Probing the isotropy of cosmic acceleration using different supernova samples

Sun, Zu-Yao; Wang, F. Y.

doi:10.1140/epjc/s10052-019-7293-3

Cited by 18 publications

(8 citation statements)

References 73 publications

(78 reference statements)

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“…In recent years, SNe Ia sample, i.e., the Union2&2.1 sample [88,89], Joint Light-Curve Analysis (JLA) sample [90], and Pantheon sample [91] are widely used to test the anisotropy of the Universe. Certain preferred directions were found by the hemisphere comparison (HC) method with the Union2&2.1 sample [15][16][17][92][93][94][95][96][97][98]. The CDM model is barely consistent with the SNe Ia data at the redshift range z < 0.5 in the Union2 sample [99].…”

Section: Introductionmentioning

confidence: 99%

A tomographic test of cosmic anisotropy with the recently-released quasar sample

Zhao

Xia

2021

Eur. Phys. J. C

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We test the cosmic anisotropy in the dipole-modulated $$\Lambda $$ Λ CDM model and Finslerian cosmological model with the recently-released quasar sample. Based on the redshift tomographic method, the quasar sample is divided into two subsets $$z \le z_{cut}$$ z ≤ z cut and $$z > z_{cut}$$ z > z cut by different cutting redshifts. The dipole amplitudes of the two cosmological models from the subsets $$z \le z_{cut}$$ z ≤ z cut are very weak. We find that quasars at a higher redshift range may provide more detailed information about the dipole amplitude $$A_D$$ A D . The dipole directions of each cosmological model from the subsets $$z \le 1.1$$ z ≤ 1.1 and $$z > 1.1$$ z > 1.1 are deviated by $$1\sigma $$ 1 σ level. The Pantheon sample is combined with the two subsets. The dipole amplitude from the two combined datasets is also very weak. In the dipole-modulated $$\Lambda $$ Λ CDM model, the dipole direction from the combined dataset quasar at $$z \le 1.1$$ z ≤ 1.1 and Pantheon sample is far away from the one given by the Pantheon sample. In the Finslerian cosmological model, the dipole directions from the two combined datasets are close to the one in the Pantheon sample.

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Section: Introductionmentioning

confidence: 99%

A tomographic test of cosmic anisotropy with the recently-released quasar sample

Zhao

Xia

2021

Eur. Phys. J. C

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“…Other null results of anisotropic expansion include Heneka et al (2014) and Lin et al (2016a), who investigated the Joint Light-curve Analysis (JLA) compilation (Betoule et al 2014) of 740 SNIa. (See also Sun & Wang (2019), who obtain discrepant results from three different compilations of SNIa namely Union 2.1, JLA and Constitution.) An important distinction between these data sets is that Union2/2.1 and Constitution have no corrections for the peculiar velocities of the SNe host galaxies, whereas JLA does.…”

Section: Introductionmentioning

confidence: 99%

New Constraints on Anisotropic Expansion from Supernovae Type Ia

Rahman,

Trotta,

Boruah

et al. 2021

Preprint

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We re-examine the contentious question of constraints on anisotropic expansion from Type Ia supernovae (SNIa) in the light of a novel determination of peculiar velocities, which are crucial to test isotropy with SNe out to distances ∼ < 200/ℎ Mpc. We re-analyze the Joint Light-Curve Analysis (JLA) Supernovae (SNe) data, improving on previous treatments of peculiar velocity corrections and their uncertainties (both statistical and systematic) by adopting state-of-the-art flow models constrained independently via the 2M++ galaxy redshift compilation. We also introduce a novel procedure to account for colour-based selection effects, and adjust the redshift of low-𝑧 SNe self-consistently in the light of our improved peculiar velocity model.We adopt the Bayesian hierarchical model BAHAMAS to constrain a dipole in the distance modulus in the context of the ΛCDM model and the deceleration parameter in a phenomenological Cosmographic expansion. We do not find any evidence for anisotropic expansion, and place a tight upper bound on the amplitude of a dipole, |𝐷 𝜇 |< 5.93 × 10 −4 (95% credible interval) in a ΛCDM setting, and |𝐷 𝑞 0 |< 6.29 × 10 −2 in the Cosmographic expansion approach. Using Bayesian model comparison, we obtain posterior odds in excess of 900:1 (640:1) against a constant-in-redshift dipole for ΛCDM (the Cosmographic expansion). In the isotropic case, an accelerating universe is favoured with odds of ∼ 1100 : 1 with respect to a decelerating one.

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“…Such an anisotropy could also manifest itself as an anisotropy of cosmological parameters entering H(z) like the matter density parameter Ω 0m . Despite intense efforts to identify such anisotropy in the latest SnIa data (the Pantheon compilation [82][83][84][85][86] and the joint light-curve analysis of the SDSS-II and SNLS supernova samples data (JLA) [87][88][89]) no such anisotropy has been identified at a statistically significant level [82][83][84][85][86][87][88][89]. However, we stress that none of these analyses has attempted to identify anisotropy signals using the parameter M (or equivalently the parameters H 0 and/or M ).…”

Section: Introductionmentioning

confidence: 99%

Hints of a Local Matter Underdensity or Modified Gravity in the Low $z$ Pantheon data

Kazantzidis,

Perivolaropoulos

2020

Preprint

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Probing the isotropy of cosmic acceleration using different supernova samples

Cited by 18 publications

References 73 publications

A tomographic test of cosmic anisotropy with the recently-released quasar sample

A tomographic test of cosmic anisotropy with the recently-released quasar sample

New Constraints on Anisotropic Expansion from Supernovae Type Ia

Hints of a Local Matter Underdensity or Modified Gravity in the Low $z$ Pantheon data

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