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|Paper IPM / P / 8740||
We study near-horizon limits of near-extremal charged black hole solutions to five-dimensional U(1)3 gauged supergravity carrying two charges, extending the recent work of Balasubramanian et.al. We show that there are two near-horizon decoupling limits, one corresponding to the near-BPS black hole and the other to near-extremal but not BPS case. Both of these limits are only defined on the 10d IIB uplift of the 5d black holes, resulting in a decoupled geometry with a six-dimensional part (conformal to) a rotating BTZ X S3. We study various aspects of these decoupling limits both from the gravity side and the dual field theory side. For the latter we argue that there should be two different, but equivalent, dual gauge theory descriptions, one in terms of the 2d CFT's dual to the rotating BTZ and the other as certain large R-charge sectors of d=4, N = 4 U(N) SYM theory. We discuss new BMN-type sectors of the N =4 SYM in the N→∞ limit in which the engineering dimensions scale as N3/2 (for the near-BPS case) and as N2 (for the near-extremal, non-BPS case).
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