Talk:Distance measures (cosmology)

From Wikipedia, the free encyclopedia

	Portal This article is within the scope of WikiProject Physics, which collaborates on articles related to physics.
Stub	This article has been rated as Stub-Class on the assessment scale.
???	This article has not yet received an importance rating within physics.
Help with this template This article has been rated but has no comments. If appropriate, please review the article and leave comments here to identify the strengths and weaknesses of the article and what work it will need.

This article has been automatically assessed as Stub-Class by WikiProject Physics because it uses a stub template. If you agree with the assessment, please remove {{Physics}}'s auto=yes parameter from this talk page. If you disagree with the assessment, please change it by editing the class parameter of the {{Physics}} template, removing {{Physics}}'s auto=yes parameter from this talk page, and removing the stub template from the article.

Contents 1 Page creation rationale 2 Merge from comoving distance 3 merged comparison section to distance measures (cosmology) 4 removed article merge tag to distance measures (cosmology) 5 Unintroduced variables

[edit] Page creation rationale

I made this page because information about various "distance measures in cosmology" seems to be scattered about Wikipedia. Standard textbooks often devote a chapter to the idea of distance measures and then subsections to each of the various kinds, so why not Wikipedia too?

Also, in looking around the articles, the articles on some distanc measures define other distance measures or talk about the relation between them, etc. There were also suggestions on some of the pages that a meta-distance measure page be created.

This page might be a useful introduction to what distance measures are used for, and a good place to describe how they are related to each other. For details we can just refer to the individual pages on each measure. Wesino 09:58, 22 November 2006 (UTC)

[edit] Merge from comoving distance

I noticed that the whole comoving distance article was tagged with a "merge" into Distance measures (cosmology). In my opinion this might be a bit much -- certainly comoving distance is important enough to have its own page? I think that the section regarding comparison with other distance measures on the comoving distance page, though, should go into this page. Any other opinions? Wesino 00:36, 6 December 2006 (UTC)

[edit] merged comparison section to distance measures (cosmology)

Well, no other comments since December so I'll do the move. Wesino | t | 09:41, 9 May 2007 (UTC)

[edit] removed article merge tag to distance measures (cosmology)

The only opinions on here for six months (mine) say no to the merge of the whole article. I just merged the comparison to distance measures (cosmology) so now I'll remove the article merge suggestion tag. Wesino | t | 09:48, 9 May 2007 (UTC)

[edit] Unintroduced variables

Might be because of merging and stuff, but I notice at least two variables that are used without a real introduction or explanation. First, there's chi, which seems to first come up in "If and only if the curvature is zero, then proper motion distance and comoving distance are identical, i.e. d_pm = χ," which seems to mean it represents comoving distance, but it would be nice if that were explicitly defined first. Then, there's d_p, first used in "A practical formula for numerically integrating d_p to a redshift z...." Even less explanation of what that one is. Could someone who knows clear this up? -- J. Randall Owens | (talk) 01:16, 30 September 2007 (UTC)