论文标题
改性重力中的反对称张量场：摘要
Antisymmetric tensor fields in modified gravity: a summary
论文作者
论文摘要
我们在修饰的重力理论中提供了第二等级反对称Kalb-ramond（KR）场的各个方面。与辐射和物质成分相比，发现KR场能密度随着宇宙的扩展而降低。因此，随着宇宙的发展和冷却，KR场对进化过程的贡献大大降低，目前几乎不会影响宇宙的演化。但是，KR场在早期的宇宙中具有重要的贡献，特别是它会影响通货膨胀的开始，并增加原始重力辐射的量，从而扩大张量与标量比不存在时的标量比的价值。关于KR场耦合，事实证明，在四维较高的曲率通货膨胀模型中，KR场与其他物质字段的耦合由$ 1/m_ {pl} $给出，即与通常的重力耦合相同。但是，在较高的较高曲率模型中，KR耦合在$ 1/m_ {pl} $上获得了额外的抑制，因此可以更好地解释为什么当前宇宙与4D较高曲率模型相比，当前宇宙几乎没有Kalb-Ramond领域的足迹。从有效的桥梁理论的角度来看，5D作用中较高的曲率项在额外尺寸模量场的动力学稳定机制中充当合适的稳定剂。根据KR领域的发展，可以是一个有趣的问题 - 坐在当今的宇宙中，我们如何确认Kalb -Ramond田地的存在，在我们当今的宇宙中具有相当低的能量密度，但在早期宇宙中产生了重大影响？我们试图通过“宇宙学量子纠缠”现象来回答这个问题，该现象确实带有早期宇宙的信息。
We provide various aspects of second rank antisymmetric Kalb-Ramond (KR) field in modified theories of gravity. The KR field energy density is found to decrease with the expansion of our universe at a faster rate in comparison to radiation and matter components. Thus as the Universe evolves and cools down, the contribution of the KR field on the evolutionary process reduces significantly, and at present it almost does not affect the universe evolution. However the KR field has a significant contribution during early universe, in particular, it affects the beginning of inflation as well as increases the amount of primordial gravitational radiation and hence enlarges the value of tensor to scalar ratio in respect to the case when the KR field is absent. In regard to the KR field couplings, it turns out that in four dimensional higher curvature inflationary model the couplings of the KR field to other matter fields is given by $1/M_{Pl}$ i.e same as the usual gravity-matter coupling. However in higher dimensional higher curvature model the KR couplings get an additional suppression over $1/M_{Pl}$ and thus gives a better explanation of why the present universe carries practically no footprint of the Kalb-Ramond field in comparison to the 4D higher curvature model. The higher curvature term in 5D action acts as a suitable stabilizing agent in the dynamical stabilization mechanism of the extra dimensional modulus field from the perspective of effective on-brane theory. Based on the evolution of KR field, one intriguing question can be - sitting in present day universe, how do we confirm the existence of the Kalb-Ramond field which has considerably low energy density in our present universe but has a significant impact during early universe ? We try to answer this question by the phenomena "cosmological quantum entanglement" which indeed carries the information of early universe.
