Cerâmica Eletrônica: Grupo LIEC - UFSCar

Longo, E.; Leite, E. R.; Paskocimas, C. A.; Varela, José Arana; Zaghete, Maria Aparecida; Cilense, M.

doi:10.1590/s0366-69131999000400002

Cited by 1 publication

(1 citation statement)

References 18 publications

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“…At present, the standard cosmology confronts some challenges. Observations on the large-scale structure of the Universe, such as "great cold spot" on cosmic microwave background (CMB) sky map [8], alignment of lower multipoles in CMB power spectrum [9,10], alignment of polarization directions of quasars in large scale [11], handedness of spiral galaxies [12], and spatial variation of the fine structure constant [13,14], show that the Universe may be anisotropic.…”

Section: Introductionmentioning

confidence: 99%

Probing the isotropy of cosmic acceleration using different supernova samples

Sun

Wang

2019

Eur. Phys. J. C

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Recent studies indicated that an anisotropic cosmic expansion may exist. In this paper, we use three data sets of type Ia supernovae (SNe Ia) to probe the isotropy of cosmic acceleration. For the Union2.1 data set, the direction and magnitude of the dipole are (l = 309., and A = (4.4 ± 5.0) × 10 −4 for dipole fitting and δ = 0.56, l = 141 • , b = −11 • for hemisphere comparison. For the JLA data set, no significant dipolar or quadrupolar deviation is found. We find previous works using (l, b, A) directly as fitting parameters may get improper results. We also explore the effects of anisotropic distributions of coordinates and redshifts on the results using Monte-Carlo simulations. We find that the anisotropic distribution of coordinates can cause dipole directions and make dipole magnitude larger. Anisotropic distribution of redshifts is found to have no significant effect on dipole fitting results.

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