article · Physica Scripta
Understanding the accelerated expansion of the universe requires investigating the behaviour and origin of dark energy. This research reconstructs dark energy dynamics by parameterising the deceleration parameter within a Friedmann-Lemaitre-Robertson-Walker universe containing radiation, dark matter, and dark energy. The investigation explores three established parameterised models to evaluate cosmic energy density based on observational datasets, whilst also introducing a fourth parameterisation model. Cosmological parameters are estimated from observational data to determine best-fit values, which are subsequently applied to analyse cosmographic parameters. Finally, information criteria are employed to compare and assess the statistical viability of each model. Through these calculations, the research clarifies how alternative mathematical descriptions of universal acceleration align with observational evidence.
The accelerated expansion of the universe is one of the most significant open puzzles in modern physics. By testing mathematical representations against real astronomical observations, researchers can better understand the mysterious nature of dark energy. Refining these cosmological frameworks helps scientists build an increasingly accurate picture of cosmic history and the future evolution of our universe.
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Abstract Confirmation of accelerated expansion of the Universe probed the concept of dark energy theory, and since then, numerous models have been introduced to explain its origin and nature. The present work is based on reconstructing dark energy by parametrization of the deceleration parameter in the FLRW universe filled with radiation, dark matter and dark energy. We have chosen some well-motivated parametrized models 1-3 in an attempt to investigate the energy density in terms of deceleration parameters by estimating the cosmological parameters with the help of different observational datasets. Also, we have introduced a new model 4 for the parametrization of the deceleration parameter. Then we analyzed the cosmography parameters using the best-fit values of the parameters. Using the information criteria, we have examined the viability of the models.
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DOI: 10.1088/1402-4896/acea02
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