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## 2.3.5 Testing the Conjecture 

The most well known result of using this complicated machinery is the famous viscosity to entropy bound [332, 335] 

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As noted earlier, qualitative estimates of the viscosity at$_{Rhic}$ [121] appear to require such small values of η/s . This encourages continued investigation of applications of the AdS/CFT conjecture, but the big question is: how much can we trust the AdS/CFT results? The duality of N = 4 SYM and Type IIB string theory on a pure AdS$_{5}$ × S 5 background has strong motivation and passed 

