How many baryons are there in the universe?

[franoisbelfor]

Many articles and papers say that 4% of all energy in the universe is baryonic. How many baryons does that make? I do not seem to find any wikipedia article or paper that gives an absolute number. Can anybody help?

Thank you!

François

 

[George Jones]

Then number of baryons in the observable universe is usually estimated to be about 10⁸⁰. See, for example, the solution to problem 6.8,

http://www.physics.ucsb.edu/~tt/PHYS133/hws5.pdf ,

from Barbara Ryden's excellent book Introduction to Cosmology.

 

[Nabeshin]

Coors Cosmology, I like it.

 

[Chronos]

Good answer, Nabeshin, whatever that meant. Fran asked for a number, George gave the best current estimate. Do you have a rebuttal or are you just sniping?

 

[George Jones]

Good answer, Nabeshin, whatever that meant. Fran asked for a number, George gave the best current estimate. Do you have a rebuttal or are you just sniping?

The document to which I linked calculates the number, and after the calculation writes:

"*COORS COSMOLOGY*
The number of baryons in the observable universe is roughly equal to the number of
baryons in a bottle of beer, cubed."