Talk:Lemaître–Tolman metric: Difference between revisions

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Physics: Relativity Start‑class Low‑importance

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An error in the E<0 case

It seems there is an error in the solution $R(r,t)$ to the evolution equation in the case $E<0$. For the radius, the current text states R = (M/2E) [1-cos (eta)]. The right hand side is negative (E<0 !!) while the radius should be positive; I'm reluctant to correct it myself because errors may have propagated farther than just that and this correction alone may not be comprehensive.

where the E propto M^{2/3} error came from...

For people who saw this page earlier (or edited without checking), the E propto M^{2/3} error that sat on this page was introduced by the original author: Template:Sec link auto in his/her second edit. This editor: Template:Sec link auto clearly made a lot of useful and well-intended edits on this general topic, for just two days, and then disappeared from wikipedia. For three and a half years, nobody noticed the error... Boud (talk) 13:43, 10 March 2011 (UTC)[reply]

Apparently E propto M^{2/3} is not actually an error, it just seems odd because r does not measure radial distance in comoving units. IMHO this should be better explained before being reinserted, so i'll just leave it as it is, at least for the moment. Boud (talk) 10:49, 11 March 2011 (UTC)[reply]

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 {{Physics|class=start|importance=low|relativity=yes}}
+== An error in the E<0 case ==
 It seems there is an error in the solution $R(r,t)$ to the evolution equation in the case $E<0$. For the radius, the current text states R = (M/2E) [1-cos (eta)]. The right hand side is negative (E<0 !!) while the radius should be positive; I'm reluctant to correct it myself because errors may have propagated farther than just that and this correction alone may not be comprehensive.