article · Fortschritte der Physik
Cosmological models seek to explain the accelerating expansion of the universe driven by dark energy. A flat Friedmann-Robertson-Walker universe filled with radiation, dark matter, and dark energy is examined by reconstructing a dark energy model from a specific deceleration parameter. Observational datasets, including measurements from Supernovae, Hubble parameters, Gamma Ray Bursts, Quasars, and Baryon Acoustic Oscillations, serve to constrain the free parameters of the system. The reconstructed model receives strong statistical support from these observational datasets when evaluated against the standard Lambda-CDM framework. Furthermore, cosmographic testing demonstrates that the model exhibits behaviour very similar to Lambda-CDM. Finally, diagnostic evaluations indicate that the proposed dark energy model displays quintessence-type characteristics during late-time cosmic evolution.
Determining the nature of dark energy is essential for understanding the history and fate of the universe. By constraining alternative mathematical models against diverse astronomical datasets, researchers can establish whether non-standard formulations are viable. This work shows that a reconstructed deceleration parameter matches observational benchmarks effectively, providing astrophysicists with a valid alternative to standard cosmological models.
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Abstract In the current paper, a dark energy (DE) model reconstructed from the well‐motivated deceleration parameter (DP) is analyzed. A flat FRW Universe filled with radiation, dark matter (DM), and dark energy fluids is considered. The free parameters are constrained using measurements from Supernovae, Hubble, Gamma Ray Bursts, Quasars, and Baryon acoustic Oscillations. The model under study is found to be very supported by observation with respect to ΛCDM since . Besides, a cosmographic analysis is performed showing that the reconstructed model behaves similarly as ΛCDM does. Finally, a diagnostic analysis is performed reporting that the studied model behaves quintessence type at a late time.
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DOI: 10.1002/prop.202300033
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