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00:00 - 18:0018:00 - 00:00

00:00
@NeuroFuzzy always flag
@ACuriousMind I might switch it up and go for a non-rap cover
well, okay, don't always flag, but with respect to the "equilibrium" between flagging too much and flagging too little, you are very far on the side of too little
The Pinkprint's album cover reminds me of period blood, yuck
Do I want to know how period blood differs in your perception from, well, blood?
@ACuriousMind nonliquid bits.
00:01
@DavidZ Haha, sounds good.
@ACuriousMind It just occured to me that not all rap albums have that sticker
@DavidZ Are there actually users flagging too much?
Wonder how they arrange it get it taken off
(please don't say it's me...)
@ACuriousMind it's happened once
but currently, no
00:04
@ACuriousMind ...we're talking about the site, not chat, right
@0celo7 Yes, we're talking about the site
I can see 3 albums in my collection that do not have the parental warning
strange
anyone know about American music rating laws?
Are they actually laws, and not "self-imposed regulations"?
make that 6
Neither of Macklemore's albums
I know there's some sort of distinction between that here, and very few of the advisory labels are actually required by law
00:06
Kendrick Lamar's first album
Kanye's latest
Watch the Throne
@0celo7 Oh, I loved "get thrifty"
^ by Kanye and Jay Z
Oh, Yeezus doesn't have one either
So some of Kanye's do and some don't.
Strange.
@0celo7 Why's that strange? Shouldn't it depend on the content, not the...erm, artist?
@NeuroFuzzy Do you mean Thrift Shop?
@ACuriousMind Watch the Throne has a song called Niggas in Paris and does not have the sticker.
The content is definitely not family safe :P
I...see
00:08
(that song won a Grammy btw)
I wonder if it's a digital download thing
One of DJ Khaled's albums doesn't have it...time to investigate.
@ACuriousMind You're right, it might be a self-regulation thing because 2 Chainz' latest mixtape (free download) has the sticker.
Huh, it's voluntary.
So why would anyone put it on?
@NeuroFuzzy I think my favorite song of Macklemore's is Can't Hold Us
@0celo7 Because people like buying stuff that's "forbidden"?
@ACuriousMind ...that's ridiculous
Not that concept
@0celo7 Yes, people are ridiculous :D
But rap is certainly not "forbidden"
All it does is ruin otherwise great album covers
@0celo7 I didn't mean forbidden, I guess - but you might feel, on some level, edgy buying stuff that's unsuitable without parental advisor? I dunno. Perhaps it's just so the people putting it on can feel like they're bad boys :P
00:17
@ACuriousMind I feel like a bad boy when I blast this stuff at levels that scares little old ladies.
@ACuriousMind I don't know if that's true
what does the German label look like?
vzn
vzn
@0celo7 did you hear his latest (publicity) stunt? hes ("stooping to"?) tweeting requests to be sued... o_O thedailybeast.com/articles/2016/06/25/…
@0celo7 I don't think we have one, but I'm not sure
@ACuriousMind Does Big Milnor talk abut homotopy stability at all?
@0celo7 I don't think so
But I might be wrong
@ACuriousMind Well I'm (trying) to prove homotopy stability right now, it's on my problem set for some reason
00:26
@0celo7 Thinking of it, we have such labels for movies and games, but I can't recall if there are any on music
@ACuriousMind everyone has them on movies and games.
But here they're mandatory on movies and games
@ACuriousMind Sound familiar?
I guess so?
@0celo7 I guess they are kind of mandatory here, too, but I don't know exactly
@ACuriousMind What's the precise statement of "if $f(x)>0$ then $f>0$ in some neighborhood of $x$"?
$f$ is continuous
@0celo7 what's not precise about that statement?
@ACuriousMind I need it to work about a compact set $K$
If $f$ is positive on this compact set $K$
00:33
@0celo7 That doesn't answer my question.
