A tomographic test of cosmological principle using the JLA compilation of type Ia supernovae

Chang, Zhe; Lin, Hai-Nan; Sang, Yu; Wang, Sai

doi:10.1093/mnras/sty1120

Cited by 19 publications

(11 citation statements)

References 86 publications

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“…A similar cosmic anisotropy has been found in the Union2.1 sample (Yang et al 2014;Javanmardi et al 2015;Bengaly et al 2015;Li et al 2015;Lin et al 2016b). Different with the Union2 or Union2.1 sample, the JLA sample doesn't show any convincing evidence for the existence of the cosmic anisotropy (Bengaly et al 2015;Lin et al 2016a;Chang et al 2018a;Wang & Wang 2018;Deng & Wei 2018b;Sun & Wang 2018a). Constraining the anisotropic amplitude and direction in ΛCDM, ωCDM and CPL models with the JLA sample gave a zero result (Lin et al 2016a).…”

Section: Introductionmentioning

confidence: 51%

“…Constraining the anisotropic amplitude and direction in ΛCDM, ωCDM and CPL models with the JLA sample gave a zero result (Lin et al 2016a). No significant deviation from the isotropic universe was found through a redshift tomographic analysis on the JLA sample in the dipole-modulated ΛCDM model (Chang et al 2018a). Constrained by the JLA sample, an anisotropic universe model with Bianchi-I metric was found to be consistent with the isotropic universe (Wang & Wang 2018).…”

Section: Introductionmentioning

confidence: 80%

“…As standard candles, the supernovae of type Ia (SNe Ia) have been used to investigate the accelerating expansion of the Universe (Riess et al 1998;Perlmutter et al 1999), and the possible deviations from the isotropic universe ( Heneka et al 2014;Bengaly et al 2015;Li et al 2015;Javanmardi et al 2015;Lin et al 2016a,b;Salehi & Aftabi 2016;Salehi & Setare 2017;Li & Lin 2017;Ghodsi et al 2017;Wang & Wang 2018;Andrade et al 2018b;Chang et al 2018a;Deng & Wei 2018b), with the datasets given by the Union2 sample (Amanullah et al 2010), the Union2.1 sample (Suzuki et al 2012) and the "Joint Lightcurve Analysis" (JLA) sample (Betoule et al 2014). Antoniou & Perivolaropoulos (2010) first used the hemisphere comparison (HC) method to the Union2 sample and they found a certain cosmological preferred direction with maximum accelerating expansion rate.…”

Section: Introductionmentioning

confidence: 99%

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Anisotropy of the Universe via the Pantheon supernovae sample revisited

Zhao

Zhou

Chang

2019

Monthly Notices of the Royal Astronomical Society

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We employ the hemisphere comparison (HC) method and the dipole fitting (DF) method to investigate the cosmic anisotropy in the recently released Pantheon sample of type Ia supernovae (SNe Ia) and five combinations among Pantheon. For the HC method, we find the maximum anisotropy level in the full Pantheon sample is AL max = 0.361 ± 0.070 and corresponding direction (l, b) = (123.05A robust check shows the statistical significance of maximum anisotropy level is about 2.1σ. We also find that the Low-z and SNLS subsamples have decisive impact on the overall anisotropy while other three subsamples have little impact. Moreover, the anisotropy level map significantly rely on the inhomogeneous distribution of SNe Ia in the sky. For the DF method, we find the dipole anisotropy in the Pantheon sample is very weak. The dipole magnitude is constrained to be less than 1.16 × 10 −3 at 95% confidence level. However, the dipole direction is well inferred by MCMC method and it points towards (l, b) = (306.00 •+82.95 • −125.01 • , −34.20 •+16.82 • −54.93 • ). This direction is very close to the axial direction to the plane of SDSS subsample. It may imply that SDSS subsample is the decisive part to the dipole anisotropy in the full Pantheon sample. All these facts imply that the cosmic anisotropy found in Pantheon sample significantly rely on the inhomogeneous distribution of SNe Ia in the sky. More homogeneous distribution of SNe Ia is necessary to search for a more convincing cosmic anisotropy.

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Section: Introductionmentioning

confidence: 51%

Section: Introductionmentioning

confidence: 80%

Section: Introductionmentioning

confidence: 99%

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Anisotropy of the Universe via the Pantheon supernovae sample revisited

Zhao

Zhou

Chang

2019

Monthly Notices of the Royal Astronomical Society

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“…Zhao et al found a dipole of cosmic acceleration at more than 2σ level with the Union2 sample [100]. Unlike the Union2&2.1 sample, there is no anisotropic signal in the JLA sample [101][102][103] and Pantheon sample [104][105][106]. Zhao and Zhou et al [107] found that the SDSS 0123456789().…”

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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“…After that, Mariano and Perivolaropoulos (Mariano & Perivolaropoulos 2012) found a possible preferred anisotropic direction at the 2σ level using the Union2 sample, but by employing the dipole fitting (DF) method. Since then, these two methods have been widely used to explore the cosmic anisotropy (Cai & Tuo 2012;Cai et al 2013;Zhao et al 2013;Li et al 2013;Heneka et al 2014;Bengaly et al 2015;Andrade et al 2018;Sun & Wang 2019) by investigating observational data of, for instance, the Union2.1 sample (Yang et al 2014;Javanmardi et al 2015;Lin et al 2016a), the Joint Light-Curve Analysis (JLA) sample (Lin et al 2016b;Chang et al 2018a;, the Pantheon sample (Sun & Wang 2018), gamma-ray bursts (GRBs; Wang & Wang 2014), galaxies (Zhou et al 2017), as well as gravitational wave and fast radio bursts (Qiang et al 2019;Cai et al 2019). Using HC and DF methods, Zhao et al (2019) studied the cosmic anisotropy via the Pantheon sample.…”

Section: Introductionmentioning

confidence: 99%

Testing cosmic anisotropy with Pantheon sample and quasars at high redshifts

Wang

2020

A&A

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In this paper, we investigate the cosmic anisotropy from the SN-Q sample, consisting of the Pantheon sample and quasars, by employing the hemisphere comparison (HC) method and the dipole fitting (DF) method. Compared to the Pantheon sample, the new sample has a larger redshift range, a more homogeneous distribution, and a larger sample size. For the HC method, we find that the maximum anisotropy level is ALmax = 0.142 ± 0.026 in the direction (l, b) = (316.08°−129.48+27.41, 4.53°−64.06+26.29). The magnitude of anisotropy is A = (−8.46−5.51+4.34) × 10−4 and the corresponding preferred direction points toward (l, b) = (29.31°−30.54+30.59, 71.40°−9.72+9.79) for the quasar sample from the DF method. The combined SN and quasar sample is consistent with the isotropy hypothesis. The distribution of the dataset might impact the preferred direction from the dipole results. The result is weakly dependent on the redshift from the redshift tomography analysis. There is no evidence of cosmic anisotropy in the SN-Q sample. Though some results obtained from the quasar sample are not consistent with the standard cosmological model, we still do not find any distinct evidence of cosmic anisotropy in the SN-Q sample.

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A tomographic test of cosmological principle using the JLA compilation of type Ia supernovae

Cited by 19 publications

References 86 publications

Anisotropy of the Universe via the Pantheon supernovae sample revisited

Anisotropy of the Universe via the Pantheon supernovae sample revisited

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

Testing cosmic anisotropy with Pantheon sample and quasars at high redshifts

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