ar X iv : 0 70 6 . 21 91 v 1 [ he p - ph ] 1 4 Ju n 20 07 Phases of Cold , Dense Quarks at Large N c

ar X iv : 0 70 6 . 21 91 v 2 [ he p - ph ] 1 6 Ju l 2 00 7 Phases of Dense Quarks at Large N c

In the limit of a large number of colors, Nc, we suggest that gauge theories can exhibit several distinct phases at nonzero temperature and quark density. Two are familiar: a cold, dilute phase of confined hadrons, where the pressure is ∼ 1, and a hot phase of deconfined quarks and gluons, with pressure ∼ N c . When the quark chemical potential μ ∼ 1, the deconfining transition temperature, Td,...

ar X iv : 0 70 8 . 34 27 v 1 [ he p - la t ] 2 5 A ug 2 00 7 Meson masses at large N c

We analyze the meson spectrum in SU(N c) lattice gauge theory. We use Wilson quarks to measure the pseudoscalar and vector masses in SU(2), SU(3), SU(4) and SU(6), and extrapolate to the large–N c limit. We find that finite–N c corrections are small at all values of the quark mass.

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 70 6 . 21 51 v 1 [ as tr o - ph ] 1 4 Ju n 20 07 BRX - TH 589 UFIFT - QG - 07 - 03

We explore nonlocally modified models of gravity, inspired by quantum loop corrections, as a mechanism for explaining current cosmic acceleration. These theories enjoy two major advantages: they allow a delayed response to cosmic events, here the transition from radiation to matter dominance, and they avoid the usual fine tuning; instead, emulating Dirac’s dictum, the required large numbers com...

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