@ACuriousMind I ask questions badly, we've covered this
I'm wondering if there's a generalization.
@0celo7 Well, if you have that $f > 0$ on a set, then you can use this for every point of the set to get $f > 0$ on the union of these neighbourhoods
@ACuriousMind Ah, very good, thanks.
01:16
@ACuriousMind Interesting, my proof of the Morse stability theorem does not use homotopy stability at all.
 
1 hour later…
02:31
@dmckee Enjoying your summer?
Teaching summer class, so it's more work than vacation, but yeah.
@dmckee Well I'm taking summer classes (willingly)
Teaching anything good?
@0celo7 FIrst semester algebra/trig based. For the pre-meds and similar.
That can be fun if the students get into it, but not many are this semester.
Sounds like my statics class
Problems are like:
FIVE COUPLES IN SPHERICAL POLAR COORDINATES
Not very interesting.
@dmckee Is there some psychological reason why I don't like updating stuff
It's literally clicking a button
But I always make them go away
03:31
@ACuriousMind Hey what's Noether's theorem for Hamiltonian mechanics
user116211
@ACM changed his profile pic.... and so did @0celot.
correct
user116211
@dmckee Isn't that boring? hmm.
vzn
vzn
05:31
> “I kind of intensely do different things,” she says. “If I spend too much time doing the analytical physics side, I’m, like, gasping for oxygen.” Research, she said, “is not about drawing within the lines. It’s about discovery and creativity.”
user116211
Is something that doesn't happen reversible? That depends on the meaning of "is", doesn't it? MWI is what happens when someone with a failing intuition for physics comes up with an idea that appeals to other people with failing intuition. — CuriousOne 2 hours ago
user116211
The measurements in QM are self-evidently irreversible motls.blogspot.com/2016/05/… as logical steps and whatever is claimed to replace them must be irreversible as well. What the MWI advocates say is that they "want" some "theory" or "interpretation" that is completely reversible but it's obvious that nothing of the sort may exist. No "MWI theory" exists mathematically - it's just a collection of propaganda and wishful thinking. Irreversibility is a nice window to see that all realist replacements for QM must be wrong. — Luboš Motl 20 mins ago
user116211
Hey @vzn.
vzn
vzn
> The teams have independently created two new computer codes they say will lead to the most accurate possible models of the universe and provide new insights into gravity and its effects.
@MAFIA36790 hey... so are you a "lumo" fan?
user116211
05:43
@vzn Everyone likes Lumo ;))
vzn
vzn
@MAFIA36790 does anyone know, does he have a day job or is he just a full time physics blogger now?
user116211
@vzn I really don't think so; he left Harvard quite a long ago and presently he is doing nothing, I assume.
Okay, I've just had a thought in regards to those quantum particles or whatever that can only be in one of two possible states, are both prior to being observed, and end up locking themselves in one of the two after being observed.
I figured this might be the place to ask
Is it?
user116211
@user1337 possibility turns to actuality.
Wat?
vzn
vzn
05:49
@user1337 great choice of area to study (bell experiments/ nonlocality etc) but "locking into a state" sounds like a video game.
Guess where I picked up the lingo.
vzn
vzn
@MAFIA36790 "oh how the mighty have fallen"
I am by no means a person who knows enough about physics to say anything beyond stating the obvious. I do 3D graphics; I hope that explains my position more than enough.
It's just something that sprung up during my insomnia-induced train of thought.
user116211
@vzn: Last year, Lumo came to Bengaluru to attend the Conference on string theory.
vzn
vzn
@user1337 always looking for ppl interested in this subj for deeper analysis. drop by sometime for more dialog, there is at least 1 other dude intermittently appearing whos delved fairly deeply into it. chat.stackexchange.com/rooms/9446/theory-salon gotta crash myself right now
05:53
Thank you.
vzn
vzn
@MAFIA36790 havent read his musings/ pov on string theory, am sure he has some, but still sounds like it might be a weird juxtaposition him at a strings conference... aka "just asking for trouble" :o
user116211
hmm.
