The energy-momentum tensor for a massless conformally coupled scalar field in the region between two curved boundaries in k = −1 static Robertson–Walker spacetime is investigated. We assume that the scalar field satisfies the Dirichlet boundary condition on the boundaries. k = −1 Robertson–Walker space is conformally related to the Rindler space, as a result we can obtain vacuum expectation val...

We compute the shear viscosity of the non-commutative N=4 super Yang-Mills quantum field theory at strong coupling using the dual supergravity background. Special interest derives from the fact that the background presents an intrinsic anisotropy in space through the distinction of commutative and non-commutative directions. Despite this anisotropy the analysis exhibits the ubiquitous result η/...

In this talk, we report results of our recent studies to delineate effects of the tensor force on the density dependence of nuclear symmetry energy within phenomenological models. The tensor force active in the isosinglet neutron-proton interaction channel leads to appreciable depletion/population of nucleons below/above the Fermi surface in the singlenucleon momentum distribution in cold symme...

We generalize (linearized) relativistic hydrodynamics by including all order gradient expansion of the energy momentum tensor, parametrized by four momenta-dependend transport coefficients, one of which is the usual shear viscosity. We then apply the AdS/CFT duality for N = 4 SUSY in order to compute the retarded correlators of the energy-momentum tensor. From these correlators we determine a l...

In this paper we classify static plane symmetric spacetimes according to their matter collineations. These have been studied for both cases when the energy-momentum tensor is non-degenerate and also when it is degenerate. It turns out that the non-degenerate case yields either four, five, six, seven or ten independent matter collineations in which four are isometries and the rest are proper. Th...

We give a new representation as tempered distribution for the energy–momentum tensor of a system of charged point–particles, which is free from divergent self– interactions, manifestly Lorentz–invariant and symmetric, and conserved. We present a covariant action for this system, that gives rise to the known Lorentz–Dirac equations for the particles and entails, via Noether theorem, this energy–...

A new set of on shell duality equations is proposed that leads to a map between strings moving on symmetric spaces with opposite curvatures. The transformation maps “waves” on a riemannian symmetric space M to “waves” on its dual riemannian symmetric space M̃ . This transformation preserves the energy momentum tensor though it is not a canonical transformation. The preservation of the energy mom...

We consider dimensional reduction of the lightlike holography of the covariant entropy bound from D + 1 dimensional geometry of M × S1 to the D dimensional geometry M . With a warping factor, the local Bekenstein bound in D+ 1 dimensions leads to a more refined form of the bound from the D dimensional view point. With this new local Bekenstein bound, it is quite possible to saturate the lightli...

We propose a general frame work for deriving the OPEs within a logarithmic conformal field theory (LCFT). This naturally leads to the emergence of a logarithmic partner of the energy momentum tensor within an LCFT, and implies that the current algebra associated with an LCFT is expanded. We derive this algebra for a generic LCFT and discuss some of its implications. We observe that two constant...

We use an auxiliary field construction to discuss the hard thermal loop effective action associated with massless thermal SU(N) QCD interacting with a weak gravitational field. It is demonstrated that the previous attempt to derive this effective action has only been partially successful and that it is presently only known to first order in the graviton coupling constant. This is still sufficie...