Stress–energy pseudotensor of gravitation field for DE

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SUMMARY

The discussion centers on the Einstein equation for a universe devoid of matter, represented as \( G_{ik} = \chi T_{ik} \), where the cosmological constant \( \Lambda \) is expressed as a stress–energy tensor of Dark Energy (DE). The stress–energy tensor is defined in a diagonal matrix form, indicating uniform energy density across spatial dimensions. Participants explore the introduction of the stress–energy pseudotensor of the gravitational field, specifically the Landau-Lifshitz pseudotensor \( t^{ik} \), and its relationship to the stress–energy tensor. The conversation raises the question of whether different volumes of DE exert gravitational influence.

PREREQUISITES
  • Understanding of Einstein's field equations
  • Familiarity with stress–energy tensors
  • Knowledge of Landau-Lifshitz formalism
  • Concept of cosmological constant in general relativity
NEXT STEPS
  • Study the derivation of the stress–energy tensor for Dark Energy
  • Examine the Landau-Lifshitz pseudotensor in detail
  • Research the implications of different volumes of Dark Energy on gravitational effects
  • Explore applications of Einstein's equations in cosmological models
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The discussion is beneficial for theoretical physicists, cosmologists, and researchers focusing on general relativity and dark energy dynamics.

sergiokapone
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Suppose we have Einstein equation for *Universe free of matter* in form
\begin{equation}
G_{ik} = \chi T_{ik},
\end{equation}
where the cosmological constant $\Lambda$ is transferred to the RHS of equation and written in the form of stress–energy tensor of Dark Energy:

\begin{equation}\label{1}
T_{ik} = \begin{bmatrix}
\rho & 0 & 0 & 0 \\
0 & \rho & 0 & 0 \\
0 & 0 & \rho & 0 \\
0 & 0 & 0 & \rho
\end{bmatrix}
\end{equation}

Also, we can introduce the stress–energy pseudotensor of gravitation field in form of Landau-Lifshitz $t^{ik}$ and figure out:
\begin{equation}\label{2}
\frac{\partial }{\partial x^k} (-g) (T^{ik} + t^{ik}) = 0.
\end{equation}

Is it possible to find an expression for ##t^{ik}## pseudotensor, not counting it by the general formula from Landau-Lifshitz?
 
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I think you are referring formula (101.6) and (101.7) of L-L text https://archive.org/stream/TheClassicalTheoryOfFields/LandauLifshitz-TheClassicalTheoryOfFields#page/n317/mode/2up. How about trying to apply the general formula to your specific case ?
 
Yes, I will try later. But what we can say about DE. Does the two different volumes of DE gravitate?
 

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