Well, he's gone. I suppose I'll rummage elsewhere.
user116211
@user1337 He will come if you ping him ;)
Eh, I'd rather not.
Well, g'day I suppose.
 
3 hours later…
09:36
THINKING ABOUT IT
I would only need to remove one point from the manifold to remove closed null geodesics from the minkowski wormhole spacetime
Well, not quite
There are geodesics that are not closed but have a point of intersection
09:49
Those I can also remove with a slightly extended cut, I think
10:02
@0celo7 Homotopy stability is continuity of $df$. Morse stability is continuity of $d^2f$, the Hessian.
The proof of the latter need not use the former, certainly.
Hey, @yuggib, do you speak AQFT
"No "MWI theory" exists mathematically - it's just a collection of propaganda and wishful thinking."
Oh Lumo
10:31
@Slereah not so much...I know only some basic stuff
Aw
Trying to understand what phase space conditions are supposed to mean in AQFT
phase space conditions?
yeah
user116211
@Slereah He ALWAYS speaks the truth.
It's...
How to explain
Does this mean anything to you
10:39
no, but I suppose it is related to the causality condition for nets of observables
I seem to vaguely recall that it is related to the state being "compact" in the phase space, in some way
Not quite sure
I can't find any paper on it not written by madmen, though
AQFT is essentially not physics
;-P
yeah, there isn't a lot of it written by physicists
I doubt that any really interesting physical result has been obtained in AQFT
Well AQFT is apparently used somewhat often in QFT on curved spacetime
And actually the theorem that includes the phase space condition is a novel one
Basically it states that under some conditions, all eigenvalues are bounded for some operators
(It is related to the energy conditions)
10:44
yeah I can believe it is a novel theorem; I doubt it has interesting physical applications ;-P
At least I think that's the theorem
^a bit of a hard read
Well bounds on operators is a good proof of quantum inequalities
without context, it's unreadable ;-P
Trust me
Even with context
It is
probably :-D
Even reading the conclusion it's a bit hard to discern much
"We have shown that quantum field theories obeying the microscopic phase space condition of [Bos05b] admit a large class of nontrivial quantum inequalities: to every classically positive expression, i.e., a sum of absolute squares, we find a combination of composite fields that is positive up to an error obeying defined estimates and vanishing in the short distance limit."
11:11
But basically it seems to be that any classically positive quantity will be also positive in AQFT, up to some function
And since it is vanishing in the short distance limit, and that $\hat T(x) \approx \lim_{x \to y}f(D(x,y))$, I assume this means that the quantum inequality holds for all those states
So I assume that states that break that do not obey the phase space condition
Not quite sure what part, though
11:27
i dont think its enough content for a question, so just a quick survey here: is there a name for the (mathematical? physical? statistical? "sciency"?) concept that predictions are more likely to be inaccurate the further they try to predict the future? like weather, etc.?
Chaos
If you have two sets of initial conditions $x_0$ and $y_0$, with $x_0 - y_0 \approx \epsilon$, then you can calculate the dependance of the difference between the predictions on $\epsilon$
Basically what chaos theory is about
oh okay... so my gut was right - maybe i confused myself there
thanks! :)
12:06
@ACuriousMind orly
13:00
@ACuriousMind Is Ado's theorem a black box?
13:23
You know who has a hard job?
Pop science illustrators
Their editor is like
"Oi!" (I imagine it's a Cockney editor)
"Draw me a spaceship that would look like it could be that spacetime metric!"
and then
@0celo7 Not exactly, but the proof is a bit length. Terry Tao fit it into one blogpost. And I don't think that it's that useful a theorem anyway, one should prove things about Lie algebras in Lie theory, not things about matrices :P
"Put on more light effects!"
