/sci/ - Science & Math

[Anonymous No.4060547]

Why can we quantize the e-m field but not the gravitational field?

[Anonymous No.4060558]

the WM field is nice and does not interact with itself, the gravitational field is a jerk and interacts with itself so you get a divergent series when you try to calculate anything.

[Anonymous No.4060612]

Gluonic fields feature self-interactions as well, still we can quantize the theory...

[Anonymous No.4060635]

>>4060612
with the strong force they assume asymptotic freedom sothat at large range the attraction becomes infinite along with a bunch of other things that alow u to quantize it. but we still dont have an actual wave equation for gluon, most of it is empirical equations.

[Anonymous No.4060649]

>>4060635
Er.. what?
QCD can be quantized at arbitrary renormalization scales. At strong coupling we can still use lattice gauge theory to come up with numeric results. Sure, QCD is nowhere near as fully understood, but the quantization itself isn't the big problem.

[Anonymous No.4060664]

>>4060649
>expecting sci to get anything right

you can quantize gravity under certain constraints, but there are a number of reasons a quantum theory of gravity doesn't work.

[Anonymous No.4060685]

anyone know a good QCD textbook?

[Josef crossed out the Atlantic !!nUf2NflSAyw No.4060697]

>>4060558 the EM field is nice and does not interact with itself
Only on tree level.

[Anonymous No.4060709]

>>4060697
I was just wondering where your posts are :D

[Josef crossed out the Atlantic !!nUf2NflSAyw No.4060713]

>>4060709
Ich habe eben Glühwein in den USA gekauft. Und zwar aus Nürnberg. Wundervoll. (Es ist sogar das nürnberger Christkind drauf.)

[Anonymous No.4060722]

>>4060713
Wohl bekomms

[Anonymous No.4060735]

It isn't quantizable, or we are too stupid to see how to do it. The difficulty of actually measuring gravity on quantum scales doesn't help matters.

[Anonymous No.4060742]

gravity does not occupy distinctive quantum states, so no (plenty of experimental evidence to demonstrate such)

[Anonymous No.4060754]

>>4060713
Damn.
I keep forgetting Josef is German.

Gluhwein is nice. Ever since I'm in Canada, though, I've never been able to buy any damn lebkuchen. Oh, how I miss that stuff...

[Josef crossed out the Atlantic !!nUf2NflSAyw No.4060759]

>>4060754
THANK YOU
One day ago, I was almost used to the way of living here, a friend of mine mentions Glühwein.
Now you come up with Lebkuchen. I curse you.

[Anonymous No.4060762]

>>4060759
how's Universität Wien?

i barely know german, but i'm considering grad research there for a year or two.

[Anonymous No.4060763]

>>4060759
Suffer with me, fellow Germanbro. :)

[Josef crossed out the Atlantic !!nUf2NflSAyw No.4060771]

>>4060762
Wien isn't even in Germany. I guess it's alright, and as usual I can't explain how big universities in Germany (+austria) work to Americans. There are no shitty ones. There is no Ivy League, there is no shitleague. On funding, you probably have to ask the professors themselves, because that can vary a lot between chairs.

[Anonymous No.4060787]

>>4060771
i know, i just figured i'd ask since germans are naturally complementary with austrians (apparently) ;)

thanks, though

[Anonymous No.4060796]

Doing what in Wien?
(Quantum Optics is big, te Statistical Physics team is good)

[Anonymous No.4060806]

>>4060771
>>4060754

[Josef crossed out the Atlantic !!nUf2NflSAyw No.4060810]

>>4060806
Der Blitz soll dich beim scheißen treffen! :c

[Anonymous No.4060812]

>>4060810

[Anonymous No.4060821]

But seriously, the short technical argument would be power counting.
related:
Josef, are you somehow familiar with the whole gauge-gravity-duality thing which is getting more and more popular?

[Josef crossed out the Atlantic !!nUf2NflSAyw No.4060832]

>>4060821 Josef, are you somehow familiar with the whole gauge-gravity-duality thing which is getting more and more popular?
Never heard of it.
On a side note, I've got awesome lemonade here that I'm going to miss back in Germany.

[Anonymous No.4060843]

>>4060832
yes you did, it's the broader name for the whole AdS correspondence thingy. Yang Mills here, string theory with metric there. I have never actually looked into thin in more detail but lately I come across it more and more often (and people are calling it gauge-gravity-duality more and more)

[Josef crossed out the Atlantic !!nUf2NflSAyw No.4060851]

>>4060843
AdS?
Adjoint bundle of S? A times differential of S?

[Anonymous No.4060853]

>>4060821
>string theory bullshit

[Anonymous No.4060878]

>>4060853
it's lovely

>>4060851
...
http://en.wikipedia.org/wiki/AdS/CFT_correspondence
btw. what are you listening to all the time

[Anonymous No.4060879]

>>4060832
is that you, josef?

[Anonymous No.4060901]

The fundamental issue is a total lack of experimental apparatus for testing quantum gravity now, and in the foreseeable future. Without experimental capability you can't figure out which theories are correct nor get any hints about other theories that haven't been considered.

[Anonymous No.4060913]

>>4060901
True. Nevertheless the question why we have problems quantizing it is still legal, I mean that's a somewhat technical problem.

[Josef crossed out the Atlantic !!nUf2NflSAyw No.4061020]

>>4060879 is that you, josef?
No, I usually do not have an awesome smiley over my face.

[Anonymous No.4061040]

>>4061020
>yfw kein Leberkuchen

[Anonymous No.4061041]

>Leberkuchen
lol, Leb*

[Anonymous No.4061046]

>>4060796
>>4060821
>>4060843
>>4060878
>>4060913
>>4061041
is that the only kind of bitch you're capable of posting? i can literally go through the entire archive and pick out every single individual post that is yours

please stop before i am haunted by redheads in a nightmare

[Anonymous No.4061076]

>>4061046
why you mad thou?

(0843 isn't a redhead, but I know what you mean. On the other hand, you can do this with any tripfag too)