Inevitable manifestation of wiggles in the expansion of the late Universe

被引:15
作者
Akarsu, Ozgur [1 ]
Colgain, Eoin O. [2 ,3 ,4 ]
Ozulker, Emre [1 ]
Thakur, Somyadip [3 ,4 ]
Yin, Lu [3 ,4 ,5 ]
机构
[1] Istanbul Tech Univ, Dept Phys, TR-34469 Istanbul, Turkiye
[2] Atlantic Technol Univ, Ash Lane, Sligo, Ireland
[3] Sogang Univ, Ctr Quantum Spacetime, Seoul 121742, South Korea
[4] Sogang Univ, Dept Phys, Seoul 121742, South Korea
[5] Asia Pacific Ctr Theoret Phys, Pohang 37673, South Korea
基金
新加坡国家研究基金会;
关键词
COSMOLOGICAL CONSTANT; DARK-ENERGY; LAMBDA; MODEL; CONSTRAINTS; WAVELETS; H-0;
D O I
10.1103/PhysRevD.107.123526
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
Using the fact that the comoving angular diameter distance to the last scattering surface is strictly constrained almost model independently, we show that, for any model agreeing with the standard.CDM model on its background dynamics at z similar to 0 and size of the comoving sound horizon at last scattering, the deviations of the Hubble radius from the one of the standard Lambda CDM model must be a member of the set of admissible wavelets. The family of models characterized by this framework also offers nontrivial oscillatory behaviors in various functions that define the kinematics of the Universe, even when the wavelets themselves are very simple. We also discuss the consequences of attributing these kinematics to, first, dark energy, and second, varying gravitational coupling strength. Utilizing some simplest wavelets, we demonstrate the competence of this framework in describing the baryon acoustic oscillation (BAO) data without any modifications to the agreement with cosmic microwave background measurements. This framework also provides a natural explanation for the bumps found in nonparametric observational reconstructions of the Hubble parameter and dark energy density as compensations of the dips suggested by some BAO data, and questions the physical reality of their existence. We note that utilizing this framework on top of the models that agree with both the cosmic microwave background and local H-0 measurements but are held back by BAO data, one may resurrect these models through the wiggly nature of wavelets that can naturally accommodate the BAO data. Finally, we also suggest narrowing the plausible set of admissible wavelets to further improve our framework by imposing conditions from expected kinematics of a viable cosmological model or first principle fundamental physics such as energy conditions.
引用
收藏
页数:16
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