatta If that was an MCQ for an Indian school test, then mark Classical instead of both because the Indian HS teachers are nuts.
 
12:25 PM
What is SR and GR? Classical or modern?
 
@Aryabhatta Modern...
 
@ACuriousMind Have you heard of this before? If $f$ is harmonic, then $\Delta |\nabla f|\ge 0$.
 
Dude, just look up modern physics
 
The theory of relativity usually encompasses two interrelated theories by Albert Einstein: special relativity and general relativity. Special relativity applies to elementary particles and their interactions, describing all their physical phenomena except gravity. General relativity explains the law of gravitation and its relation to other forces of nature. It applies to the cosmological and astrophysical realm, including astronomy. The theory transformed theoretical physics and astronomy during the 20th century, superseding a 200-year-old theory of mechanics created primarily by Isaac Newton....
 
I'm concerned because I can't prove it and because $|\nabla f|$ isn't even $C^2$.
 
12:27 PM
@Aryabhatta Pull your head outta the sky and give that a read ;)
 
trivial @paracetamol
 
Aryabhata (Sanskrit: आर्यभट; IAST: Āryabhaṭa) or Aryabhata I (2765–2691BCE) was the first of the major mathematician-astronomers from the classical age of Indian mathematics and Indian astronomy. His works include the Āryabhaṭīya (2742 BCE, when he was 23 years old) and the Arya-siddhanta. == Biography == === Name === While there is a tendency to misspell his name as "Aryabhatta" by analogy with other names having the "bhatta" suffix, his name is properly spelled Aryabhata: every astronomical text spells his name thus, including Brahmagupta's references to him "in more than a hundred pl...
@0celouvskyopoulos Meh
 
Is BCE = BC?
 
@Yashas Yeah
 
12:28 PM
@0celouvskyopoulos You have no idea about what this guy's been asking our friend @Pies here XD
 
I wish there was someone born in 4000BC
 
@Aryabhatta Now read the article
 
@SirCumference ...
What the f*ck?!
 
wot happuned?
 
@SirCumference Did you read that article? X'D
@Yashas Yeah
 
12:29 PM
@0celouvskyopoulos No, I haven't heard that
 
@paracetamol Why?
 
Countries that are trying to be overly secular replaced "Before Christ" with "Before Christian Era" -_-
Sighs
 
@yashas, @SirCumference, @paracetamol, why does the wikipedia article says it is Classical
 
@Yashas Plenty of people born then. They're just all dead now :P
@paracetamol It's "Common Era", not "Christian Era".
 
@SirCumference Did you? :D
@ACuriousMind Really? O_o
 
12:31 PM
@ACuriousMind I actually wanted to say I wish there was someone born in 4000BC and we had evidence of it :P
 
@Aryabhatta Dude, it clearly says that the definition of classical depends on the context
 
@Yashas I'm pretty sure we should have unearthed remains of people from around that time.
 
When did the Pompeii incident happen?
 
@ACuriousMind yup but that doesn't help the Creationists
 
No, but that doesn't mean we don't have evidence. It just means they choose to deny it.
 
12:33 PM
@Yashas There're other things that support Creationism ;)
 
0
Q: Is it possible that everything in the universe is a manifestation of a gravitational field in one form or another?

crackpotsoupSuppose the fabric of the universe is all there really is to the universe and it is all just a gravitational field with dynamically varying density and configuration that appears to us as everything from space to radiation to black holes.

o0
 
I don't get why people try to separate science from religion :/
Shakes head
 
@paracetamol because both are not compatible with each other
 
Yes they are!
Adamant expression
@Yashas Maybe you aren't looking hard enough ;)
 
@Yashas That's...not a debate we're going to resolve here, since it has raged for hundreds of years.
 
12:37 PM
It should be pretty obvious...for someone from a Bio. background that is ;D
Two words: Intelligent design
 
And given the strong emotional investment both sides of that debate commonly show, I'd urge you to consider carefully if you really want to bring that up here.
 
I'm sorry.
 
@ACuriousMind 0;)
 
@Yashas No need to be sorry, I'm just advising caution
 
Rubs hands in anticipation
 
12:40 PM
Is there an actual definition of a measurement, if you take two quantum systems and define one as the observer
 
Quietly loads a .44 Magnum
 
Like if you have two quantum systems, how do they make a measurement baby together
 
@Slereah What does "define one as the observer" mean?
 