@ACuriousMind Begone math goblin
Let's have a contest of the prettiest spaceship drawn on the Alcubierre metric
Krasnikov tube has a lot of light effects
@Slereah math orc, please
Hey @ACuriousMind, can you read this AQFT
Not a clue what that says
IT appears to have been written in some sort of code :P
13:42
Yeah AQFT is basically like sociology
They feel obligated to make it completely impossible to decypher
I would tell you what each term means but to be frank I'm not sure
I'm 70% sure that $\mathfrak{A}$ is the C* algebra, but that's about the extent of it
$\sigma$ might be a spacelike hypersurface but so far I have not found where the papers confirms it
@ACuriousMind Working on the silver
Oh wait
Apparently $\mathfrak{A}(r)$ is the algebra for the double cone stemming from a ball of radius $r$
Alright one thing decyphered
Now to do $\Xi$ and $\psi$
14:33
@Secret is that your website mu6.com/paradox_basic.html
14:50
@Slereah Obviously not, mine is this one: secretuniverse.wikia.com/wiki/Secret_Wiki
Other things that suggest I have never came across that website until now is that I never mentioned anything about cosmology and paradoxes, and that from what all of you know, my major focus is time travel, mathematics visualisation and quantum mechanics research
@Slereah Out of curiosity what makes you think mu6.com is my website (other than perhaps the obvious thing that the author somehow use a lot of pictures that winds around)?
There's also one more reason why that is not my website: do you noticed (search the h bar chat log for details) that I always refrain from talking about the topic of consciousness and never mix consciousness with quantum mechanics (or anything else)? (except for that one instance is responding to a question that JohnRennie posted about)
(I don't think he really believed that is your website, please don't go overanalyzing this again...)
In the case that I cannot tell apart a joke from a real thing, a real thing is assumed, to be on the safe side (you know how bad I am still at recognising jokes despite having been in this chat for at least 3 years)
In particular, despite the stars, slereah's tone above does not seemed like joke to me
@acuriousmind is that a warcraft picture or something
@Obliv It is Thrall from WC3 indeed!
(I ran out of pure RPG characters :P)
lol. will you be seeing the warcraft movie when it comes out?
oh it's out already
15:05
@Obliv Isn't it out already? (And no, I don't want to see it)
[Progress report]I am halfway through Tanmath's recommended book:
currently investigating some entangled 2 spin states by computing expectation values
that's a cool idea you have on your wiki page @secret didn't you get a phd in math though?
@obliv Nah, that wiki is actually a scifi wiki, thought because of trying to perfect suspension of disbelief, all the physics are written using as consistent laws as possible (mostly refer to real life physics)

And nope, I have no start my phD yet, my phD will start in 2.5 months time (and it will be chemistry (metal complex catalysis))
h barer should have know how much effort I have put into that scifi wiki when they noticed how I try to create a time travel model that unify all known time travel narratives into a single mathematical framework (except a bottleneck was identified thus the project is currently shelved)
My wiki do get a lot of visitors for the magnetic monopole and negative mass articles probably because I refer to real life physics there in the bibliography
(though at that time, I am not knowledgable enough to filter crank articles form arxiv)
oh cool. That's a neat idea. Although, if it is ever aimed at the general public, I don't think suspending disbelief will be a problem. Sometimes reality is surprising enough to invoke disbelief in an audience. Other times they can't tell if it's real or not (like in interstellar) so they just go with it. @secret
Is it possible to define a regulator that does not reduce to the same observables as the usual regulators
Or do all regulators work the same
Schwartz is pretty good for renormalization btw
15:21
@obliv Currently the scifi wiki have 3 major branches I am trying to explore:
Science (where the physical stage of the fiction is accurate down to the single atom and any fictional laws are self consistent)
Magic (obeying consistent laws, fit folklore description of all known types of magic and socery. Soem plans on trying to get them to interact with the science component to get something interesting)
Religion (There are currently 3 ideas in the pipeline, but I have not explored them fully yet)
So my passion for general relativity (stripping apart the fact I like weird spacetimes) is really a conspiracy, because I mostly like general relativity because it is so important in the settings of The Wiki

My pssion for quantum mechanics is more genuine, because I am truly passionate on the weirdness itself and want to study further
The minimum requirement to complete The Wiki is a group that has the capacity of at least 100 times Wikipedia's
You basically need to use every single knowledge known to men to complete it. This is why there is almost no updates in it (and basically look in a deserted state)
@secret whoah what do you mean 100 times wikipedia's?
