Late-decaying Q-ball with BBN lifetime

Details Late-decaying Q-ball with BBN lifetime Late-decaying Q-ball with BBN lifetime

2004-08-25

arxiv.org/abs/hep-ph/0408271v2

Nucl.Phys.B709:409-418,2005

Physics

High Energy Physics

High Energy Physics - Phenomenology

version in Nucl.Phys.B (refs added)

Scientific paper

10.1016/j.nuclphysb.2004.12.034

In the Affleck-Dine mechanism of baryogenesis, non-topological solitons called Q-balls can be formed. In this work we study the Q-balls which decay during the Big Bang Nucleosythesis (BBN) era. We show that such late-decaying baryonic Q-balls with lifetime of about 10^3 s can provide a new developing mechanism for the BBN through a rolling baryon to photon ratio \eta, which can naturally explain the discrepancy of BBN prediction with the WMAP data on ^7Li abundance. For the late-decaying leptonic Q-balls with lifetime of about 10^6 s, we find that their decay product, gravitino, can serve as a dark matter candidate without overclosing the universe and, at the same time, can give an explanation of the approximate equality of dark and baryon matter densities.

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