Comments about "Age of the universe" in Wikipedia

This document contains comments about the article Age of the universe in Wikipedia
In the last paragraph I explain my own opinion.




The article starts with the following sentence.
Measurements of the cosmic background radiation give the cooling time of the universe since the Big Bang, and measurements of the expansion rate of the universe can be used to calculate its approximate age by extrapolating backwards in time.
It is very important to discuss the uncertainties involved in these physical arguments.

1. Explanation

If one extrapolates the Lambda-CDM model backward from the earliest well-understood state, it quickly (within a small fraction of a second) reaches a singularity called the "Big Bang singularity".
It is better to write:
It reaches a state of almost infinite density.
(and not use the word singularity)

2 Observational limits

3. Cosmological parameters

Today this is largely carried out in the context of the ?CDM model, where the universe is assumed to contain normal (baryonic) matter, cold dark matter, radiation (including both photons and neutrinos), and a cosmological constant.
The cosmological constant should be argumented from a physical point of view.

4. 4 WMAP

5 Planck

6 Assumption of strong priors

7 History

8. See also

Following is a list with "Comments in Wikipedia" about related subjects

Reflection 1

Reflection 2

Reflection 3


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Created: 17 December 2017

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