Nonparametric Dark Energy Reconstruction Using the Tomographic Alcock–Paczynski Test

Zhang, Zhenyu; Gu, Gan; Wang, Xiaoma; Li, Yunhe; Sabiu, Cristiano G.; Park, Hyunbae; Miao, Haitao; Luo, Xiaolin; Fang, F.; Li, Xiao Dong

doi:10.3847/1538-4357/ab1ea4

Cited by 24 publications

(13 citation statements)

References 53 publications

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“…RSD and nonlinear corrections for models far beyond the concordance ΛCDM can be very non-trivial. We leave the PAge exploration of BAO, as well as of many other potential probes (Wei et al 2017;Zheng et al 2019;Zhang et al 2019;Wong et al 2019;Shajib et al 2019), as our future work.…”

Section: Discussionmentioning

confidence: 99%

Supernova Magnitude Evolution and PAge Approximation

Huang

2020

ApJL

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The evidence of environmental dependence of Type Ia supernova luminosity has inspired recent discussion about whether the late-universe cosmic acceleration is still supported by supernova data. We adopt the ∆HR/∆age parameter, which describes the dependence of supernova absolute magnitude on the age of supernova progenitor, as an additional nuisance parameter. Using the Pantheon supernova data, a lower bound ≥ 12 Gyr on the cosmic age, and a Gaussian prior H 0 = 70 ± 2 km s −1 Mpc −1 on the Hubble constant, we reconstruct the cosmic expansion history. Within the flat Λ cold dark matter (ΛCDM) framework, we still find a 5.6σ detection of cosmic acceleration. This is because a matter dominated decelerating universe would be too young to accommodate observed old stars with age 12 Gyr. A decelerating but non-flat universe is marginally consistent with the data, however, only in the presence of a negative spatial curvature ∼ two orders of magnitude beyond the current constraint from cosmic microwave background data. Finally, we propose a more general Parameterization based on the cosmic Age (PAge), which is not directly tied to the dark energy concept and hence is ideal for a null test of the cosmic acceleration. We find that, for a magnitude evolution rate ∆HR/∆age 0.3 mag/5.3 Gyr (Kang et al. 2020), a spatially flat and decelerating PAge universe is fully consistent with the supernova data and the cosmic age bound, and has no tension with the geometric constraint from the observed CMB acoustic angular scales.

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Section: Discussionmentioning

confidence: 99%

Supernova Magnitude Evolution and PAge Approximation

Huang

2020

ApJL

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“…The presence of shot noise fundamentally restricts our ability to reconstruct the density field from the galaxy point distribution, as we must smooth on scales of at least the mean galaxy separation Kim et al (2014); Blake et al (2014); Appleby et al (2017). In contrast, methods such as the Alcock-Paczynski (AP) test Li et al (2016) (see also Li et al (2017); Zhang et al (2019a); Li et al (2018); Park et al (2019); Zhang et al (2019b)) employ information from very small scales, eliminating non-perturbative, non-linear systematics using simulations. In addition, the AP test does not require the application of mass cuts to generate uniform data samples with redshift, as we are forced to.…”

Section: Discussionmentioning

confidence: 99%

Cosmological Parameter Estimation from the Two-dimensional Genus Topology: Measuring the Shape of the Matter Power Spectrum

Appleby

Park

Hong

et al. 2020

ApJ

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We measure the genus of the galaxy distribution in two-dimensional slices of the SDSS-III BOSS catalog to constrain the cosmological parameters governing the expansion history of the Universe. The BOSS catalogs are divided into twelve concentric shells over the redshift range 0.25 < z < 0.6 and we repeatedly measure the genus from the two-dimensional galaxy density fields, each time varying the cosmological parameters used to infer the distance-redshift relation to the shells. We also indirectly reconstruct the two-dimensional genus amplitude using the three-dimensional genus measured from SDSS Main Galaxy Sample with galaxies at low redshift z < 0.12. We combine the low-and highredshift measurements, finding the cosmological model which minimizes the redshift evolution of the genus amplitude, using the fact that this quantity should be conserved. Being a distance measure, the test is sensitive to the matter density parameter (Ω m) and equation of state of dark energy (w de). We find a constraint of w de = −1.05 +0.13 −0.12 , Ω m = 0.303 ± 0.036 after combining the high-and low-redshift measurements and combining with Planck CMB data. Higher redshift data and combining data sets at low redshift will allow for stronger constraints.

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“…In comparison, H 0 measurements from the time delay of strongly lensed quasars support a higher value (Birrer et al 2019;Wong et al 2019); using differential age method with cosmic chronometers (Jimenez & Loeb 2002) provides an estimate in the middle of two results in tension (Jimenez et al 2019;Chen et al 2017;Luković et al 2016); while the constraints coming from gravitational waves are still fairly weak (Liao et al 2017). Although the quality of BAO data has substantially improved over the last decade, providing some of the most stringent cosmological constraints on expansion dynamics (Haridasu et al 2018a;Ramanah et al 2019;Zhang et al 2019), their H 0 estimate is degenerated with the sound horizon parameter, whose value relies on CMB obser-vations and early Universe physics (Macaulay et al 2019;Lemos et al 2019;Aubourg et al 2015;Cuceu et al 2019).…”

Section: Introductionmentioning

confidence: 90%

Exploring the evidence for a large local void with supernovae Ia data

Luković

Haridasu

Vittorio

2019

Monthly Notices of the Royal Astronomical Society

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In the present work we utilise the most recent publicly available SN Ia compilations and implement a well formulated cosmological model based on LTB metric in presence of cosmological constant Λ (ΛLTB) to test for signatures of large local inhomogeneities at z ≤ 0.15. Local underdensities in this redshift range have been previously found based on luminosity density data and galaxy number counts. Our main constraints on the possible local void using the Pantheon SN Ia dataset are -redshift size of z size = 0.068 +0.021 −0.030 and density contrast of δΩ 0 /Ω 0 = −10.5 +9.3 −7.4 % in 68% confidence intervals. Investigating the possibility to alleviate the tension between the measurements of present expansion rate H 0 , coming from calibrated local SN Ia and high-z CMB data, we confirm previous findings that large local void alone is a very unlikely explanation for the ∼ 9% disagreement between the two estimates. However, constraints from our SN Ia analysis inside 1σ confidence regions of z size − δΩ 0 /Ω 0 plane allow a void of e.g. z size = 0.075 (320 h 70 −1 Mpc) and δΩ 0 /Ω 0 = −20%. Fitting Pantheon SN Ia from 0.023 < z < 0.15 range, we find a 1.1% shift towards lower H 0 value for ΛLTB model compared to model-independent method with Taylor expanded distance formula. Analysing luminosity density data with ΛLTB model yields constraint on contrast of large isotropic void δΩ 0 /Ω 0 = −51.9 ± 6.3%, which is in ∼ 4σ tension with SN Ia results. More data is necessary to better constrain the local matter density profile and understand the disagreement between SN Ia and luminosity density samples.

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Nonparametric Dark Energy Reconstruction Using the Tomographic Alcock–Paczynski Test

Cited by 24 publications

References 53 publications

Supernova Magnitude Evolution and PAge Approximation

Supernova Magnitude Evolution and PAge Approximation

Cosmological Parameter Estimation from the Two-dimensional Genus Topology: Measuring the Shape of the Matter Power Spectrum

Exploring the evidence for a large local void with supernovae Ia data

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