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
Then number of baryons in the observable universe is usually estimated to be about 10^{80}. 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.
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."