The coframe (teleparallel) description of gravity is known as a viable alternative to GR. One of advantages of this model is the existence of a conserved energy-momentum current witch is covariant under all symmetries of the threeparameter Lagrangian. In this paper we study the relation between the covector valued current and the energy-momentum tensor. Algebraic properties of the conserved cur...

We perform a quenched computation of the glue momentum fraction in the pion. Different dis-cretizations of the gluonic energy-momentum tensor are studied on the lattice for that purpose. We discuss some implications based on the momentum sum rule. Finally we point out promising applications of the techniques developed here.

The " positive square " of any tensor is presented in a universal and unified manner , valid in Lorentzian manifolds of arbitrary dimension, and independently of any (anti)-symmetry properties of the tensor. For rank-m tensors, the positive square has rank 2m. Positive here means future, that is to say, satisfying the dominant property. The standard energy-momentum and super-energy tensors are ...

We investigate the fermionic condensate and the vacuum expectation values of the energymomentum tensor for a massive spinor field in de Sitter spacetime with spatial topology R × (S). Both cases of periodicity and antiperiodicity conditions along the compactified dimensions are considered. By using the Abel-Plana formula, the topological parts are explicitly extracted from the vacuum expectatio...

We consider the theory of gravitational quasi-normal modes for general linear perturbations of AdS4 black holes. Special emphasis is placed on the effective Schrödinger problems for axial and polar perturbations that realize supersymmetric partner potential barriers on the half-line. Using the holographic renormalization method, we compute the energy-momentum tensor for perturbations satisfying...

The variational methods implemented on a quadratic Yang-Mills type Lagrangian yield two sets of equations interpreted as the field equations and the energy-momentum tensor for the gravitational field. A covariant condition is imposed on the energymomentum tensor to represent the radiation field. A generalized pp-wave metric is found to simultaneously satisfy both the field equations and the rad...

We review different computation methods for the renormalised energy momentum tensor of a quantised scalar field in an Einstein Static Universe. For the extensively studied conformally coupled case we check their equivalence; for different couplings we discuss violation of different energy conditions. In particular, there is a family of masses and couplings which violate the weak and strong ener...

The quasilocal energy of gravitational and matter fields in a spatially bounded region is obtained by employing a Hamilton–Jacobi analysis of the action functional. First, a surface stress–energy–momentum tensor is defined by the functional derivative of the action with respect to the three–metric on B, the history of the system’s boundary. Energy density, momentum density, and spatial stress a...

Assuming that the vacuum expectation of the quantum vacuum energy-momentum is zero, I show that fluctuations give rise to a smooth curvature of spacetime. That curvature is currently attributed to a uniform energy-momentum tensor, known as “dark energy”.Our calculation leads to an estimate which roughly agrees with observations. An outstanding open problem in cosmology concerns the nature of “d...

in classical mechanics, considering hook’s law stress is a linear function of strain. while in strain gradient theory stress is a function of strain and strain differentials. in this paper, novel formulation relating stress and strain and also new boundary conditions are derived based on minimum potential energy principle. in strain gradient theory a length coefficient parameter is defined. thi...