期刊
ASTROPHYSICAL JOURNAL
卷 874, 期 1, 页码 -出版社
IOP Publishing Ltd
DOI: 10.3847/1538-4357/ab0898
关键词
cosmic background radiation; cosmological parameters; distance scale; galaxies: structure
资金
- NSF [OPP-1248097]
- NSF REU program at UC Davis [PHY-1560482]
- Australian Research Council [DP150103208]
- Kavli Institute for Cosmological Physics at the University of Chicago through Kavli Foundation
Type Ia supernovae, calibrated by classical distance ladder methods, can be used, in conjunction with galaxy survey two-point correlation functions, to empirically determine the size of the sound horizon r(s). Assumption of the Lambda CDM model, together with data to constrain its parameters, can also be used to determine the size of the sound horizon. Using a variety of cosmic microwave background (CMB) data sets to constrain Lambda CDM parameters, we find the model-based sound horizon to be larger than the empirically determined one with a statistical significance of between 2 sigma and 3 sigma, depending on the data set. If reconciliation requires a change to the cosmological model, we argue that change is likely to be important in the two decades of scale factor evolution prior to recombination. Future CMB observations will therefore likely be able to test any such adjustments; e.g., a third-generation CMB survey like SPT-3G can achieve a threefold improvement in the constraints on r(s) in the Lambda CDM model extended to allow additional light degrees of freedom.
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