论文标题
三角洲重力中的观察性约束：CMB和超新星
Observational constraints in Delta Gravity: CMB and supernovas
论文作者
论文摘要
三角洲重力是一个重力模型，基于一个称为$ \tildeδ$的新对称性给出的一般相对论的扩展。在此模型中，新物质字段被添加到原始物质字段中，以其他对称性为动机。我们称它们为$ \tildeδ$ Matter Fields。该模型可以预测一个加速的宇宙，而无需引入宇宙常数。在这项工作中，我们使用分析水动力学方法研究了有关标量CMB TT功率谱的三角洲重力预测。为了将Planck卫星的数据与DG模型拟合，我们使用了Markov Chain Monte Carlo分析。我们还包括有关在三角洲重力环境中SNE-IA和CMB观测值之间兼容性的研究。最后，我们获得标量CMB TT功率谱以及解释SNE-IA数据和CMB测量所需的拟合参数。结果与考虑分析近似的两个观察结果都达到了合理的一致性。我们还讨论了哈勃常数和加速宇宙是否与三角洲重力背景下的观察证据一致。
Delta Gravity is a gravitational model based on an extension of General Relativity given by a new symmetry called $\tildeδ$. In this model, new matter fields are added to the original matter fields, motivated by the additional symmetry. We call them $\tildeδ$ matter fields. This model predicts an accelerating Universe without the need to introduce a cosmological constant. In this work, we study the Delta Gravity prediction about the scalar CMB TT power spectrum using an analytical hydrodynamical approach. To fit the Planck satellite's data with the DG model, we used a Markov Chain Monte Carlo analysis. We also include a study about the compatibility between SNe-Ia and CMB observations in the Delta Gravity Context. Finally, we obtain the scalar CMB TT power spectrum and the fitted parameters needed to explain both SNe-Ia Data and CMB measurements. The results are in a reasonable agreement with both observations considering the analytical approximation. We also discuss if the Hubble Constant and the Accelerating Universe are in concordance with the observational evidence in the Delta Gravity context.
