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Results tagged with string-theory
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user 101126
A class of theories that attempt to explain all existing particles (including force carriers) as vibrational modes of extended objects, such as the 1-dimensional fundamental string. PLEASE DO NOT USE THIS TAG for non-relativistic material strings, such as, e.g., a guitar string.
3
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answer
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Branes in Closed Bosonic String Theory
I've seen in these lectures by Freddy Cachazo that type II-A/B superstring theory has to contain D-branes and open strings non-perturbatively, even though it appears to only contain closed strings in …
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2
votes
1
answer
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Are magnetic charges compulsory in string theory?
In this penultimate lecture of a series given by Freddy Cachazo, the differential forms corresponding to the massless excitations in the Ramond–Ramond sector signal the existence of p-branes sourcing …
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3
votes
1
answer
168
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Argument that the massless bosonic string describes gravitation
I'm attempting to learn about string theory through a series of lectures by Freddy Cachazo. Starting 43 minutes into part 6, he begins to explain why we can associate the traceless, massless, closed s …
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2
votes
0
answers
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Kaluza-Klein compactifications with ${\cal N}=1$ supersymmetry
I'm trying to understand some of the important properties of KK-compactifications of 10-dim heterotic string supergravity on 6-dim Calabi-Yau ($CY_3$) manifolds to a 4-dim theory with ${\cal N}=1$ sup …
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5
votes
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answer
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Questions about "A Quadrillion Standard Models from F-theory"
This afternoon, I tried to read through this paper claiming to "present $\mathcal{O}(10^{15})$ string compactifications with the exact chiral spectrum of the Standard Model of particle physics".
As so …
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