He is a madman
That's what
100 times the current number of infromation in bytes in wikipedia
@secret wow that IS ambitious
and ideally, all this information in one brain
15:26
what..
Wtf are you people talking about
@0celo7 is that g-eazy or logic in your picture
Last time I checked the full wikipedia was about 30 terabytes, IIRC
this is one of the drives for me to learn very broadly (besides mere curiosity), know a bit of everything in the process (and possibly deepen the learning for some fields). Because the reality as we know it is key for me to complete The Wiki
Possibly gigabytes, I forget
15:28
@slereah actually it is possible to store that in someone's brain. The brain has way more capacity for information iirc
2.5 petabytes
Eeeeh
so ya, I am really a madman aimming for unrealistic goals...
so like 2500 terabytes? I think
I would not speak of the brain's memory capacity directly in those terms
The brain is a neural network, not a state machine
so then how can people assign memory to it?
15:29
It's hard to really compare the memory capacity of both
vzn
vzn
@FlorianPeschka try butterfly effect or lorenz system
Well you can assign it by doing ~ number of neurones * number of connection per neurone
so all @secret has to do is figure out a way to upload people's brain into a machine.. then he can store it manually.
It's a bit of a misleading number though
vzn
vzn
3
Q: Which is the equivalent processing of human brain in terms of computer processing?

ClausiaHow many flops my brain can process, or how many GHz is a human brain capable of? Is it valid to think that each celular brain is like a small cpu? (like cuda architecture). Our brains works in parallel, right?

15:31
@Obliv G
@vzn that's incredible.. seriously our brains are monsters
Anyway...back to more sane stuff. I am going to ask h bar about entangled states soon after I complete my analysis
vzn
vzn
@Secret did you do a masters?
@Obliv human brain one of the last great mysteries of science/ universe but there are hopes it might finally be "unravelled" within next ~2decades
nope, my uni said that after doing an honour,s one can go strati to phD for chemistry, physics and some branches of life science
vzn
vzn
@Secret way cool did you do an honors thesis? what country are you in?
15:35
My point is basically that if you want to store an integer, you can't just assign that integer into a neuron in a brain
It corresponds to a pattern
Australia. My honours thesis is "Investigation of hydrogen production in the ketene channel of actealdeyde" (I just finsihed that this year)
vzn
vzn
@Obliv talk to kurzweil about that :P
And of course those patterns will not stock the same way if you add them up
In a neural network, if you add a lot of information of the same "type", it will add up a whole lot easier than if their patterns are very different
So it's a bit hard to really make a correspondance in terms of raw memory
in brief terms, my thesis is about using laser experiments to photolyse acetaldehyde molecule in order to figure out the mechanism of hydrogen production from the photolysis
although you can compute bounds, of course
vzn
vzn
15:37
human memory & computer memory are of course vaguely similar and very different, it shows an overloading of the term "memory"... its something of a mere analogy...
We also did some quantum chemistry computations, such as finding transition states for the previosly undiscovered ketene channel
Thus in short, my honours project I have just done is a physical chemsitry project
I suspect that the human brain is actually not that efficient at memory storage
and that invole quite a bit of quantum mechanics
Compared to a von Neumann machine
But it is much better at pattern recognition
vzn
vzn
@Secret (reading wikipedia) "may be a contributing factor to hangovers from alcohol"... :o
15:39
It is, but in the atmosphere, it is also a major source of photochemical smog
and also aerosols from plants
vzn
vzn
yeah just read its in air pollution. classified as carcinogen!
