Gravitino dark matter from Q-ball decays
Gravitino dark matter from Q-ball decays
复制标题
Q 球中的引力暗物质衰变
DOI：
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
A. Kusenko
中科院分区：
文献类型：
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作者：
I. Shoemaker;A. Kusenko
Affleck-Dine baryogenesis, accompanied by the formation and subsequent decay of $Q$-balls, can generate both the baryon asymmetry of the Universe and dark matter in the form of gravitinos. The gravitinos from $Q$-ball decay dominate over the thermally produced population if the reheat temperature ${T}_{R}ensuremath{lesssim}{10}^{7} ext{ } ext{ }mathrm{GeV}$. We show that a gravitino with mass $ensuremath{sim}1 ext{ } ext{ }mathrm{GeV}$ is consistent with all observational bounds and can explain the baryon-to-dark-matter ratio in the gauge-mediated models of supersymmetry breaking for a wide range of cosmological and $Q$-ball parameters. Moreover, decaying $Q$-balls can be the dominant production mechanism for ${m}_{3/2}l1 ext{ } ext{ }mathrm{GeV}$ gravitinos if the $Q$-balls are formed from a $(Bensuremath{-}L)=0$ condensate, which produces no net baryon asymmetry. Gravitinos with masses in the range $50 ext{ } ext{ }mathrm{eV}ensuremath{lesssim}{m}_{3/2}ensuremath{lesssim}100 ext{ } ext{ }mathrm{keV}$ produced in this way can act as warm dark matter and can have observable imprint on the small-scale structure.
Affleck-Dine baryogenesis, accompanied by the formation and subsequent decay of $Q$-balls, can generate both the baryon asymmetry of the Universe and dark matter in the form of gravitinos. The gravitinos from $Q$-ball decay dominate over the thermally produced population if the reheat temperature ${T}_{R}ensuremath{lesssim}{10}^{7} ext{ } ext{ }mathrm{GeV}$. We show that a gravitino with mass $ensuremath{sim}1 ext{ } ext{ }mathrm{GeV}$ is consistent with all observational bounds and can explain the baryon-to-dark-matter ratio in the gauge-mediated models of supersymmetry breaking for a wide range of cosmological and $Q$-ball parameters. Moreover, decaying $Q$-balls can be the dominant production mechanism for ${m}_{3/2}l1 ext{ } ext{ }mathrm{GeV}$ gravitinos if the $Q$-balls are formed from a $(Bensuremath{-}L)=0$ condensate, which produces no net baryon asymmetry. Gravitinos with masses in the range $50 ext{ } ext{ }mathrm{eV}ensuremath{lesssim}{m}_{3/2}ensuremath{lesssim}100 ext{ } ext{ }mathrm{keV}$ produced in this way can act as warm dark matter and can have observable imprint on the small-scale structure.