标量场耦合 $f\left(Q, \tilde R\right)$ 引力中的 ACT 兼容暴胀
ACT-compatible Inflation in Scalar Field Coupled $f\left(Q, \tilde R\right)$ Gravity
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中文总结 AI 辅助
本研究在 $f(Q,\tilde R)$ 引力框架下,利用重构技术构建满足 ACT 暴胀约束的哈勃率模型,并讨论再加热阶段,解决了 $f(Q)$ 引力中动力学自由度不确定带来的非平凡问题。
中文摘要 AI 辅助
在这项工作中,我们在 $f\left(Q, \tilde R\right)$ 引力框架下构建了与 ACT 对暴胀的约束兼容的模型,其中 $f(R)$ 引力与标量场耦合。$f\left(Q, \tilde R\right)$ 理论等价于 $f(Q, B)$ 引力模型或 $f(Q, C)$ 引力,其中 $B$ 或 $C$ 是爱因斯坦引力中 $Q$ 与标量曲率 $\tilde R$ 之差,因此 $B=Q-\tilde R$ 或 $C=\tilde R - Q$。利用与 $f\left(Q, \tilde R\right)$ 理论兼容的适当重构技术,我们提出了满足约束的两种哈勃率 $H$ 的函数行为,并使用 $f\left(Q, \tilde R\right)$ 引力和与标量场耦合的 $f(R)$ 引力构建了实现这些哈勃率 $H$ 行为的模型。我们还讨论了暴胀后的再加热阶段。尽管与标量场耦合的 $f(R)$ 引力场景是众所周知的,因为该模型可以改写为与两个标量场耦合的爱因斯坦引力形式,但在 $f\left(Q, \tilde R\right)$ 引力情形中会出现非平凡问题,因为 $f(Q)$ 引力中的动力学自由度数目尚未确定。
英文摘要
In this work, we construct models compatible with ACT constraints on inflation in the framework of $f\left(Q, \tilde R\right)$ gravity, with $f(R)$ gravity coupled to a scalar field. The $f\left(Q, \tilde R\right)$ theory is equivalent to $f(Q, B)$ gravity models or $f(Q, C)$ gravity where $B$ or $C$ is the difference between $Q$ and the scalar curvature $\tilde R$ in Einstein's gravity, so, $B=Q-\tilde R$ or $C=\tilde R - Q$. Using appropriate reconstruction techniques compatible with $f\left(Q, \tilde R\right)$ theory, we propose two functional behaviors of the Hubble rate $H$ that satisfy the constraints, and we construct models that realize these behaviors of the Hubble rate $H$ using $f\left(Q, \tilde R\right)$ gravity and $f(R)$ gravity coupled with a scalar field. We also discuss the reheating stage after inflation. Although the scenario of $f(R)$ gravity coupled with a scalar field is well-known, since the model can be rewritten in the form of Einstein's gravity coupled with two scalar fields, the non-trivial problem occurs in the $f\left(Q, \tilde R\right)$ gravity case, because the number of dynamical degrees of freedom in $f(Q)$ gravity is not settled.
发表机构
- High Energy Accelerator Research Organization (KEK)(高能加速器研究机构)
- Nagoya University(名古屋大学)
- ICREA(加泰罗尼亚高级研究院)
- Institute of Space Sciences (IEEC-CSIC)(空间科学研究所)
- Institut d’Estudis Espacials de Catalunya (IEEC)(加泰罗尼亚空间研究学院)
- Aristotle University of Thessaloniki(塞萨洛尼基亚里士多德大学)
- Khazar University(阿塞拜疆可汗大学)
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