Acetaldehyde smells plastic watery..., not a very good smell
In addition to that, my honours project found that acetaldehyde might be a major source of photochemically produced hydrogen
via the newly discovered ketene channel
@slereah I see what you mean. Storing memory is much harder for a brain than in a computer. Just by reading a wiki page the brain can't store all of the information somewhere. Doesn't it determine which information is valuable or not? Or is that with working memory
vzn
vzn
@Obliv try reading up on hippocampus and long term vs short term memory in humans. sleep involved in converting former to latter.
@ACuriousMind Where does one traditionally first learn about categories?
The basics
15:45
don't you mean short->long @vzn?
Like what a category is, what a functor is
vzn
vzn
@Obliv right
@0celo7 I don't think there is a "traditional" place, unless your university offers a dedicated course about it
You'll encounter them when you need them. Which is often in modern formulations of homological algebra.
But if someone wants to make precise what's "natural" about a "natural map", you might see it far earlier
[Sneak peek] My first entanglement question will make use of this diagram, which coincidentally, resemble a commutative diagram (all operators are as defined in Susskind's book)
and the investigation that is behind the coming series of question concerns about trying to figure out how tensor product elements give rise to correlations in the observables, and hence mathematically how entanglement arises
(I am currently computing expectation values of the spin component operators of Alice and Bob for a variety of entangled states)
My hypothesis is that because the basis vectors of the entangled state involve the tensor products of two subsystems, the tensor product might somehow introduce a correlation between the two subsystem, allowing entanglement to occur
16:05
Hi all
To show that the position operator, given by the eigenvalue equation $$\hat{R} |r \rangle \ = r |r \rangle$$ is Hermitian I have shown that: $$\langle \phi| \hat{R} | \psi \rangle =
\langle \phi| \hat{R}\big( \int d^3r |r \rangle \langle r | \big)| \psi \rangle = \int d^3r \langle \phi| \hat{R} | r \rangle \langle r | \psi \rangle = \int d^3r r \langle \phi| r \rangle \langle r | \psi \rangle = [\int d^3 r r \langle \psi| r \rangle \langle r | \phi \rangle]^* = \langle \psi | \hat{R} \ |\phi \rangle^*$$
@JohnDoe Yes
Okay thanks, just wanted to confirm that,
@ACuriousMind So in algebraic topology?
Can someone explain how $\langle x^m \rangle = \langle x^{|m|} \rangle$ is true? ($|m|$ denotes absolute value of $m$). I understand the order may be the same if there exists a bijection between these cyclic subgroups of $\langle x \rangle$ but I don't think they're the same subgroup..
$m \in \mathbb{Z}$
@0celo7 Again, that depends. Algebraic topology can go a long way without having to introduce the full machinery, I saw it first in abstract algebra when defining Tor and Ext through the notions of derived functors.
@Obliv $x^m\in \langle x^{\lvert m \rvert}\rangle$ and $x^{\lvert m \rvert}\in\langle x^m \rangle$, so they are the same group.
16:16
How are you certain @acuriousmind ? how can positive powers of $x$ generate a subgroup that is generated by negative powers of $x$
like $\langle x \rangle = \langle x^{-1} \rangle$
is that true
Yes, I just said that it is!
Again, because both $x$ and $x^{-1}$ have to be in both groups.
oh yeah..
I was thinking the inverse was the order of $x$. inverse $\ne$ order right @acuriousmind
nvm
The inverse is a group element. The order is a number. How could they be the same?
