J-PAS: forecasts on interacting dark energy from baryon acoustic oscillations and redshift-space distortions
A. A. Costa, R. J. F. Marcondes, R. G. Landim, E. Abdalla, L. R. Abramo, H. S. Xavier, A. A. Orsi, N. Chandrachani Devi, A. J. Cenarro, D. Cristobal-Hornillos, … 展开作者
A. A. Costa, R. J. F. Marcondes, R. G. Landim, E. Abdalla, L. R. Abramo, H. S. Xavier, A. A. Orsi, N. Chandrachani Devi, A. J. Cenarro, D. Cristobal-Hornillos, R. A. Dupke, A. Ederoclite, A. Marin-Franch, C. M. Oliveira, H. Vazquez Ramio, K. Taylor, J. Varela
We estimate the constraining power of J-PAS for parameters of an interacting dark energy cosmology. The survey is expected to map several millions of luminous red galaxies, emission line galaxies and quasars in an area of thousands of square degrees in the northern sky with precise photometric redshift measurements. Forecasts for the DESI and Euclid surveys are also evaluated and compared to J-PAS. With the Fisher matrix approach, we find that J-PAS can place constraints on the interaction parameter comparable to those from DESI, with an absolute uncertainty of about $0.02$, when the interaction term is proportional to the dark matter energy density, and almost as good, of about $0.01$, when the interaction is proportional to the dark energy density. For the equation of state of dark energy, the constraints from J-PAS are slightly better in the two cases (uncertainties $0.04$ - $0.05$ against $0.05$ - $0.07$ around the fiducial value $-1$). Both surveys stay behind Euclid but follow it closely, imposing comparable constraints in all specific cases considered.
Forecasts for CMB μ- and i-type spectral distortion constraints on the primordial power spectrum on scales 8 < k < 10^4 Mpc^-1 with the future Pixie-like experiments
红移为1.5 x 10^4 < z < 2 x 10^6的丝绸阻尼消除了对应于同向波数8 < k < 10^4 Mpc^-1(10^5 < \ell < 10^8)尺度上的CMB各向异性。这种耗散的能量被CMB吸收,在μ型和i型CMB光谱中产生黑体畸变。我们研究,使用Fisher矩阵,我们可以从测量这些频谱失真的原始功率谱从未来的实验,如Pixie的约束,以及这些约束如何改变,因为我们改变的频率分辨率和灵敏度的实验。我们表明,额外的信息的形状的$i$型失真,结合μ型失真,使我们能够打破这些尺度上的功率谱的幅度和谱指数之间的简并性,并导致更严格的约束。考虑到y型畸变的部分简并度和CMB黑体部分的温度,我们量化了μ型畸变和i型畸变中包含的信息。我们还计算了原始功率谱的约束时,光谱失真的信息相结合的CMB各向异性测量的WMAP,SPT,ACT和普朗克实验。
National Astronomical Observatories, Chinese Academy of Sciences(中国科学院国家天文台);University of Chinese Academy of Sciences(中国科学院大学);Beijing Normal University(北京师范大学);Institute for Fundamental Physics of the Universe(宇宙基础物理研究所);Donostia International Physics Center (DIPC)(圣塞巴斯蒂安国际物理中心)
Teasing bits of information out of the CMB energy spectrum
来自黑体的宇宙微波背景(CMB)频谱图--通常被称为频谱失真--编码了早期宇宙(红移z <几x 10 ^6)的热历史信息。虽然信号通常被表征为mu和y型失真,但在中间红移10^4 < z < 3 x 10^5处也可以产生较小的残余(非y/非mu)失真。在这里,我们构造了一组新的观测量,mu_k,它描述了这个残余失真的主要成分。主成分与温度偏移、y型和mu型失真正交,并根据其可检测性进行排名,从而压缩CMB光谱提供的所有有价值的信息。该方法提供了一种有效的方法来分析给定的实验设置的光谱失真,并可以应用到广泛的能量释放的情况。作为一个例子,我们讨论了小尺度声波和衰变/湮灭粒子的PIXIE型实验的耗散所造成的频谱失真签名的分析。我们提供预测的模型参数和检测限在每种情况下的预期测量不确定性。我们还表明,PIXIE型实验原则上可以区分耗散能量释放粒子衰变的一个几乎标度不变的原始功率谱与小运行。因此,未来的CMB光谱学提供了一个独特的探测原始宇宙中的物理过程。