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Re: Pressure

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Posted by Lau, symmetry is beautiful/">Lau, symmetry is beautiful on November 30, 1999 10:56:47 UTC

: : : : But isn't pressure caused by the gravitational attraction of the mass involved? In other words at the center of a neutron star the pressure is very great, but only because of the mass involved. It doesn't seem like pressure is an independent variable but is only an effect of a gravitating mass.

: : : Who said the pressure p always had to be independent of the gravitation due to the mass? It can taken to be an independent variable for some hypothetical scenarios, but needn't be for others. The equation I gave is good for more than just neutron stars. The same would go for the mass density r except that its being approximated by an ideal fluid. : : : : But isn't that double counting? You take the curvature caused by the mass and increase it because of the pressure caused by the mass.

: This isn't always necessary, but it can be done this way. So what? Convergent infinite series solutions are no big deal.

Lau: In the 4x4 metric tensor and the stress energy tensor, I've known that there are 10 independent parameters. But what are they, and how would you go about finding them?

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