Abstract
In this paper, we have given some analysis from observations of type Ia supernovae (SNIa). We find that the average total observational error of SNIa is obviously greater than 0.55m. On the other hand, a popular view of circumstantial evidence for the accelerating universe comes from the comparison of theoretical models simulating the accelerating expansion of the universe with observations from the Wilkinson Microwave Anisotropy Probe (WMAP) satellite deviating from the observed isotropic temperature of the Cosmic Microwave Background (CMB). Due to the fact that the velocity space is not isotropic, then the theoretical simulations are incredibly consistent with observations from the WMAP and Planck satellites. We conclude that the anisotropy of the velocity space will inevitably lead to an anisotropic distribution of the CMB temperature, and the above indirect evidence of the cosmic acceleration is inadequate and inappropriate.
Highlights
Where D is the distance in the unit of pc, m and M are the apparent magnitude and absolute magnitude of SNIa, respectively
We find that the average total observational error of SNIa is obviously greater than 0.55m
A popular view of circumstantial evidence for the accelerating universe comes from the comparison of theoretical models simulating the accelerating expansion of the universe with observations from the Wilkinson Microwave Anisotropy Probe (WMAP) satellite deviating from the observed isotropic temperature of the Cosmic Microwave Background (CMB)
Summary
Accelerating expansion of the universe may be caused by dark energy, which is one of the most important ideas of researches in astrophysics and cosmology today. According to the data from 685 SNIa, which is from the SALT2, UNION2 [6], the system error of the absolute magnitudes of SNIa was found by minimizing χ2, which is the normalized quadratic sum of distance modulus residual [6] As a result, they came to a conclusion that the expansion of the universe that began with the Big Bang is speeding up. For the population age effect, which would inevitably cause a serious systematic bias with look-back time, the light-curve fitters used by the SNe Ia community may be not capable of correcting They suggested that we must consider the systematic bias in SN cosmology for studying the dark energy [9]. These results show that the universe may be not accelerating expansion
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