scholarly journals The completed SDSS-IV extended Baryon Oscillation Spectroscopic Survey: a multitracer analysis in Fourier space for measuring the cosmic structure growth and expansion rate

2021 ◽  
Vol 504 (1) ◽  
pp. 33-52
Author(s):  
Gong-Bo Zhao ◽  
Yuting Wang ◽  
Atsushi Taruya ◽  
Weibing Zhang ◽  
Héctor Gil-Marín ◽  
...  
Keyword(s):  
Growth Rate ◽  
Power Spectrum ◽  
Confidence Level ◽  
Expansion Rate ◽  
Fourier Space ◽  
Redshift Range ◽  
Significance Level ◽  
Data Product ◽  
New Development ◽  
Cross Power Spectrum

ABSTRACT We perform a joint BAO and RSD analysis using the eBOSS DR16 LRG and ELG samples in the redshift range of z ∈ [0.6, 1.1], and detect an RSD signal from the cross-power spectrum at a ∼4σ confidence level, i.e., fσ8 = 0.317 ± 0.080 at zeff = 0.77. Based on the chained power spectrum, which is a new development in this work to mitigate the angular systematics, we measure the BAO distances and growth rate simultaneously at two effective redshifts, namely, DM/rd (z = 0.70) = 17.96 ± 0.51, DH/rd (z = 0.70) = 21.22 ± 1.20, fσ8 (z = 0.70) = 0.43 ± 0.05, and DM/rd (z = 0.845) = 18.90 ± 0.78, DH/rd (z = 0.845) = 20.91 ± 2.86, fσ8 (z = 0.845) = 0.30 ± 0.08. Combined with BAO measurements including those from the eBOSS DR16 QSO and Lyman-α sample, our measurement has raised the significance level of a non-zero ΩΛ to ∼11σ. The data product of this work is publicly available at https://github.com/icosmology/eBOSS_DR16_LRGxELG and https://www.sdss.org/science/final-bao-and-rsd-measurements/.

scholarly journals MEASUREMENT OF A REDSHIFT-SPACE POWER SPECTRUM FOR BOSS GALAXIES AND THE GROWTH RATE AT REDSHIFT 0.57

2016 ◽  
Vol 833 (2) ◽  
pp. 287 ◽  
Author(s):  
Zhigang Li ◽  
Y. P. Jing ◽  
Pengjie Zhang ◽  
Dalong Cheng
Keyword(s):  
Growth Rate ◽  
Power Spectrum

PENGARUH UPAH MINIMUM TERHADAP TINGKAT PRODUKTIVITAS KERJA PT. TELKOM CABANG BOGOR

PARAMETER ◽  
2021 ◽  
Vol 5 (2) ◽  
pp. 1-13
Author(s):  
Rini Ardista
Keyword(s):  
Linear Regression ◽  
Minimum Wage ◽  
Confidence Level ◽  
Work Productivity ◽  
Sampling Technique ◽  
Simple Linear Regression ◽  
Significance Level ◽  
Production Section ◽  
F Distribution ◽  
Linearity Test

This research aims to determine whether the minimum wage is related to the level of work productivity of the production department at PT. TELKOM CABANG BOGOR, to find out whether the minimum wage affects the work productivity of the employees of PT. TELKOM CABANG BOGOR. The sample used was 100 respondents taken by accidental sampling technique in the PT. TELKOM CABANG BOGOR. This research uses simple linear regression. A tool to measure it is assisted by SPSS version 22. The results of the linearity test of the effect of the minimum wage on work productivity, there is a significance value of 0.115 which is greater than 0.05, so there is a linear relationship. The results of the t test show that the minimum wage has a significance level of 0.115 and the t value of 3.345> t table of 1.984 is greater than 0.05. From the results of the F test it can also be concluded that the F-table at df1 = 2 df2 = 97 is obtained from the F distribution table of 3.09 at the 95% confidence level (Alpha = 5%). This proves that Fcount (88,986)> from Ftable (3.09), while the significance (0,000) <from alpha is at the 95% confidence level (Alpha 5%). So that Ha which says there is a significant influence between the minimum wage on the work productivity of the production section at PT. TELKOM CABANG BOGOR accepted. While Ho, which says there is no significant effect between minimum wages on work productivity at PT. TELKOM CABANG BOGOR rejected.

