Zero Active Mass in FRW cosmologies

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Discussion Overview

The discussion centers on Fulvio Melia's argument regarding the necessity of "zero active mass" in Friedmann-Robertson-Walker (FRW) cosmologies, specifically the claim that the overall equation of state must satisfy ##\rho + 3p = 0## at all times. The scope includes theoretical implications and critiques of Melia's position.

Discussion Character

  • Debate/contested

Main Points Raised

  • Some participants express interest in Melia's argument for "zero active mass" in FRW cosmologies.
  • Others argue that the equation ##\rho + 3p = 0## is false in the current universe, suggesting flaws in Melia's argument.
  • One participant notes that a recent paper by Melia contains several errors and misunderstandings, emphasizing its lack of peer review.
  • Another participant points out that a different paper also makes the same claim about the equation of state, reiterating that it has not been peer-reviewed.
  • Some participants seem to dismiss the relevance of Melia's work, suggesting that further papers will not change the fundamental issues raised.

Areas of Agreement / Disagreement

Participants generally disagree on the validity of Melia's argument and the equation of state he proposes. There is no consensus on the necessity or correctness of "zero active mass" in FRW cosmologies.

Contextual Notes

Limitations include the lack of peer review for the papers discussed, which may affect the reliability of the claims made. Additionally, the discussion highlights unresolved questions regarding the implications of the equation of state in the context of current cosmological observations.

jcap
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What do people think of Fulvio Melia's argument for the necessity of "zero active mass" in FRW cosmologies? (i.e. the overall equation of state must be ##\rho+3p=0## at all times)

Here is a link to an interesting lecture video:



Here is a recent paper:

https://arxiv.org/abs/1807.07587
 
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jcap said:
What do people think of Fulvio Melia's argument for the necessity of "zero active mass" in FRW cosmologies? (i.e. the overall equation of state must be ##\rho+3p=0## at all times)

Since ##\rho + 3p = 0## is obviously false in the universe now, whatever argument he is making is flawed.

jcap said:
Here is a recent paper

The abstract of this paper contains several obvious errors and misunderstandings. I note that the paper has not been peer reviewed or published in a journal.
 
jcap said:
A more relevant paper

Which still makes the same obviously false claim that ##\rho + 3p = 0##. This paper also has not been peer-reviewed or published in a journal.

The answer to your question is not going to change no matter how many papers by this author you find. Thread closed.
 

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