16:21
not sure. but I thought since the element raised to the order was the identity it could pass as an inverse :P
Is there any theoretical reason to believe that the Casimir energy density is not negative
Like
We know what the cosmological constant is
Is there a reason to believe that the Casimir energy does not dip below 0
@Slereah I'm not sure I understand the question
@ACuriousMind The orthonormality condition $\langle r| r' \rangle = \delta(r - r')$ of the basis which consists of eigenkets of the position operator $\hat{R}$, is this just defined in this way or is it derived from something else?
The Casimir energy is usually derived to be negative, no?
@ACuriousMind Well we know that from QFT, the Casimir energy dips below the vacuum energy
But of course, this is not guaranteed to be 0
Only if renormalized
But then we also know, at least, the cosmological constant
The cosmological constant can be a combination of various effects, though
16:30
@Slereah And does arbitrarily so where the plates come closer
There's no limit on it
An actual cosmological constant, the vacuum of the various quantum fields
@ACuriousMind Well there is, if you don't assume like
Perfect conductors infinitely thin and infinite in size
I'm wondering if there is any reason to doubt the assumption that Casimir violates the NEC
@JohnDoe It is derived, but the rigorous formulation of that requires lots of machinery, because you need to say what exactly the $\lvert r\tangle$ are in the first place.
at least for realistic systems
@Slereah But these "realist" constraints have no connection to the cosmological constant
Sure, but like
The total measured cosmological constant is very small
Like 0.7 or some shit
But it could be something like
16:34
@ACuriousMind Oh okay, so they just state it in introductory books so as to avoid arguments which are too long and advanced.
$$\Lambda_{m} = \Lambda_0 + \langle H_{\phi_1} \rangle + \langle H_{\phi_2} \rangle + ...$$
@Secret All the best chemists are physical ones.
Where $\Lambda_0$ is a constant of spacetime
And the vacuum energy of the various fields could be very large, with $\Lambda_0$ very negative
So that it is irrealistic that any effect would actually go under 0
@Slereah ...and that would mean you have just introduced a gigantic host of fine-tuning problems
I know right
But then it would mean that, outside of the lambda term, nothing could actually violate the NEC
16:37
I'm not sure I follow
Why does the NEC care about the $\Lambda_0$ instead of the $\Lambda_m$?
Hm
Well that is kind of why I was asking
Or rather, why should the Casimir be relative to the $\Lambda_0$ and not the $\Lambda_m$?
Because I often read that the various effects that violate the NEC are not guaranteed because they are only smaller than the vacuum energy, the value of which we do not know
But is there any theoretical reason to believe that it is not true
@Slereah What is "it" in that sentence?
That some quantum effects can violate the NEC
16:41
So you're asking whether there is something that protects the NEC? I don't think there is
I mean obviously the only experimental way to check would be to look at gravitational effects of those, but is there any sound reason to believe it's not possible with current theories
The only things that are protected from quantum effects are usually related to symmetries - if you can find a symmetry that is quantumly non-anomalous and implies the NEC, then you have your theoretical reason, otherwise, you don't
I guess people usually mention this to cover their ass :p
there are topics where people prefer to write cautiously about lest they be lambasted as a crank
17:00
Schwarze is a p. good book, btw
I think I might recommend it over Peskin
0
Q: What is the "positive question record"?

lucasWhat is the positive question record in figure below?

@Slereah why
why what
@ACuriousMind: you've done it again - this time by 32 seconds :-)
::bows::
17:11
What did he do
Make @JohnRennie curse his slow fingers ;)
Huh?
He's hacked into my webcam so he can tell when I'm about to finish a post, and he posts 30 seconds before :-)
That may or may not have been the purpose of that hack...but it works well enough :P
32 seconds! That's too slim a margin to be just down to chance :-)
Given that I start work at 5 a.m., unwashed, unshaven and wearing yesterdays clothes, anyone hacking into my webcam is likely to end up suing me for their post-traumatic stress disorder.
17:23
@ACuriousMind I asked about the category thing because Hirsch randomly said something was a functor.
But algebraic topology is not a prerequisite
00:00 - 18:0018:00 - 00:00

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