Hubble-induced mass from MSSM plasma
Hubble-induced mass from MSSM plasma
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MSSM 等离子体的哈勃感应质量
DOI：
10.1088/1475-7516/2013/04/008
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发表时间：
2013
影响因子：
6.4
通讯作者：
Tomohiro Takesako
中科院分区：
文献类型：
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作者：
T. Fujita;M. Kawasaki;Y. Tada and T. Takesako;Tomohiro Takesako
通过普朗克抑制的相互作用，我们计算了与热等离子体耦合的标量场ϕ的有效质量。我们发现重新标度耦合场是有用的，这样所有依赖于ϕ的能量都被吸收到汤川耦合和规范耦合中，这使得我们能够从用重标度耦合计算的2圈自由能中读出对有效质量ϕ的前序贡献。当ϕ通过非最小Kähler势耦合到MSSM手征超场时，我们给出了ϕ在足够高的温度下的解析表达式。我们发现，就典型参数组的耦合而言，|tide mϕ2|约为10−3 H2∼10−2 H2，其中H是辐射为主时代的哈勃展开率。
We evaluate the effective mass of a scalar field ϕ coupled to thermal plasma through Planck-suppressed interactions. We find it useful to rescale the coupled fields so that all the ϕ-dependences are absorbed into the yukawa and gauge couplings, which allows us to read off the leading order contributions to the effective mass tilde m ϕ from the 2-loop free energy calculated with the rescaled couplings. We give an analytical expression for tilde m ϕ at a sufficiently high temperature in the case where ϕ is coupled to the MSSM chiral superfields through non-minimal Kähler potential. We find that| tilde m ϕ 2| is about 10− 3 H 2∼ 10− 2 H 2 at the leading order in terms of the couplings for typical parameter sets, where H is the Hubble expansion rate in the radiation-dominated era.