Tagged Questions
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votes
0answers
80 views
What are the implications if Supersting theory is discredited? [duplicate]
Please forgive my ignorance, I am not a student of physics in any capacity, therefor my understanding of string theory is extremely limited to say the least. Based on the recent lack of evidence in ...
2
votes
1answer
216 views
What happens to string theory if spacetime is doomed?
What is expected to happen with string theory, if physics is reformulated according the lines hinted at by the twistor-uprising business discussed in this question and its answers for example and ...
7
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0answers
357 views
About defining “baryons” and “mesons”
I want to understand the proof of the claims (of the construction as well as of its uniqueness) of gauge singlet states given around equation 2.13 (page 10) of this paper.
Also does the listing of ...
2
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2answers
159 views
Identification of extended quantum objects?
In some physics theories like string theory we have notion of spatially extended quantum objects - strings, membranes etc. Assuming that such objects exist, how would they appear in experiments ? More ...
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0answers
36 views
why is the modelisation of elementary particle as a two dimensional object in contradiction with General Relativity?
This is asserted by Trinh Xuan Thuan in his book "Chaos & Harmony" chapter String theory.
2
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1answer
113 views
How exactly are the different motions of only one kind of fundamental string assumed to give rise to the spectrum of elementary particles we observe?
In string theory, it is assumed that all particles can be described as quanta corresponding to the excitations of only one kind of fundamental string.
How can in principle the different motion ...
3
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0answers
311 views
Isn't a single Quantum one single string? [duplicate]
In physics, a quantum (plural: quanta) is the minimum amount of any physical entity involved in an interaction.
In Quantum Mechanics There is no difference between one Quantum to another one.
...
7
votes
1answer
111 views
Is the LEP B meson asymmetry evidence for higher dimensions and/or string theory?
According to this blog, new standard model calculations have changed the 3 sigma B meson forward and backward production asymmetry observed at LEP into two anomolies:
A 2.5 sigma B meson production ...
1
vote
1answer
98 views
Hypothetical very massive particles
I'm looking for a table or compilation of hypothetical very massive ($m\gtrsim 1$ TeV) particles and their expected masses (or bounds on them or relation with other scales). All I know is (please, ...
3
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0answers
118 views
Dual Resonance Model: Fermions
I am going through Ramond's 1971 paper Dual Theory for Free Fermions Phys Rev D3 10, 2415 where he first attempts to introduce fermions into the conventional dual resonance model.
I get the 'gist' of ...
1
vote
2answers
92 views
What is unification, unified interactions, or dualities between interactions?
Scientists succeeded in unifying EM with the weak force, then with the strong force to achieve the standard model. They then studied supersymmetry and GUTs that showed improved gauge coupling ...
3
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2answers
555 views
Does string theory and preons exclude each other?
Does string theory contradict the theory of preons, especially the Harari-Shupe one?
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2answers
2k views
Higgs boson and string theory
Assuming Higgs is found at 125 GeV.Is there any direct or indirect consequence on string theory ? Will it be a blow to string theory or models employing string theory ?
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13
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1answer
100 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 ...
6
votes
1answer
410 views
What's with Mandelstam's argument that only linear regge trajectories are stable?
While thinking about how to answer a "describe string theory" question, I remembered an old argument of Stanley Mandelstam's that linear Regge trajectories implies stability. I never fully understood ...
3
votes
1answer
659 views
Are There Strings that aren't Chew-ish?
String theory is made from Chew-ish strings, strings which follow Geoffrey Chew's S-matrix principle. These strings have the property that all their scattering is via string exchange, so that the ...
10
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4answers
1k views
What are the details around the origin of the string theory?
It is well-known even among the lay public (thanks to popular books) that string theory first arose in the field of strong interactions where certain scattering amplitudes had properties that could be ...
13
votes
1answer
435 views
How come random matrices can predict energy spectra of heavy atoms?
Some of the applications of random matrices is to find the spectra of heavy atoms in nuclear physics which are usually difficult to find otherwise.
How can starting from randomness of some kind, ...
2
votes
1answer
192 views
Does kaon decay etc prove “CP violation” or just “CP or CPT violation”
Shlomo Sternberg (math professor at Harvard) wrote a book called "Group theory and physics". On p156 (link) there's a strange offhand comment:
"Experiments done in 1964 by Fitch and Cronin seem to ...
5
votes
2answers
430 views
Is there a maximum number of types of elementary particles?
Doing a Google search i found a paper called The maximum number of elementary particles in a super symmetric extension of the standard model.
It claims in the abstract that the upper bound is 84 (i ...
0
votes
1answer
180 views
Is the quantum state or information of a particle is all that differentiates it from another particle?
So I have learned in my QM classes that you can't tell one electron from another electron. They are indistinguishable. I also learned that the wavefunction of a particle includes the spacial part and ...
7
votes
8answers
1k views
What future technologies does particle physics and string theory promise? [closed]
What practical application can we expect from particle physics a century or two from now? What use can we make of quark-gluon plasmas or strange quarks? How can we harness W- and Z-bosons or the Higgs ...
6
votes
3answers
258 views
References on the non-compositeness of the known elementary particles
What paper(s) or theory(s) describe or prove that the elementary particles that we have determined today cannot be made up of smaller more fundamental particles?
1
vote
1answer
235 views
With estimates of mass constraints on magnetic monopoles, how likely is one to be found by the LHC(MoEDAL)?
Fermilab seems to have ruled out monopoles with mass less than 850 GeV, but I have seen some estimates of the mass thought to be in the order of up to $10^{18}$ GeV, which, of course, would make them ...
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7answers
2k views
Applications of Algebraic Topology to physics
I have always wondered about applications of Algebraic Topology to Physics, seeing as am I studying algebraic topology and physics is cool and pretty. My initial thoughts would be that since most ...
10
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3answers
1k views
Mathematics of AdS/CFT
To date, what is the most mathematically precise formulation of the AdS/CFT correspondence, and what are the most robust tests of the conjecture?
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4answers
1k views
What is your simplest explanation of the string theory?
How would you explain string theory to non physicists such as myself? I'm specially interested on how plausible is it and what is needed to successfully prove it?
