A class of theories that attempt to explain all existing particles (including force carriers) as vibrational modes of one-dimensional objects.
3
votes
2answers
529 views
Does string theory and preons exclude each other?
Does string theory contradict the theory of preons, especially the Harari-Shupe one?
2
votes
0answers
50 views
Mass spectrum of Type I string theory
I understand that the massless fields of the Type I string theory are the described by:
[\begin{array}{*{20}{c}}
{{\rm{Sector}}}&{{\rm{Massless fields}}}\\
{{\rm{R - R}}}&{{C_0}}\\
{{\rm{NS - ...
2
votes
1answer
260 views
Wilson loops and gauge invariant operators (Part 1)
I guess the Hilbert space of the theory is precisely the space of all gauge invariant operators (mod equations of motion..as pointed out in the answers)
Is it possible that in a gauge theory the ...
2
votes
0answers
51 views
Spectrum of Free Strings [duplicate]
Possible Duplicate:
Spectrum of Free Strings
As far as I understand, both in bosonic and superstring theory one considers initially a free string propagating through D-dimensional ...
1
vote
0answers
78 views
Some questions about flavour and R-symmetry in $2+1$ ${\cal N}=3$ theory
I have heard this fact that for ${\cal N}=3$ theories in $2+1$ with $N_f$ ${\cal N}=3$ matter fields the flavour symmetry group is $USp(N_f)$, $U(N_f)$ or $SO(2N_f)$ depending on whether the gauge ...
13
votes
1answer
95 views
realization of: CFT generating fuction = AdS partition function
An important aspect of the AdS/CFT correspondence is the recipe to compute correlation functions of a boundary operator $\mathcal{O} $ in terms of the supergravity fields in the interior of the ...
8
votes
1answer
93 views
AdS/CFT at D = 3
AdS/CFT at D = 3 (on the AdS side) seems to have some special issues which I bundled into a single question
The CFT is 2D hence it has an infinite-dimensional group of symmetries (locally). The ...
8
votes
2answers
319 views
Heterotic string as worldvolume theory of two coincident 9-branes in 27 dimensions?
The heterotic string is a combination of right-moving excitations from a D=10 superstring and left-moving excitations from a D=26 bosonic string, with the left-movers behaving as if the extra 16 ...
6
votes
1answer
248 views
Mathematical concept of supersymmetry
I wish to study supersymmetry in field theory(sometime in december). However, I am quite not sure what is needed for its study. In supersymmetry, I just want to get the mathematical idea, such as its ...
6
votes
2answers
308 views
Lagrangians combining terms with 1 and 2 derivatives
How are field theory Langrangians treated when some terms have 2 derivatives but others have only 1? Because the number of derivatives in a Lagrangian term is more easily even than odd, the ...
5
votes
1answer
3k views
How would the discovery of Higgs Boson affect superstring theories?
As we probably all know, a new particle similar to Higgs Boson has been discovered.
If this turns out to be true, standard model will get a boost (as the discovered mass almost equals to the ...
5
votes
1answer
292 views
Mathematically rather than physically speaking, is there something “special” about 10 (or 11) dimensions?
As I understand it, string theory (incorporating bosons and fermions) "works" in $9+1=10$ spacetime dimensions. In the context of dual resonance theory, I've read descriptions of why that is ...
4
votes
5answers
584 views
Regarding string theory: how to refute the argument “if it cannot be tested experimentally then it is not science”? [duplicate]
Possible Duplicate:
What differs string theory from philosophy or religion?
I find a lot of people disbelieve in string theory, saying that since it cannot be tested experimentally then it ...
3
votes
0answers
207 views
Mathematics and Physics prerequisites for mirror symmetry [closed]
I am a physics undergrad interested in Mathematical Physics. I am more interested in the mathematical side of things, and interested to solve problems in mathematics using Physics. My current ...
3
votes
3answers
189 views
Why must the excitation of closed strings in String Theory be spin-2?
In String Theory it is predicted that as a result of the closed strings we have spin-2 gravitons.
1) How do we know there must be an excitation of spin-2 particles?
2) Why does a spin-2 particle ...
3
votes
1answer
218 views
Can we have non continuous models of reality? Why don't we have them?
This question is about Godel's theorem, continuity of reality and the Luvenheim-Skolem theorem.
I know that all leading physical theories assume reality is continuous. These are my questions:
1) Is ...
3
votes
2answers
569 views
What is energy in string theory?
Facts agreed on by most Physicists -
GR: One can't apply Noether's theorem to argue there is a conserved energy.
QFT: One can apply Noether's theorem to argue there is a conserved energy.
String ...
2
votes
1answer
209 views
Wilson loops and gauge invariant operators (Part 2)
These questions are sort of a continuation of this previous question.
I would like to know of the proof/reference to the fact that in a pure gauge theory Wilson loops are all the possible gauge ...
2
votes
1answer
341 views
What is the mathematical nature of space time quantization in string theory/super string theory?
I don't know much about string theory, apart from it being a theory of everything which brings QM, QED and nuclear forces and gravity under one single roof. I am curious to know from a mathematical ...
1
vote
1answer
189 views
Would someone who is only interested in string theory benefit from working out the problems in Jackson electrodynamics?
This is a soft question. I'm not sure if it is appropriate for this site.
Would someone who is only interested in string theory benefit from working out the problems in Jackson electrodynamics? I ...
1
vote
2answers
319 views
What Observations could undeniably support string theory?
What experiments could provide observable "stringy" effects.
All valid experiments are acceptable (also theoretical experiments).
0
votes
1answer
449 views
Question on dimensions of CFT operators (ref: MAGOO, hep-th/9905111)
Right now I am having this silly difficulty from the following:
BTW, Conformal dimension/scaling dimension is -ve of mass dimension ..right?
In p-63 of Magoo, after 3.15 eq, they said
a.) $\phi$ is ...
0
votes
3answers
3k views
Total number of subatomic particles in the universe. Are they finite ? assuming any of GR or QM or even ST
Total number of subatomic particles in the universe. Are they finite ? assuming any of GR or QM or even ST.
-4
votes
1answer
205 views
What do scientists believe about existence in dimensions? [closed]
I couldn't really think of a suitable question title, I'm not sure if it's completely related or not.
But this is as far as I know (well, I thought it all up last night and it seemed extremely ...
-5
votes
0answers
60 views
Consequences of Third Postulate of Special Relativity [closed]
Consequences of SR arise from two postulates.
know as this abstract states:
"relativistic action is limited to planck's constant", and maybe we've to consider it as the possible third postulate of ...