Cocks Magnum
 
Loads a gravity gun
 
12:41 PM
@ACuriousMind Well for instance if one of the quantum system is a dog
 
...
 
And the dog observes something
 
@Yashas HL2 is a great game
 
o_o
 
Or an atom, whatever
 
12:41 PM
@ACuriousMind That's where I got that word from :D
 
The gravity gun got nothing on the portal gun, though ;)
 
HL2?
 
when does the "measurement" happen, without going with "observers are too big to be quantum" rigamarole
 
@paracetamol Half Life 2
 
Oh o_o
 
12:42 PM
@Slereah You're asking for a resolution of the measurement problem, no? That strongly depends on your interpretation.
 
@ACurious @Yash You guys do Red Crucible (Firestorm)? :)
 
I only play science fiction games not war games.
 
War is not good.
War is for the fools with low IQ who don't understand that all humans are humans.
 
12:44 PM
ARMA With the Day Z mod is pretty good :3
 
that's a pretty r/iamverysmart thing to say
 
@0celouvskyopoulos :D
@0celo What about you? You play RCF?
0:)
 
It's perfectly possible to think of all humans as humans and still not care
 
There are 4 year old African children who are dying due to starvation but we have countries bolstering military to kill people of another country who have been fed well.
@0celouvskyopoulos I am dumb.
 
^ That's...deep/not-so-deep
@Yashas Sure, now go and tell that to Pakistan ;)
 
12:46 PM
@Yashas Dont be so simplistic, smart people can also go and have gone to war. Moral philosophy is full of smart people with justifications for war under certain circumstances. Acting as if morality is easy if you're smart is not very helpful.
 
I'm sure they'll all drop their arms in tears XD
 
If everybody is smart then there wouldn't be wars.
 
...and maybe they'll finally stop hiding terrorists...
 
People would understand each other and help each other.
 
@ACuriousMind Tall order, I know!
 
12:49 PM
@Yashas I...don't know how to say this but that's just not true. Intelligence does not correlate with empathy, and empathy does not always mean you actually act on it. Being "smart" does not somehow remove messy human nature from the equation
 
But do any interpretation actually say it
 
@ACuriousMind True that ._.
 
Especially for QFTs, since they're basically always interacting to some degree
Most texts leave the "measurement" part rather ill defined
 
@Slereah Well, e.g. the operationalist doesn't make any claim as to where "measurement happens", the question doesn't make sense in that framework as I understand it. You have a setup, it measures something, you predict the outcome - "how" does not enter into it at all.
 
Let's go with like relational quantum mechanics
 
12:52 PM
Well, there you're on your own ;)
 
You have the wavefunction of an observer, and the wavefunction of a system
Let's say it's two charged fields
When are they "measuring"
 
@ACurious Speaking of war... have you ever read Clausewitz?
 
I want QM to make sense
Is that so wrong
 
@Slereah Once again, that depends on your interpretation ;)
 
Well what interpretation actually has an answer for that
Relational should, or many world
But they leave the measurement a bit vague
 
12:55 PM
@Slereah Well, it'll deprive countless Publishers of their jobs...apart from that, not really ^_^
 
@Slereah yeah, well, join the back of the queue
 
Is there measurement for as long as one charge is in the chronological future of the other???
Also is that measurement discrete or continuous?
I mean, if it's the same measurement, I guess it doesn't matter
Since it leaves the eigenfunction the same
But I want to know
 
@Slereah I actually find the question to be not-that-relevant
you have two systems
the system
and the detector, which is also a system
they interact
they get entangled
they separate and never come into contact again
then at some point the detector gets "projectively measured"
but at what point that happens is irrelevant
as far as the system goes, all that matters is the entanglement
 
maybe from an instrumentalist point of view
 
no, from a more fundamental perspective as well
 
1:00 PM
But also what condition does the system have to fulfill to be measured
If two systems cannot interact, I assume they can't measure one another
 
as far as any local operators go, an entangled state is as good as a projectively-measured state
this is roughly what I'm talking about
 
And also when are the systems no longer interacting
Surely two charges always interact, although they may interact with states at different points in time
 
If I understood correctly, you seemed to have a similar conception on when is the interaction of two things become so (inset word) that it becomes a measurement

which operationalist does not provide an answer for that, many worlds just push the question into one where the universe splits as the universal wavefunction evolve (and does not give any criteria for the split to occur other than it is part of the hamitonian)

What Emilo is talking about here is a (forgot name of the interpretation) that is similar to what Suskind said in his theoretical minimum, where the system and the device be
 
it's obvious that my department is run by engineers and military guys
I have to fill out fucking paperwork because other paperwork isn't processing quickly enough
 
The thing that bothers me is mostly that it doesn't even seem to get discussed
At least not that I can see
 
1:12 PM
Could there be another explanation of the QM related phenomenon which is intiutive?
 
