Contents

# Contents

## Idea

In Yang-Mills theory/QCD with coupling constant $g_{YM}$ and with $N_c$ colours, the ’t Hooft coupling is the expression

$\lambda \;\coloneqq\; g_{YM}^2 N_c \,.$

## Properties

### In the large $N$ limit

The study of Yang-Mills theory in the large N limit but at fixed ’t Hooft coupling controls the AdS/CFT correspondence:

large N limit$N_c \to \infty$ at fixed 't Hooft coupling $\lambda = g_{YM}^2 N_c$

$\lambda \lt 1$$\lambda \gt 1$
small coupling limit of Yang-Mills theorylow-energy supergravity limit of string theory on asymptotically AdS spacetime

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## References

The original article

Review:

Last revised on January 22, 2020 at 10:32:10. See the history of this page for a list of all contributions to it.