scholarly journals Impact of relativistic effects on the primordial non-Gaussianity signature in the large-scale clustering of quasars

2020 ◽  
Vol 499 (2) ◽  
pp. 2598-2607
Author(s):  
Mike (Shengbo) Wang ◽  
Florian Beutler ◽  
David Bacon
Keyword(s):  
Dark Energy ◽  
Power Spectrum ◽  
Luminosity Function ◽  
Large Scale ◽  
Relativistic Effects ◽  
Redshift Range ◽  
Cosmological Background ◽  
Relativistic Corrections ◽  
The Galaxy ◽  
The Impact

ABSTRACT Relativistic effects in clustering observations have been shown to introduce scale-dependent corrections to the galaxy overdensity field on large scales, which may hamper the detection of primordial non-Gaussianity fNL through the scale-dependent halo bias. The amplitude of relativistic corrections depends not only on the cosmological background expansion, but also on the redshift evolution and sensitivity to the luminosity threshold of the tracer population being examined, as parametrized by the evolution bias be and magnification bias s. In this work, we propagate luminosity function measurements from the extended Baryon Oscillation Spectroscopic Survey (eBOSS) to be and s for the quasar (QSO) sample, and thereby derive constraints on relativistic corrections to its power spectrum multipoles. Although one could mitigate the impact on the fNL signature by adjusting the redshift range or the luminosity threshold of the tracer sample being considered, we suggest that, for future surveys probing large cosmic volumes, relativistic corrections should be forward modelled from the tracer luminosity function including its uncertainties. This will be important to quasar clustering measurements on scales $k \sim 10^{-3}\, h\, {\rm Mpc}^{-1}$ in upcoming surveys such as the Dark Energy Spectroscopic Instrument (DESI), where relativistic corrections can overwhelm the expected fNL signature at low redshifts z ≲ 1 and become comparable to fNL ≃ 1 in the power spectrum quadrupole at redshifts z ≳ 2.5.

scholarly journals Comparing approximate methods for mock catalogues and covariance matrices II: power spectrum multipoles

2019 ◽  
Vol 485 (2) ◽  
pp. 2806-2824 ◽  
Author(s):  
Linda Blot ◽  
Martin Crocce ◽  
Emiliano Sefusatti ◽  
Martha Lippich ◽  
Ariel G Sánchez ◽  
...  
Keyword(s):  
Growth Rate ◽  
Distribution Function ◽  
Power Spectrum ◽  
Probability Distribution Function ◽  
Initial Conditions ◽  
Covariance Matrices ◽  
Full Density ◽  
Model Parameters ◽  
Approximate Methods ◽  
Parameter Constraints

ABSTRACT We study the accuracy of several approximate methods for gravitational dynamics in terms of halo power spectrum multipoles and their estimated covariance matrix. We propagate the differences in covariances into parameter constraints related to growth rate of structure, Alcock–Paczynski distortions, and biasing. We consider seven methods in three broad categories: algorithms that solve for halo density evolution deterministically using Lagrangian trajectories (ICE–COLA, pinocchio, and peakpatch), methods that rely on halo assignment schemes on to dark matter overdensities calibrated with a target N-body run (halogen, patchy), and two standard assumptions about the full density probability distribution function (Gaussian and lognormal). We benchmark their performance against a set of three hundred N-body simulations, running similar sets of approximate simulations with matched initial conditions, for each method. We find that most methods reproduce the monopole to within $5{{\ \rm per\ cent}}$, while residuals for the quadrupole are sometimes larger and scale dependent. The variance of the multipoles is typically reproduced within $10{{\ \rm per\ cent}}$. Overall, we find that covariances built from approximate simulations yield errors on model parameters within $10{{\ \rm per\ cent}}$ of those from the N-body-based covariance.

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