No.
I think we're way past intuitive
Also how can you even define a system in QFT
 
Anonymous
@ACuriousMind Touchy topic :P. I'd like to point out that when you say: "Intelligence does not correlate with empathy" I think you meant IQ only. Empathy is a part of Emotional Intelligence which many people lack despite having high IQ.
 
Shouldn't you be working on your book?
 
I am
The interpretation of QM is important for quantum computing with CTCs
There are possible differences between many world and "single universe" interpretations
Also CTCs fuck up QM big time
Causality is a pretty big break in QM
There are Consequences
But unfortunately that means delving into the murky waters of quantum measurement
 
I thought post selection already mop up most things about time travel in QM in that you can always guareentee the outcome is self consistent?
 
1:25 PM
It's fairly hard to define with CTCs since measurement in QM is mostly not defined in terms of something deterministic
Hence why I ask under what condition a measurer and a measuree perform a measurement
otherwise when does someone measure
who measures the measurer
It is a mystery
An observer measures a system once, he saves the information, goes round the CTC, measure the system once more
What the hell is going on
No clue
and of course, quantum point particles make no sense in the context of GR and Copenhagen, so using them is already risky
I don't know if MWI admits relativistic point particles
 
This is either a sign that QM or CTCs are BS. I'm not sure which is more likely.
 
could be both
This may require a PSE question
Although I'm guessing I will get a lot of answers not answering the questions
Risky move
 
Do those ever get good answers?
 
It happened sometimes
0
A: How to deal with boundary conditions for path integrals?

SlereahHello handsome poster (why thank you kind stranger). The answer to your question it turns out is in Rovelli's "Quantum Gravity", at least insofar as the free scalar field is concerned. This is done in the following way. As you may recall (from Feynman and Hibbs), through various arguments about d...

This was a pretty good answer to my question
 
If an observer measures a system once, it projected to some eigenstate A. He save this information, goes around the CTC, measure the system again. Then in order to ensure self consistency, the outcome will always be A?

Put it in another way, suppose we let the measurement thing to be part of the evolution that happens to evolve the quantum state arbitrarily close to an eigenstate at some time $t'\in [0,T]$, then we could wrote:

$$\lvert\psi(t)\rangle=U(t,t_0)\lvert\psi (t_0)\rangle$$

and then we could demand that $\lvert\psi (0)\rangle=\lvert\psi (T)\rangle$ as the boundary condition of
 
1:36 PM
What if the decision to pick a measurement depends on the state it was left in during the last loop on the CTC
Fugg I don't know
After review, I think I only got two satisfying answers by people who weren't me to my questions on PSE
The question regarding the non-time orientable spacetime, and the one about the 7 Killing vector spacetimes
 
1:50 PM
@Slereah "7 Killing spacetimes" Wow, physics gets pretty metal sometimes
 
that it does
Wilhelm Karl Joseph Killing (10 May 1847 – 11 February 1923) was a German mathematician who made important contributions to the theories of Lie algebras, Lie groups, and non-Euclidean geometry. Killing studied at the University of Münster and later wrote his dissertation under Karl Weierstrass and Ernst Kummer at Berlin in 1872. He taught in gymnasia (secondary schools) from 1868 to 1872. He became a professor at the seminary college Collegium Hosianum in Braunsberg (now Braniewo). He took holy orders in order to take his teaching position. He became rector of the college and chair of the town...
The Killing man himself
 
"As a professor and administrator Killing was widely liked" what an unfortunate name.
 
My gf's dentist is Dr. Rape
 
@blue This is an oversimplification of the concept of human intelligence.
 
@BalarkaSen you're late to the party
 
Anonymous
1:56 PM
@BalarkaSen It is. Yes.
 
Reddit is giving me female underwear ads
:(
 
I know what to get you for Christmas then
 
Anonymous
@0celouvskyopoulos Doesn't reddit shows ads based on search history and type of posts you view ? :P
 
@blue If you do agree, then you are constructing a utopia in which "intelligence" has a meaning for which intelligent human beings always strive for mutual existence. This has been done before, and none of them has been decisively consistent.
 

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