Right-handed sneutrino as cold dark matter

Right-handed sneutrino as cold dark matter
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DOI:
10.1103/physrevd.73.051301
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发表时间:
2005-12
期刊:
影响因子:
5
通讯作者:
T. Asaka;Koji Ishiwata;T. Moroi
T. Asaka;Koji Ishiwata;T. Moroi
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
T. Asaka;Koji Ishiwata;T. Moroi

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我们考虑具有右手中微子的超对称模型,其中中微子质量纯粹是狄拉克类型的。在这个模型中,右手中微子可能是最轻的超对称粒子,也可能是宇宙中冷暗物质的一个可行候选者。右手中微子在早期宇宙中从来没有因为汤川相互作用的弱而被加热,而是由各种超粒子的衰变有效地产生的。结果表明,右手中微子目前的质量密度与观测到的暗物质密度是一致的。
We consider supersymmetric models with right-handed neutrinos where neutrino masses are purely Dirac-type. In this model, right-handed sneutrino can be the lightest supersymmetric particle and can be a viable candidate of cold dark matter of the universe. Right-handed sneutrinos are never thermalized in the early universe because of weakness of Yukawa interaction, but are effectively produced by decays of various superparticles. We show that the present mass density of right-handed sneutrino can be consistent with the observed dark matter density.