Euclid: Forecasts for $k$-cut $3 \times 2$ Point Statistics
P. L. Taylor, T. Kitching, V. F. Cardone, A. Ferté, E. M. Huff, F. Bernardeau, J. Rhodes, A. C. Deshpande, I. Tutusaus, A. Pourtsidou, S. Camera, C. Carbone, S.… 展开作者
P. L. Taylor, T. Kitching, V. F. Cardone, A. Ferté, E. M. Huff, F. Bernardeau, J. Rhodes, A. C. Deshpande, I. Tutusaus, A. Pourtsidou, S. Camera, C. Carbone, S. Casas, M. Martinelli, V. Pettorino, Z. Sakr, D. Sapone, V. Yankelevich, N. Auricchio, A. Balestra, C. Bodendorf, D. Bonino, A. Boucaud, E. Branchini, M. Brescia, V. Capobianco, J. Carretero, M. Castellano, S. Cavuoti, A. Cimatti, R. Cledassou, G. Congedo, L. Conversi, L. Corcione, M. Cropper, E. Franceschi, B. Garilli, B. Gillis, C. Giocoli, L. Guzzo, S. V. H. Haugan, W. Holmes, F. Hormuth, K. Jahnke, S. Kermiche, M. Kilbinger, M. Kunz, H. Kurki-Suonio, S. Ligori, P. B. Lilje, I. Lloro, O. Marggraf, K. Markovic, R. Massey, E. Medinaceli, S. Mei, M. Meneghetti, G. Meylan, M. Moresco, B. Morin, L. Moscardini, S. Niemi, C. Padilla, S. Paltani, F. Pasian, K. Pedersen, W. J. Percival, S. Pires, G. Polenta, M. Poncet, L. Popa, F. Raison, M. Roncarelli, E. Rossetti, R. Saglia, P. Schneider, A. Secrou, G. Seidel, S. Serrano, C. Sirignano, G. Sirri, F. Sureau, P. Tallada Crespí, D. Tavagnacco, A. N. Taylor, H. I. Teplitz, I. Tereno, R. Toledo-Moreo, E. A. Valentijn, L. Valenziano, T. Vassallo, Y. Wang, J. Weller, A. Zacchei, J. Zoubian
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10 pages, 5 figures. Accepted by the Open Journal of Astrophysics
Modelling uncertainties at small scales, i.e. high $k$ in the power spectrum $P(k)$, due to baryonic feedback, nonlinear structure growth and the fact that galaxies are biased tracers poses a significant obstacle to fully leverage the constraining power of the {\it Euclid} wide-field survey. $k$-cut cosmic shear has recently been proposed as a method to optimally remove sensitivity to these scales while preserving usable information. In this paper we generalise the $k$-cut cosmic shear formalism to $3 \times 2$ point statistics and estimate the loss of information for different $k$-cuts in a $3 \times 2$ point analysis of the {\it Euclid} data. Extending the Fisher matrix analysis of~\citet{blanchard2019euclid}, we assess the degradation in constraining power for different $k$-cuts. We work in the idealised case and assume the galaxy bias is linear, the covariance is Gaussian, while neglecting uncertainties due to photo-z errors and baryonic feedback. We find that taking a $k$-cut at $2.6 \ h \ {\rm Mpc} ^{-1}$ yields a dark energy Figure of Merit (FOM) of 1018. This is comparable to taking a weak lensing cut at $\ell = 5000$ and a galaxy clustering and galaxy-galaxy lensing cut at $\ell = 3000$ in a traditional $3 \times 2$ point analysis. We also find that the fraction of the observed galaxies used in the photometric clustering part of the analysis is one of the main drivers of the FOM. Removing $50 \% \ (90 \%)$ of the clustering galaxies decreases the FOM by $19 \% \ (62 \%)$. Given that the FOM depends so heavily on the fraction of galaxies used in the clustering analysis, extensive efforts should be made to handle the real-world systematics present when extending the analysis beyond the luminous red galaxy (LRG) sample.
Euclid: Validation of the MontePython forecasting tools
欧洲航天局的欧几里德飞行任务将对弱透镜宇宙剪切和星系团进行调查，以约束宇宙学模型和基本物理学。我们扩大和调整模拟欧几里德的可能性的MontePython软件，以匹配在以前的欧几里德费舍尔矩阵预测的几个探针的确切配方：弱透镜宇宙剪切，光度星系聚类，后者之间的互相关性观测，和光谱星系聚类。我们还建立了在欧几里得的上下文中运行爱因斯坦-玻尔兹曼解算器CLASS和CAMB时所需的精度设置。对于最小的宇宙模型，扩展到包括动态暗能量，我们直接进行Fisher矩阵预测的基础上的二阶导数的可能性相对于模型参数的数值评估。我们将我们的结果与其他预测方法和工具的结果进行比较。我们表明，这样的MontePython预测同意非常好，与以前的Fisher预测出版的欧几里得协作，而且，与新的预测产生的CosmicFish代码，现在直接与两个爱因斯坦-玻尔兹曼求解器CAMB和类。此外，为了建立高斯近似的有效性，我们证明了Fisher矩阵边际误差轮廓与使用MontePython运行Monte Carlo Markov Chains时获得的可信区域一致，同时使用完全相同的模拟似然。这里提出的新的欧几里得预测管道可以与其他宇宙学参数一起使用，以探索扩展的宇宙学模型。
Forecast on the generalised dark matter properties from a Euclid-like survey
Instituto de Física Teórica UAM-CSIC（UAM-CSIC理论物理研究所）；Institut de Recherche en Astrophysique et Planétologie (IRAP), Université de Toulouse, CNRS, UPS, CNES（图卢兹大学、法国国家科学研究中心、UPS、CNES天体物理学和行星学研究所在）；Université St Joseph（贝鲁特圣约瑟夫大学理学院）；Faculty of Sciences, Beirut（捷克科学院物理研究所）；Institute of Physics of the Czech Academy of Sciences
Cosmology with the angular cross-correlation of gravitational-wave and galaxy catalogs: Forecasts for next-generation interferometers and the Euclid survey
Aix-Marseille Université, Université de Toulon, CNRS, CPT（艾克斯-马赛大学，土伦大学，法国国家科学研究中心，理论物理中心）；Dipartimento di Fisica “G. Occhialini”, Universitá degli Studi di Milano-Bicocca（米兰比可卡大学 G. Occhialini 物理系）；INFN, Sezione di Milano-Bicocca（意大利国家核物理研究所，米兰比可卡分部）
