Avoiding instabilities in antisymmetric tensor field driven inflation
Avoiding instabilities in antisymmetric tensor field driven inflation
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DOI：
10.1140/epjc/s10052-019-7308-0
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发表时间：
2019-01
期刊：
影响因子：
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通讯作者：
Sandeep Aashish;Abhilash Padhy;S. Panda
中科院分区：
文献类型：
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作者：
Sandeep Aashish;Abhilash Padhy;S. Panda
在过去研究的具有反对称张量的暴涨模型中，即使在FRW未受扰动的背景下，也存在鬼影不稳定性。我们表明，通过考虑反对称张量场最一般的动量项，可以避免在未受扰动的FRW背景中出现重影。动力学部分获得了一个新的规范对称性破坏项，它对微扰模的作用是防止非动力学模的出现，从而避免鬼魂的出现。为了完备性，我们对梯度不稳定性进行了检验，并导出了扰动不存在梯度不稳定性的条件。
Models of inflation with antisymmetric tensor studied in the past are plagued with ghost instability even in an unperturbed FRW background. We show that it is possible to avoid ghosts in an unperturbed FRW background by considering the most general kinetic term for antisymmetric tensor field. The kinetic part acquires a new gauge symmetry violating term whose effect on perturbed modes is to prevent the appearance of nondynamical modes, and thus avoid ghosts. For completeness, we perform a check for gradient instability and derive the conditions for perturbations to be free of gradient instability.