arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1505.03386hep-thastro-ph.COgr-qc
收藏

暴胀准尺度不变吸引子

Inflationary quasi-scale invariant attractors

Massimiliano Rinaldi, Luciano Vanzo, Sergio Zerbini, Giovanni Venturi

摘要:

在最近的一系列论文中,卡洛什、林德及其合作者仅用一个参数$α$,就提供了从幂律到超引力的几种势的单场暴胀的统一描述。这些所谓的$α$ -吸引子预测了光谱指数$n_{s}$和张量标量比$r$,它们与最新的普朗克数据完全兼容。所有的$α$ -吸引子的唯一共同特征是一个非正则的动力学项,它有一个极点和一个围绕极点的解析势。本文从具有非正则标量动能的爱因斯坦坐标系出发,研究了非解析势的情形。我们发现的功能形式,对应于准尺度不变的引力模型在约旦框架,其特征在于$r$和$n_{s}$,适合的观测数据之间的普遍关系,但显然是不同的$α$ -吸引子之一。已知Jordan标架中精确经典标度不变性的破缺可归因于单圈修正。因此,我们得出结论,在非正则爱因斯坦框架中存在一类非解析势,它们在物理上等价于约旦框架中的一类模型,其标度不变性被单圈量子修正软打破。

英文摘要:

In a series of recent papers Kallosh, Linde, and collaborators have provided a unified description of single-field inflation with several types of potentials, ranging from power law to supergravity, in terms of just one parameter $α$. These so-called $α$-attractors predict a spectral index $n_{s}$ and a tensor-to-scalar ratio $r$, which are fully compatible with the latest Planck data. The only common feature of all $α$-attractors is a non-canonical kinetic term with a pole, and a potential analytic around the pole. In this paper, starting from the same Einstein frame with a non-canonical scalar kinetic energy, we explore the case of non-analytic potentials. We find the functional form that corresponds to quasi-scale invariant gravitational models in the Jordan frame, characterised by a universal relation between $r$ and $n_{s}$ that fits the observational data but is clearly distinct from the one of the $α$-attractors. It is known that the breaking of the exact classical scale-invariance in the Jordan frame can be attributed to one-loop corrections. Therefore we conclude that there exists a class of non-analytic potentials in the non-canonical Einstein frame that are physically equivalent to a class of models in the Jordan frame, with scale-invariance softly broken by one-loop quantum corrections.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