论文标题

研究对原始特征的限制,并具有未来的宇宙微波背景和星系调查

Investigating the Constraints on Primordial Features with Future Cosmic Microwave Background and Galaxy Surveys

论文作者

Chandra, Debabrata, Pal, Supratik

论文摘要

在本文中,我们对即将到来的宇宙微波背景(CMB)和星系调查的能力进行了详尽的研究,以探测原始功率谱系中的特征。原始特征是在标准幂律通货膨胀功率谱系之上的特定模型依赖性校正。功能形式由不同的通货膨胀情景给出。与无功能范围的任何显着偏离的签名将使我们能够破译通货膨胀宇宙的复杂性。在这里,我们深入研究了三个主要但独特的特征,即凸起功能,尖锐的特征信号和共振特征信号。为了分析功能,我们为每个功能模型采用一个特定模板。我们通过对即将到来的CMB任务(例如CMB-S4,Core-M5,LiteBird,pico与DESI和ESII和Euclid Galaxy Cornveys)采用Fisher矩阵预测分析来估计对特征参数的可能约束。为此,我们利用四个不同的观察结果来预测模型参数的边界,即CMB,Baryon声学振荡(BAO),星系聚类和重力弱透镜或宇宙剪切及其允许的协同。对于大规模结构(LSS)信息,我们考虑不同的红移的不同上限,以避免由于非线性尺度上的不确定性而引起的误差传播到特征参数上的约束中。对所有三个特征进行了比较分析,以估算这些即将进行的观察结果的相对能力,以阐明精确宇宙学的这一关键方面。

In this article, we do a thorough investigation of the competency of the forthcoming Cosmic Microwave Background (CMB) and Galaxy surveys in probing the features in the primordial power spectrum. Primordial features are specific model-dependent corrections on top of the standard power-law inflationary power spectrum; the functional form being given by different inflationary scenarios. Signature of any significant departure from the feature-less power spectrum will enable us to decipher the intricacies of the inflationary Universe. Here, we delve into three major yet distinct features, namely, Bump feature, Sharp feature signal, and Resonance feature signal. To analyse the features, we adopt a specific template for each feature model. We estimate the possible constraints on the feature parameters by employing Fisher matrix forecast analysis for the upcoming CMB missions such as CMB-S4, CORE-M5, LiteBIRD, PICO conjointly with DESI, and EUCLID galaxy surveys. To this end, we make use of four distinct observations to forecast on the bounds on the model parameters, namely, CMB, Baryon Acoustic Oscillations (BAO), Galaxy Clustering and Gravitational Weak Lensing or Cosmic Shear and their permissible synergy. For large scale structure (LSS) information, we consider different upper limits of scale for different redshifts for the purpose of circumventing the propagation of the errors stemming from the uncertainties on nonlinear scales into the constraints on the feature parameters. A comparative analysis of all three features has been done to estimate relative capabilities of these upcoming observations in shedding light on this crucial aspect of precision cosmology.

扫码加入交流群

加入微信交流群

微信交流群二维码

扫码加入学术交流群,获取更多资源