ar X iv : 0 80 6 . 39 76 v 1 [ he p - th ] 2 4 Ju n 20 08 Black Hole Entropy and Gravity Cutoff

ar X iv : 0 80 6 . 22 70 v 2 [ he p - th ] 2 0 Ju n 20 08 An N = 1 Superfield Action for M 2 branes

We present an octonionic N = 1 superfield action that reproduces in components the action of Bagger and Lambert for M2 branes. By giving an expectation value to one of the scalars we obtain the maximally supersymmetric superfield action for D2 branes.

ar X iv : 0 80 2 . 21 76 v 1 [ he p - th ] 1 5 Fe b 20 08 Area Law in Noncommutative Schwarzschild Black Hole

We show analytically that the semiclassical Bekenstein-Hawking area law for noncommutative Schwarzschild black hole in the regime r h 4θ >> 1 is a standard noncommutative deformation of the usual law, upto the leading order in the noncommutative parameter θ. A graphical analysis shows that for the horizon radius rh & 4.8 √ θ, this area law exactly holds for all orders of θ. Finally, we also giv...

ar X iv : 0 80 6 . 46 34 v 1 [ he p - ex ] 3 0 Ju n 20 08 LPHE 2008 - 05 June 30 , 2008 B 0 – B 0 MIXING

ar X iv : 0 80 6 . 40 68 v 1 [ he p - th ] 2 5 Ju n 20 08 A Non - Supersymmetric Large - N 3 D CFT And Its Gravity Dual

We propose a three dimensional non-supersymmetric theory that is conformal in the large N limit. In a certain well defined bosonic sub-sector of gauge invariant operators, this theory is planar equivalent to the theory recently proposed by Aharony, Bergman, Jafferis and Maldacena as the theory on multiple M2 branes at an orbifold singularity. We discuss the realization of the theory on a brane ...

ar X iv : 0 80 6 . 42 65 v 1 [ he p - th ] 2 6 Ju n 20 08 Relation Between Holonomy Groups in Superstrings , M and F - theories

We consider manifolds with special holonomy groups SU(3), G2 and Spin(7) as suitable for compactification of superstrings, M-theory and F-theory (with only one time) respectively. The relations of these groups with the octonions are discussed, reinforcing their role in the physics of string theory and duality. We also exhibit three triple exact sequences explaining the connections between the m...