
#1
Oct1209, 08:08 PM

PF Gold
P: 133

My teacher told me that in my essay I need to briefly describe string theory (because I'm talking about how the LHC is a good test for string theory) and by briefly she told me 1 sentence.
If anyone could tell me how THEY would describe string theory in 1 sentence that would be much appreciated! Gavin 



#2
Oct1309, 12:29 AM

Sci Advisor
P: 5,307

I'll try it:
String theory tries to construct a supersymmetric framework in 10 (11) dimensions from which all known elementary particles and interactions including gravity emerge (uniquely) from the modes of an onedimensional, vibrating string. The "trial" is bold bevcause up to now they did not succeed; "uniquely" is in brackets because there are indications that the theory is by no means unique; some string theorists try to find a selection principe, some others simpy believe in the anthropic principle; "11" is in brackets because there are indications that the theory has a dual description in 11 dimensions; I leave out certain subtleties like higherdimensional objects, pbranes etc. Let's discuss it ... 



#3
Oct1309, 12:59 AM

PF Gold
P: 133

Heh, thanks Tom, the only problem with yours is it's too complicated for my class. I have been coming up with things along those lines but I realize I have to "dumb it down" a lot, considering it's english class, not physics class haha.
Thanks though, I might use the part about particles and interactions emerging from different dimensions. 



#4
Oct1309, 02:10 AM

Sci Advisor
P: 4,495

String theory in one sentence please!
Let me try:
According to string theory, elementary particles are not really pointlike, but have a shape of a short string, too short to be visible with present technology. Is that dumb enough? 



#5
Oct1309, 03:06 AM

P: 1,160

String theory is another failed attempt to describe everything without any experimental background.




#7
Oct1309, 04:44 AM

P: 100





#8
Oct1309, 06:50 AM

P: 3,176

Besides, every physical theory is a failed attmept to describe phenomena eventually. 



#9
Oct1309, 08:17 AM

P: 1,160

Let us look at the Newton's second law: ma = F. It is a generalization of many experimental data. Look at the Hook's law: F = kx. It is also an experimental fact for elastic bodies. Remember PV=NT, I=U/R, q=λ∇T (for heat flux), etc. Each physical law has its domain of application where all involved letters are physically meaningfull. Another matter these laws are not universal, they all have limited ranges of validity. The usual geometry is a generalization of experimental facts too. It is a big mistake to think that one can start from ungrounded postulates or axioms and obtain some reality. What is obtained in this way is mathematical sequences of mathematical postulates, nothing else. String theory is just a mathematical exercise with big but unfounded claims. No wonder it resulted in nothing physical. 



#10
Oct1309, 08:26 AM

P: 2,456

But TOE, by definition, should not be limited to any domain 2 It is an exact program of MUH, called "physics from scratch" 3 mathematics IS physics! 



#11
Oct1309, 08:39 AM

P: 1,160





#12
Oct1309, 09:04 AM

P: 2,456

I don't want to touch (again) the MUH, but at least agree that when we talk about TOE we must be ready that it will be a very final step in a sequence of the infinite reduction.




#13
Oct1309, 09:16 AM

P: 1,160





#15
Oct1309, 09:19 AM

P: 1,160

And I do not like to fool myself.




#16
Oct1409, 01:49 AM

Sci Advisor
PF Gold
P: 9,183

String is a purely mathematical attempt to model reality. It is not provably wrong [and may never be], but, empirically unsatisfying thus far. It explains some observations, mostly at the quantum level, but otherwise has no compelling observational support.




#17
Oct1409, 02:04 AM

P: 407





#18
Oct1409, 03:59 AM

P: 320




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