Accurate Measurement of Cosmological Constant Value

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Discussion Overview

The discussion focuses on the accurate measurement of the cosmological constant, exploring various values and references that participants use in their research. The scope includes theoretical aspects and the application of cosmological parameters in research contexts.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant requests recommendations for papers that provide accurate values of the cosmological constant.
  • Another participant cites the Planck 2015 value of the density parameter (\Omega_\Lambda) as approximately 0.69, relating it to the cosmological constant through a specific equation.
  • A third participant provides a link to the Planck 2015 publications, indicating where to find values for \Omega_{\Lambda} and H_0.
  • A later reply presents a predicted value of the density of the cosmological constant in Planck units as 1.388 × 10−123 and a measured value of (1.48 ± 0.16) × 10−123, along with a reference link.

Areas of Agreement / Disagreement

Participants present various values and references for the cosmological constant, but there is no consensus on a single value or source, indicating multiple competing views remain.

Contextual Notes

Participants reference different publications and values, but the discussion does not resolve which value should be preferred or accepted as definitive.

Einstein's Cat
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Could anyone please recommend a paper that accurately gives the value of the cosmological constant? Or else may you reply with values of the cosmological constant that you would you use in your research? Any help would be very much appreciated.
 
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The most common value given is the density parameter ([itex]\Omega_\Lambda[/itex]) equivalent of the cosmological constant, with a latest value (Planck 2015) of about 0.69. This is related to the value of the cosmological constant by
$$\Lambda = \frac{3H_0^2}{c^2} \Omega_\Lambda$$
In this equation you have to convert H0 to per second (s-1), if you want to use SI units for c.
 
Einstein's Cat said:
Could anyone please recommend a paper that accurately gives the value of the cosmological constant?
The predicted value of the density of the cosmological constant in Planck units is = 1.388 × 10−123
the measured value quoted in the reference below is (1.48 ± 0.16) × 10−123 .
REFERENCE:
http://arxiv.org/pdf/astro-ph/0703774v1.pdf
 

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