Stress–energy pseudotensor of gravitation field for DE

In summary, the conversation discusses the Einstein equation for a universe without matter, where the cosmological constant is transferred to the right-hand side as the stress-energy tensor of Dark Energy. The stress-energy pseudotensor of the gravitation field is also introduced, and the possibility of finding an expression for it without using the general formula from Landau-Lifshitz is discussed. The conversation also mentions applying the general formula to the specific case and questions whether two different volumes of Dark Energy gravitate.
  • #1
sergiokapone
302
17
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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  • #2
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 ?
 
  • #3
Yes, I will try later. But what we can say about DE. Does the two different volumes of DE gravitate?
 

1. What is the stress-energy pseudotensor of gravitation field for DE?

The stress-energy pseudotensor of gravitation field for DE is a mathematical construct used in general relativity to describe the distribution of energy and momentum in spacetime caused by dark energy. It takes into account the effects of both matter and dark energy on the curvature of spacetime.

2. How is the stress-energy pseudotensor of gravitation field for DE derived?

The stress-energy pseudotensor of gravitation field for DE is derived from the Einstein field equations, which describe the relationship between the curvature of spacetime and the distribution of matter and energy within it. It is a complex mathematical calculation that takes into account various factors such as the energy-momentum tensor and the gravitational constant.

3. What is the significance of the stress-energy pseudotensor of gravitation field for DE?

The stress-energy pseudotensor of gravitation field for DE is significant because it helps us understand the effects of dark energy on the universe. By incorporating dark energy into the equations of general relativity, we can better explain the acceleration of the expansion of the universe and other phenomena that cannot be explained by the presence of matter alone.

4. Can the stress-energy pseudotensor of gravitation field for DE be measured or observed?

No, the stress-energy pseudotensor of gravitation field for DE cannot be measured or observed directly. It is a theoretical concept used to describe the effects of dark energy on spacetime. However, its predictions can be tested through observations and experiments, such as the study of the expansion rate of the universe and the distribution of matter and dark energy within it.

5. Are there any alternative theories to the stress-energy pseudotensor of gravitation field for DE?

Yes, there are alternative theories to the stress-energy pseudotensor of gravitation field for DE, such as modified gravity theories. These theories propose different explanations for the observed acceleration of the expansion of the universe, without the need for dark energy. However, the stress-energy pseudotensor of gravitation field for DE is currently the most widely accepted explanation within the framework of general relativity.

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