# Tagged Questions

A rank-2 tensor in relativity, which expresses the flux of energy-momentum along timelike and spacelike axes. Also known as the energy-momentum tensor. In the Einstein field equations, it is the source of gravitational fields.

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### Flat space Solution of Einstein Field Equation

Does a trace-free energy-momentum tensor $T_{\mu}^{\mu} = 0$ ensure that the Einstein's field equations have a flat space solution?
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### When is stress-energy tensor defined as variation of action with respect to metric conserved?

In General Relativity Einstein's equation implies that stress-energy tensor on its RHS is conserved (has vanishing divergence), due to the Bianchi identity. Considering variational principles leading ...
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As far as I understand, one requires that in order for the scalar product between two vectors to be invariant under Lorentz transformations $x^{\mu}\rightarrow x^{\mu^{'}}=\Lambda^{\mu^{'}}_{\,\,\... 0answers 45 views ### “Simple” Variation of the gravity action with boundary I'm concerned with the derivation of the quasi-local stress tensor (getting from eqn 2.4 to eqn 2.6 in this paper: http://arxiv.org/abs/hep-th/0508218). As is the case with all the references I have ... 2answers 110 views ### Does metric signature affect the stress energy tensor? If one were to derive the stress-energy tensor for a metric with$(+,-,-,-)$signature would it be different from the stress-energy tensor derived from the same metric but with$(-,+,+,+)$signature? 1answer 46 views ### What is the property which flows as described by the stress energy tensor in GR? I found the following definitions: The stress–energy tensor (sometimes stress–energy–momentum tensor or energy–momentum tensor) is a tensor quantity in physics that describes the density and flux of ... 1answer 218 views ### What is gravitational energy in general relativity? In GR the curvature of spacetime "is gravity". This curvature is expressed via the Riemann tensor (or the Ricci tensor + Ricci scalar). The curvature is connected via the Einstein Field Equations with ... 1answer 54 views ### What experiments and data have validated that the EM field contributes to the gravitational field? I've studied GR but no experiments or data come to my mind. 1answer 71 views ### Einstein tensor as a conserved current? As is well-known, the traditional" conserved quantities (energy, momentum...) are Noether currents whose conservation depends on the existence of various Killing fields in Minkowski space. In ... 0answers 30 views ### Stuck with physics tensile strength problem So this was a question in my exam. I am not asking for the solution rather some help at a step. A glass spherical shell of radius$R$has a point source of monochromatic light of wavelength$\...
I think that general point of view about central charge in books is considering OPE $T(z) T(w)$ for different field theories and finding that general expression for the most singular term is about to ...