Light Element Nucleosynthesis: A False Clue?
Abstract
It is proposed that the dynamically estimated value for the cosmological density parameter, Omega(dy) = 0.15 x 10 exp +/- 0.20, reflects the baryon density at decoupling, resulting in lower initial, primordial values of D and the He-3 than are observed. An early generation of massive stars, forming somewhat after decoupling, collapses to black holes with masses of about 10 exp 6.5 solar masses. If they later accrete gas and emit a quasarlike (X, gamma)-ray spectrum, then (gamma, (He-4)) photodisintegration reactions will increase D and He-3 to the observed range, leaving a high-energy background radiation field similar to that observed. The massive black holes become the dynamically observed dark matter galactic halos. This scenario obviates the need for nonbaryonic dark matter and provides a specific form for the requisite baryonic dark matter; it thus reduces the number of density parameters: Omega(0) - Omega(dy) = Omega(BBN) is approximately equal to 0.15.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- November 1992
- DOI:
- 10.1086/171968
- Bibcode:
- 1992ApJ...400....1G
- Keywords:
-
- Cosmology;
- Gamma Ray Spectra;
- Light Elements;
- Massive Stars;
- Nuclear Fusion;
- X Ray Spectra;
- Black Holes (Astronomy);
- Nuclear Reactions;
- Quasars;
- Universe;
- Astrophysics;
- COSMOLOGY: THEORY;
- COSMOLOGY: EARLY UNIVERSE;
- GAMMA RAYS: THEORY;
- NUCLEAR REACTIONS;
- NUCLEOSYNTHESIS;
- ABUNDANCES;
- X-RAYS: GENERAL