Stability conditions in the generalized SU(2) Proca theory
Stability conditions in the generalized SU(2) Proca theory
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DOI：
10.1103/physrevd.100.084048
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发表时间：
2019-07
影响因子：
5
通讯作者：
L. G. Gómez;Yeinzon Rodriguez Escuela de Fisica Universidad Industrial Santander-Yeinzon-Rodriguez-Escuela-de-Fisica-Universidad-103039473;Universidad Antonio Narino;The Abdus Salam International Centre for Theoretical Physics-The-Abdus-Salam-International-Centre-for-Physics-102342271
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作者：
L. G. Gómez;Yeinzon Rodriguez Escuela de Fisica Universidad Industrial Santander-Yeinzon-Rodriguez-Escuela-de-Fisica-Universidad-103039473;Universidad Antonio Narino;The Abdus Salam International Centre for Theoretical Physics-The-Abdus-Salam-International-Centre-for-Physics-102342271
在与伽利略-霍恩德斯基理论及其更现代的扩展相同的精神下，广义的 SU(2) 普罗卡理论是通过要求其作用不受奥斯特罗格拉茨基不稳定性的影响而建立的。然而，该理论还必须不存在其他不稳定问题，以确保其可行性。作为解决这个问题的第一种方法，我们专注于该理论的一个相当普遍的变体，并研究张量扇区中不存在鬼影和梯度不稳定性的一般条件，而无需解决动态背景。这种方法以及所研究的变体的现象学兴趣在于建立仅由非阿贝尔矢量场驱动的宇宙学模型的可能性，该模型可以解释宇宙的早期膨胀和晚期加速膨胀的成功描述。
Under the same spirit of the Galileon-Horndeski theories and their more modern extensions, the generalized SU(2) Proca theory was built by demanding that its action may be free of the Ostrogradski's instability. Nevertheless, the theory must also be free of other instability problems in order to ensure its viability. As a first approach to address this issue, we concentrate on a quite general variant of the theory and investigate the general conditions for the absence of ghost and gradient instabilities in the tensor sector without the need for resolving the dynamical background. The phenomenological interest of this approach as well as of the variant investigated lies on the possibility of building cosmological models driven solely by non-Abelian vector fields that may account for a successful description of both the early inflation and the late-time accelerated expansion of the universe.