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Stress-energy tensor

  1. Dec 30, 2009 #1
    What is the interpretation of stress energy-tensor in general relativity.
    According to General Relativity by Wald [itex] T^{\mu\nu} u_\mu u_\nu [/itex]
    is energy density (chapter 4.2) where [itex] u_\mu [/itex] is observer 4-veliocity.
    But for isolated particle [itex] T^{\mu\nu} = \gamma m V_\mu V_\nu [/itex]
    (http://en.wikipedia.org/wiki/Stress_energy_tensor#Isolated_particle") in particle reference frame
    we obtain density of energy: [itex]m / \gamma [/itex] and not [itex]m[/itex]
    (because [itex]V_\mu^2=1/\gamma^2[/itex] - it's not 4-veliocity but simpliy veliocity).
    Last edited by a moderator: Apr 24, 2017
  2. jcsd
  3. Dec 30, 2009 #2
    The stress-energy tensor contains information about energy density, momentum density and flow of momentum(force). The Einstein field equations show that it is related to the curvature of spacetime.
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