Physics NotePublished
A Model for Baryogenesis at Reheating
Ivano Damião Soares
1994
Publication details
- Authors
- Ivano Damião Soares
- Type
- Physics Note
- Status
- Published
- Publication date
- 1994
- Description
- By using transformation properties of the Hamiltonian of homogenous and isotropic cosmologies, we derive a model describing the transition of the universe from the inflationary phase into the radiation-dominated phase, during the process of reheating. The baryon excess produced in the transition is in a fixed ratio to the radiation content of the radiation-dominated phase. We derive an expression for the baryon asymmetry <math>n_B/n_{\gamma}\,\!</math> as a function of known thermodynamic constants, the gravitational constant, the radius of the present universe and the present temperature of the cosmic background radiation. The only parameter in the formula is the total number of (massless) degrees of freeedom of relativistic particles composing the radiation density. We obtain <math>n_B/n_{\gamma} \sim 5.49 \times 10^{-10}\,\!</math>. Further physical consequences are discussed.
- Year
- 1994
- Number
- CBPF-NF-019/94
- Linked to a thesis
- No
- Linked to a grant
- No