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arXiv 1504.05958hep-thastro-ph.COhep-ph
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超对称暴胀的Goldstone和Goldstino

The goldstone and goldstino of supersymmetric inflation

Yonatan Kahn, Daniel A. Roberts, Jesse Thaler

摘要:

我们构造了超对称暴胀的最小有效场论(EFT),它的场内容是一个实标量,时间平移破缺的Goldstone,和一个Weyl费米子,超对称性的Goldstino(SUSY)破缺.膨胀的背景可以被看作是一个单一的超对称性破坏部门,和自由度可以有效地参数化使用约束超场。我们的EFT由包含goldstino且满足X_NL^2 = 0的手征超场X_NL和包含goldstino和goldstone且满足X_NL B_NL = B_NL^3 = 0的实超场B_NL组成。我们匹配的结果,从我们的EFT形式主义现有的超对称性的结果打破了流体背景,表明goldstino传播亚光速。同样的效果也可以从幺正规范引力子作用量中得到,在将我们的EFT嵌入超引力之后。如果引力子质量是可比的哈勃尺度在通货膨胀期间,我们确定了一个新的参数EFT相关的引力子质量参数的时间依赖性阶段。我们简要地评论了Goldstino环对暴胀观测的主要贡献。

英文摘要:

We construct the minimal effective field theory (EFT) of supersymmetric inflation, whose field content is a real scalar, the goldstone for time-translation breaking, and a Weyl fermion, the goldstino for supersymmetry (SUSY) breaking. The inflating background can be viewed as a single SUSY-breaking sector, and the degrees of freedom can be efficiently parameterized using constrained superfields. Our EFT is comprised of a chiral superfield X_NL containing the goldstino and satisfying X_NL^2 = 0, and a real superfield B_NL containing both the goldstino and the goldstone, satisfying X_NL B_NL = B_NL^3 = 0. We match results from our EFT formalism to existing results for SUSY broken by a fluid background, showing that the goldstino propagates with subluminal velocities. The same effect can also be derived from the unitary gauge gravitino action after embedding our EFT in supergravity. If the gravitino mass is comparable to the Hubble scale during inflation, we identify a new parameter in the EFT related to a time-dependent phase of the gravitino mass parameter. We briefly comment on the leading contributions of goldstino loops to inflationary observables.

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