Neutron diffusion and nucleosynthesis

  • Thread starter wolram
  • Start date

wolram

Gold Member
4,223
551
http://arxiv.org/abs/astro-ph/0506364

Title: Neutron Diffusion and Nucleosynthesis in an Inhomogeneous Big Bang Model
Authors: Juan F. Lara
Comments: accepted for publication in Physical Review D

This article presents an original code for Big Bang Nucleosynthesis in a baryon inhomogeneous model of the universe. In this code neutron diffusion between high and low baryon density regions is calculated simultaneously with the nuclear reactions and weak decays that compose the nucleosynthesis process. The size of the model determines the time when neutron diffusion becomes significant. This article describes in detail how the time of neutron diffusion relative to the time of nucleosynthesis affects the final abundances of He4, deuterium and Li7. These results will be compared with the most recent observational constraints of He4, deuterium and Li7. This inhomogeneous model has He4 and deuterium constraints in concordance for baryon to photon ratio eta = (4.3 - 12.3) X 10^{-10} Li7 constraints are brought into concordance with the other isotope constraints by including a depletion factor as high as 5.9. These ranges for the baryon to photon ratio and for the depletion factor are larger than the ranges from a Standard Big Bang Nucleosynthesis model.
 

Garth

Science Advisor
Gold Member
3,572
105
wolram said:
http://arxiv.org/abs/astro-ph/0506364

Title: Neutron Diffusion and Nucleosynthesis in an Inhomogeneous Big Bang Model
Authors: Juan F. Lara
Comments: accepted for publication in Physical Review D
...................
These ranges for the baryon to photon ratio and for the depletion factor are larger than the ranges from a Standard Big Bang Nucleosynthesis model.
Does that mean the standard BBN model has to be baryon homogeneous?

Garth
 

hellfire

Science Advisor
1,047
1
I think yes, but I am not sure. The universe is homogeneous after inflation. Why should it be 'baryon inhomogeneous'?
 

Related Threads for: Neutron diffusion and nucleosynthesis

Replies
2
Views
711
  • Posted
Replies
2
Views
2K
Replies
2
Views
2K
  • Posted
Replies
10
Views
5K
Replies
7
Views
2K
Replies
2
Views
615
Replies
1
Views
2K
  • Posted
Replies
4
Views
3K

Physics Forums Values

We Value Quality
• Topics based on mainstream science
• Proper English grammar and spelling
We Value Civility
• Positive and compassionate attitudes
• Patience while debating
We Value Productivity
• Disciplined to remain on-topic
• Recognition of own weaknesses
• Solo and co-op problem solving
Top