星系团引力和压力分布的广义标量张量理论
Generalised scalar-tensor theories of gravity and pressure profiles of galaxy clusters
摘要：
在当前的会议记录中，我们总结了在mm Universe@NIKA2会议期间展示的结果，这些结果来自我们在\cite{Haridasu:2021hzq}中的主要结果。我们测试的简并高阶标量张量（DHOST）理论作为广义平台的标量张量理论在星系团尺度预测在这样的静态系统的小尺度修改的引力势。{DHOST理论不仅是$Λ$ CDM的一个很好的替代方案，而且可以预测静态系统（如星系团）中引力势的小尺度修正。}使用具有精确X射线团簇内介质（ICM）数据的12个团簇样本（X-COP项目）和Sunyaev-Zel'dovich（SZ）ICM压力（普朗克卫星），我们对定义GR偏差的DHOST参数进行了初步约束。此外，我们还收集了一些我们在课程中进行的补充分析：i）没有参数假设的高斯过程重建，ii）$\Psz$ -仅数据分析，不受X射线数据的辅助。最后，我们提出了可能的扩展，目前的工作，可能会受益于未来的高灵敏度和空间分辨率的观测，如正在进行的NIKA 2相机。
英文摘要：
In the current proceedings, we summarise the results presented during the mm Universe@NIKA2 conference, taken from our main results in \cite{Haridasu:2021hzq}. We test the Degenerate higher-order scalar-tensor(DHOST) theory as a generalised platform for scalar-tensor theory at galaxy cluster scales to predict in such static systems small scale modification to the gravitational potential. {DHOST theory is not only a good alternative to $Λ$CDM for the background evolution but also predicts small-scale modification to the gravitational potential in static systems such as galaxy clusters.} With a sample of 12 clusters with accurate X-ray Intra Cluster Medium (ICM) data (X-COP project) and Sunyaev-Zel'dovich (SZ) ICM pressure (Planck satellite), we place preliminary constraints on the DHOST parameters defining the deviation from GR. Moreover, we also collect a few supplementary analyses we have performed during the course: i) Gaussian process reconstruction without parametric assumptions, ii) $\Psz$-only data analysis not aided by the X-ray data. Finally, we present possible extensions to the current work which may benefit from future high sensitivity and spatial resolution observations such as the ongoing NIKA2 camera.
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