![]() However, despite its lasting experimental successes, some fundamental open issues are motivating challenging efforts aimed at searching for possible expansions or radically alternative models ( Amendola et al. After almost one century from its original formulation, Einstein’s general relativity (GR) is still the dominant theory for describing gravity. The understanding of gravity is thus key to unveiling the nature of the Universe and its cosmological evolution. The dynamics of the Universe is shaped by the gravity force. Key words: cosmology: theory / cosmology: observations / dark matter / dark energy / large-scale structure of Universe This can have a strong impact on multiple tracer analyses, and when combining catalogues selected at different redshifts. Concurrently, we show that it is possible to achieve almost unbiased constraints on f σ 8 provided that the analysis is restricted to a proper range of scales that depends non-trivially on the properties of the sample. If the latter is kept fixed, the error depends on both redshift and sample selection due to the scale-dependent impact of non-linearities if not properly modelled. We find that the systematic error on f σ 8 depends significantly on the range of scales considered for the fit. We estimated f σ 8 by modelling both the monopole and the full two-dimensional anisotropic clustering, using the dispersion model. Specifically, we measured the redshift-space two-point correlation function of mock samples of galaxies, galaxy clusters and active galactic nuclei, extracted from the Magneticum simulation, in the redshift range 0.2 ≤ z ≤ 2, and adopting different sample selections. We used a large hydrodynamic simulation to investigate how the systematic error on the linear growth rate, f, caused by model uncertainties, depends on sample selections and co-moving scales. However, to extract unbiased physical constraints, the clustering pattern has to be modelled accurately, taking into account the effects of non-linear dynamics at small scales, and properly describing the link between the selected cosmic tracers and the underlying dark matter field. Redshift-space clustering anisotropies caused by cosmic peculiar velocities provide a powerful probe to test the gravity theory on large scales. 1, 81679 München, Germanyĥ Max-Planck-Institut für Astrophysik, Karl-Schwarzschild Strasse 1, 85748 Garching bei München, GermanyĪims. Astronomical objects: linking to databasesįederico Marulli 1 ,2 ,3, Alfonso Veropalumbo 1, Lauro Moscardini 1 ,2 ,3, Andrea Cimatti 1 and Klaus Dolag 4 ,5ġ Dipartimento di Fisica e Astronomia - Università di Bologna, viale Berti Pichat 6/2, 40127 Bologna, ItalyĮ-mail: INAF–Osservatorio Astronomico di Bologna, via Ranzani 1, 40127 Bologna, Italyģ INFN–Sezione di Bologna, viale Berti Pichat 6/2, 40127 Bologna, ItalyĤ Department of Physics, Ludwig-Maximilians-Universität, Scheinerstr.Including author names using non-Roman alphabets.Suggested resources for more tips on language editing in the sciences Punctuation and style concerns regarding equations, figures, tables, and footnotes $S_8$ is insensitive to the cosmological model. Parameterization based on cosmic Age (PAge), an almost model-independentĭescription of the late universe, we find that the RSD + SN + BAO constraint on Hence is consistent with the CMB constraint. For $\Lambda$CDM cosmology we find $S_8=Ġ.812 \pm 0.026$, which is $\sim 2\sigma$ larger than previous studies, and ![]() Oscillations (BAO), whose correlation with RSD is also taken into account, toĬonstrain the background geometry. Up-to-date data sets of Type Ia supernovae (SN) and baryon acoustic Model dependence, we add in our Monte Carlo Markov Chain calculation the most ![]() The RSD constraint on $S_8$ with the most up-to-date RSD data set where theĬorrelation between data points are properly taken into account. Result is sensitive to the cosmological model. Smaller $S_8$ that is $\sim 2$-$3\sigma$ lower than the CMB value, but the $\Lambda$CDM cosmology, redshift-space distortion (RSD) data also prefers a $S_8$ constrained by the cosmic microwave background (CMB) data and the smaller ($\Lambda$CDM) cosmology is the tension between the structure growth parameter Download a PDF of the paper titled The $S_8$ Tension in Light of Updated Redshift-Space Distortion Data and PAge Approximation, by Lu Huang and 3 other authors Download PDF Abstract: One of the most prominent challenges to the standard Lambda cold dark matter
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