FRW Derivation History: Acker's Questions Answered

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    Derivation History
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Discussion Overview

The discussion revolves around the historical context and derivation of the Friedmann–Lemaître–Robertson–Walker (FRW) metric, particularly whether it was developed in response to the concept of an expanding universe and the timeline of its derivation in relation to Hubble's observations.

Discussion Character

  • Historical
  • Debate/contested

Main Points Raised

  • Acker questions whether the FRW metric was specifically derived to address the expansion of the universe and seeks clarification on the motivations behind its derivation.
  • Acker inquires about the timeline of the FRW derivation, asking if it was developed using Newtonian physics before Einstein's general relativity or after.
  • Some participants suggest that Acker should refer to external sources like Wikipedia for information, which Acker responds to by expressing a preference for direct discourse over simply being directed to look up information.
  • Another participant emphasizes the expectation that individuals asking questions should have made some effort to research the topic beforehand.

Areas of Agreement / Disagreement

The discussion reflects a lack of consensus on the historical details of the FRW derivation and its relation to the expansion of the universe, with participants expressing differing views on the appropriateness of referencing external sources for information.

Contextual Notes

Participants have not fully resolved the timeline of the FRW metric's derivation or its intended purpose, and there are varying opinions on the expectations for prior research by those asking questions.

Acker
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Hello All,

I wondered if anyone could fill in some details about the timeframe of FRW derivation.
Was it derived to purposefully address the expansion of a universe? and if so, how did
anyone know about this prior to Hubble's observations?
Or was it derived for some other purpose and then applied after Hubble?
I am keenly interested in this and would love to hear any information in this forum
regarding the reasons for deriving this cosmological equation.

Regards
Acker

edit. And was it derived using Newton before Einstein's gr or between gr and Hubble's observations?
 
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Thank you Phinds, for your thoughts on the matter.

When I am asked something, I tend to refrain from handing someone an encyclopedia
and quipping 'go look it up'.

It is such a relief that we can always turn to wikipedia for definitive discourse.


Best regards
Acker
 
Folks who come here with questions are expected to have made at least some minimal attempt to do their own homework first, and it sounded as though had not done so.

I refer you to:

https://www.physicsforums.com/blog.php?b=3588
 
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