Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-11-24
Phys.Rev.D76:121302,2007
Astronomy and Astrophysics
Astrophysics
6 pages, 2 figures, to be published in Physical Review D
Scientific paper
10.1103/PhysRevD.76.121302
The $^6$Li abundance observed in metal poor halo stars exhibits a plateau similar to that for $^7$Li suggesting a primordial origin. However, the observed abundance of $^6$Li is a factor of $10^3$ larger and that of $^7$Li is a factor of 3 lower than the abundances predicted in the standard big bang when the baryon-to-photon ratio is fixed by WMAP. Here we show that both of these abundance anomalies can be explained by the existence of a long-lived massive, negatively-charged leptonic particle during nucleosynthesis. Such particles would capture onto the synthesized nuclei thereby reducing the reaction Coulomb barriers and opening new transfer reaction possibilities, and catalyzing a second round of big bang nucleosynthesis. This novel solution to both of the Li problems can be achieved with or without the additional effects of stellar destruction.
Boyd Richard N.
Kajino Toshitaka
Kusakabe Motohiko
Mathews Grant J.
Yoshida Takashi
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