期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 501, 期 3, 页码 3421-3426出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/staa3866
关键词
cosmological parameters; transients: supernovae
资金
- European Union (European Social Fund - ESF) through the Operational Programme 'Human Resources Development, Education and Lifelong Learning' [MIS-5000432]
- ESF through the Operational Programme 'Human Resources Development, Education and Lifelong Learning 2014-2020' [MIS 5047648]
- Centro de Excelencia Severo Ochoa Program [SEV-2016-0597]
- Ramon y Cajal program [RYC-2014-15843]
- Korea Institute for Advanced Study (KIAS) - government of Korea
- [PGC2018-094773-B-C32]
By analyzing supernovae and simulation data, we found significant fluctuations in the expansion history of the universe at low redshifts, possibly indicating behavior beyond the expectations of the concordance model.
We search for possible deviations from the expectations of the concordance Lambda CDM model in the expansion history of the Universe by analysing the Pantheon Type Ia Supernovae (SnIa) compilation along with its Monte Carlo simulations using redshift binning. We demonstrate that the redshift binned best-fitting Lambda CDM matter density parameter Omega(0m) and the best-fitting effective absolute magnitude M oscillate about their full data set best-fitting values with considerably large amplitudes. Using the full covariance matrix of the data taking into account systematic and statistical errors, we show that at the redshifts below z approximate to 0.5 such oscillations can only occur in 4 to 5 of the Monte Carlo simulations. While statistical fluctuations can be responsible for this apparent oscillation, we might have observed a hint for some behaviour beyond the expectations of the concordance model or a possible additional systematic in the data. If this apparent oscillation is not due to statistical or systematic effects, it could be due to either the presence of coherent inhomogeneities at low z or due to oscillations of a quintessence scalar field.
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