All Questions
Tagged with duality string-theory
73
questions
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2
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109
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Why $N\to \infty$ limit implies $g_s \to 0$ in holographic QCD?
One basic difficulty in QCD is that it does not contain a small dimensionless quantity that would allow for perturbative calculation of low-energy observables.
A remarkable feature of holographic ...
- 227
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3
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155
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Are dualities symmetries? If so what are their conserved charges?
The dualities described the theories under certain transformations to be equivalent, i.e. $T$-duality described the equivalence between theories with $R$ and $\frac{1}{R}$. However, this looked very ...
- 3,256
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83
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How did the T-duality change the dimension of the $D$-brane?
Quote Clifford Johnson $D$-brane page 125
Observe that, since T-duality interchanges Neumann and Dirichlet boundary conditions, a further T-duality in a direction tangent to a $Dp$-brane reduces it ...
- 3,256
4
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162
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Why are we able to compare the open and closed string perspective in AdS/CFT?
I am reading the book Gauge/Gravity Duality Foundations and Applications by M. Ammon and J. Erdmenger. In that book they state the relationship between parameters on both sides of the duality as
$$
g_{...
- 87
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0
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104
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Are dualities necessarily quantum mechanical?
What happens to dualities in a certain limit where quantum mechanics is turned off?
Like sending $\hbar/S$ $\rightarrow0$ where $S$ is the action of each side of the duality.
Does the duality have a ...
- 1,268
2
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224
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Implications of M-Theory on the correctness of String Theory
So we know that there are 5 types of string theories (Type 1, Type IIA, Type IIB, $SO(32)$ heterotic, and $E_8 \times E_8$ heterotic). It was shown that these 5 types are just limits of something ...
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7
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470
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Isn't AdS/CFT an end to String theory as a fundamental theory?
I start with the Large $N$ QCD paper by 't Hooft.
When 't Hooft published his paper on Large $N$ QCD it was clear why the string theory of hadrons due to Gabriele Veneziano could make sense. But at ...
- 1,268
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86
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Brane fluctuations via $S$-duality
Caveat lector: I'm a mathematician trying to learn physics so I apologize if my questions are very vague or trivial.
I'm currently studying Maldacena's Black Holes in String Theory (https://arxiv.org/...
- 145
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Identical OPE behaviour of CFT of T-dual $X’^{\mu}$ of $X^{\mu}$
In chapter $8$ (String theory vol $\mathrm{I}$) sec $8.3$ Polchinski states that
The field $X’^{25}$ has same OPE and energy momentum tensor as $X^{25}$ the minus signs always entering in pair
$$X^{...
- 3,043
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136
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Action in AdS/CFT correspondence
I am a beginner trying to study AdS/CFT correspondence.
Could someone please explain, can we connect action in the gravity side to the field theory side by this correspondence? Can we write the ...
- 186
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167
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Dualities in Physics and Fourier Transforms
In many articles, authors compare physical dualities to Fourier transforms.
For example:
Joseph Polchinski, in his article "String Duality" (hep-th/9607050v2), writes: "Weak/strong ...
- 63
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74
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At what coordinate is the D-brane located in the T dual world?
I have a simple question on the geometrical intuition of D branes. I am currently reading the TASI notes by Polchinski.
Say one has a bosonic open string with all Neumann boundary conditions and ...
- 11.6k
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100
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What is $\mu_5$ in string theory?
I have come across the quantity $\mu_5$ in string theory quite a lot but I have not found it explicitly defined anywhere.
The bosonic worldvolume action reads [1]
\begin{equation}
S = \frac{\mu_5}{g_s}...
- 119
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169
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$T$-duality in effective gauge theories of a $D(p+1)$-brane
I am considering a $D(p+1)$-brane in a space $\mathbb R^{1,p}\times S_R^1$ where $S_R^1$ is the circle of radius $R$. I am assuming low energies $ER\ll1$, so that only the massless spectrum of the ...
3
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Transformation of the string coefficient under T-duality
I am trying to study an effective string theory valid in the low energy limit $ER<<1$. The effective action corresponds to a $D(p+1)$-brane in $R^{1,p}\times S^1$ and it is given by
$$S_{D(p+1)} ...