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arXiv 1409.3183gr-qcastro-ph.COhep-th
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动力学破缺超引力中引力子凝聚引起的暴胀

Inflation via Gravitino Condensation in Dynamically Broken Supergravity

Jean Alexandre, Nick Houston, Nick E. Mavromatos

摘要:

通过超希格斯效应引起的引力凝聚引起的暴胀是一种紫外激发的场景,既可以使早期宇宙暴胀,也可以动态地破坏局部超对称性,完全独立于与外部物质的任何耦合。作为一个额外的好处,这也从粒子谱中删除了(尚未观察到的)与全局超对称性破缺相关的无质量Goldstino。在这篇评论中,我们详细介绍了相关的属性,并概述了在此背景下所需的各个步骤的先前隐藏的细节,以便与当前的暴胀现象学建立联系。我们使用的SUGRA类模型是最小的四维N=1超引力及其共形扩展(破缺共形对称)。在那里,引力子凝聚体本身可以扮演暴胀子的角色,然而慢滚的要求需要不自然的大值波函数重整化。然而,还有另一种可能提供Starobinsky型暴胀的情况,发生在破SUGRA阶段,在引力子凝聚有效势的非平凡最小值附近。在这种情况下,由于在路径积分中对大质量量子引力子场进行积分,对有效作用量的曲率修正更高,这对暴胀阶段的开始至关重要。后一种情况是兼容的普朗克卫星现象,但不与BICEP 2数据。

英文摘要:

Gravitino-condensate-induced inflation via the super-Higgs effect is a UV-motivated scenario for both inflating the early universe and breaking local supersymmetry dynamically, entirely independent of any coupling to external matter. As an added benefit, this also removes the (as of yet unobserved) massless Goldstino associated to global supersymmetry breaking from the particle spectrum. In this review we detail the pertinent properties and outline previously hidden details of the various steps required in this context in order to make contact with current inflationary phenomenology. The class of models of SUGRA we use to exemplify our approach are minimal four-dimensional N=1 supergravity and conformal extensions thereof (with broken conformal symmetry). Therein, the gravitino condensate itself can play the role of the inflaton, however the requirement of slow-roll necessitates unnaturally large values of the wave-function renormalisation. Nevertheless, there is an alternative scenario that may provide Starobinsky-type inflation, occurring in the broken-SUGRA phase around the non-trivial minima of the gravitino-condensate effective potential. In this scenario higher curvature corrections to the effective action, crucial for the onset of an inflationary phase, arise as a result of integrating out massive quantum gravitino fields in the path integral. The latter scenario is compatible with Planck satellite phenomenology but not with BICEP2 data.

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