
#1
Jul1709, 09:11 AM

P: 42

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 



#2
Jul1709, 09:41 AM

Mentor
P: 6,037

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. 



#4
Jul1809, 03:56 AM

Sci Advisor
PF Gold
P: 9,171

How many baryons are there in the universe?
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?



Register to reply 
Related Discussions  
How many mesons and baryons are there?  High Energy, Nuclear, Particle Physics  12  
Pions  how they interact with Baryons  High Energy, Nuclear, Particle Physics  14  
Baryons and their quark constituents  Introductory Physics Homework  2  
Two new heavy baryons Discovered  High Energy, Nuclear, Particle Physics  17 