论文标题
公制型二次重力的通胀
Inflation in Metric-Affine Quadratic Gravity
论文作者
论文摘要
在度量和连接是自变量的重力理论的一般框架中，我们考虑在RICCI标量曲率和HOLST不变性（Riemann Curvature contraction the Levi-civita and covi-civita and covita and vivita and-civita and contensor couplatimantal pinsor）中的动作。我们研究了等效有效度量理论的曲线，具有额外的动力学伪尺度自由度，并表明它减少了有效的单场通货膨胀模型。我们详细分析了通货膨胀预测，并发现它们属于广泛参数的最新观察界，从而增加了张量与量表比的增加。光谱指数可以根据参数空间的位置减小或增加。
In the general framework of Metric-Affine theories of gravity, where the metric and the connection are independent variables, we consider actions quadratic in the Ricci scalar curvature and the Holst invariant (the contraction of the Riemann curvature with the Levi-Civita antisymmetric tensor) coupled non-minimally to a scalar field. We study the profile of the equivalent effective metric theory, featuring an extra dynamical pseudoscalar degree of freedom, and show that it reduces to an effective single-field inflationary model. We analyze in detail the inflationary predictions and find that they fall within the latest observational bounds for a wide range of parameters, allowing for an increase in the tensor-to-scalar ratio. The spectral index can either decrease or increase depending on the position in parameter space.
