- #1

Buzz Bloom

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The following quote is from the Wikipedia article

where

I would much appreciate seeing a reference citation or an explanation from someone about how the value 0.74 is calculated for the nucleosynthesis era.

By the way, when I searched the internet for this information, all I could find were articles that quoted the same material from Wikipedia.

https://en.wikipedia.org/wiki/Big_Bang_nucleosynthesis#Characteristics .

The temperature/time relation in this era can be given by the equation:

The temperature/time relation in this era can be given by the equation:

t is time in seconds,

T is temperature in MeV, and

g* is the effective number of particle species.

(g* includes contributions of 2 from photons, 7/2 from electron-positron pairs and 7/4 from each neutrino flavor. In the standard model g* is 10.75).

T is temperature in MeV, and

g* is the effective number of particle species.

(g* includes contributions of 2 from photons, 7/2 from electron-positron pairs and 7/4 from each neutrino flavor. In the standard model g* is 10.75).

By the way, when I searched the internet for this information, all I could find were articles that quoted the same material from Wikipedia.

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