We list the spectrum generating algebras for string theory and M-theory compactified on various backgrounds of the form AdSd+1 × S. We identify the representations of these algebras which make up the classical supergravity spectra and argue for the presence of these spectrum generating algebras in the classical string/M-theory. We also discuss the role of the spectrum generating algebras on the...

We consider sound propagation on M5and M2-branes in the hydrodynamic limit. In particular, we look at the low energy description of a stack of N M-branes at finite temperature. At low energy, the M-branes are well described, via the AdS/CFT correspondence, in terms of classical solutions to the eleven dimensional supergravity equations of motion. From this gravitational description, we calculat...

We calculate the scalar quasinormal modes of warped AdS3 black holes analytically. We find that in general they are not in agreement with the prediction of the usual AdS/CFT correspondence. Nevertheless, for the black hole not deviating far from BTZ black hole, the quasinormal frequencies are still well consistent with AdS/CFT correspondence. ∗Email:bchen01,[email protected]

We suggest a model of the large N limit N = 4 D = 4 SU(N) SYM as a gas of 3-branes in a 10 dimensional space. Field theory analysis suggests that this 10 dimensional space does not carry the usual gravity dynamics but rather a contraction of it. Using a non-local transformation some aspects of the dynamics of this system are mapped to the dynamics of standard gravitons on AdS5 × S. In particula...

Background: Pulmonary lesions called “inflammatory pseudotumors” were known for many years and were regarded as part of a spectrum of lesions called “plasma cell granulomas” (1-5) Various terms were applied: inflammatory pseudotumor, plasma cell granuloma, plasma cell pseudotumor, xanthomatous pseudotumor, pseudosarcomatous myofibroblastic proliferation, and inflammatory myofibrohistiocytic pro...