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Abstract: A simple speed-up cosmology model is proposed to account for the dark energypuzzle. We condense contributions from dark energy and curvature term into oneeffective parameter in order to reduce parameter degeneracies and to find anydeviation from flat concordance $\Lambda$CDM model, by considering that thediscrimination between dynamical and non-dynamical sources of cosmicacceleration as the best starting point for analyzing dark energy data setsboth at present and in future. We also combine recent Type Ia Supernova SNIa,Cosmic Microwave Background CMB and Baryon Oscillation BAO to constrainmodel parameter space. Degeneracies between model parameters are discussed byusing both degeneracy diagram and data analysis including high redshiftinformation from Gamma Ray Bursts GRBs sample. The analysis results show thatour model is consistent with cosmological observations. We try to distinct thecurvature effects from the specially scaling dark energy component asparameterized. We study the linear growth of large scale structure, and finallyshow the effective dark energy equation of state in our model and how thematter component coincidences with the dark energy numerically.

Author: Xin-He Meng, Meng Su, Zheng Wang

Source: https://arxiv.org/

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