Type II Small Stringy Black Holes, Probe Branes and Higher Derivative Interactions

Understand

The near horizon geometry of a fundamental string wrapped around an S1 reduced to four dimensions is expected to be AdS2 x S2.

• A probe string analysis suggests a no-force condition indicating supersymmetry, which coincides with the condition that the AdS2 is embedded in AdS3.
• We therefore consider the bulk string theory in terms of a WZW model on AdS3 following recent proposals by Dabholkar et.
• al and Giveon et.