Parametrization Framework for the Deceleration Parameter in Scalar Field Dark Energy Model
Fuente:
arXiv
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| Formato: | Preprint |
| Publicado: |
2025
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| _version_ | 1866915092007747584 |
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| author | Beesham, Aroonkumar |
| author_facet | Beesham, Aroonkumar |
| contents | We propose a Friedmann-Lemaitre-Robertson-Walker cosmological model with a scalar field that represents dark energy. A new parametrization of the deceleration parameter is introduced of the form $q = 1 + η(1 + μa^η)$ where $η$ and $μ$ are model parameters. and the compatibility of the model is constrained by recent observational datasets, including cosmic chronometers, Pantheon+ and Baryon Acoustic Observations. By considering a variable deceleration parameter, we address the expansion history of the universe, providing a viable description of the transition from deceleration to acceleration. Using the Markov Chain Monte Carlo method, the parameters of the model are constrained and we examine the cosmological parameters. A comparison is then made with the $Λ$CDM model using the latest observations. We examine the history of the main cosmological parameters, such as the deceleration parameter, jerk parameter, snap parameter, density parameter, and equation-of-state parameter, by constraining and interpreting them to reveal insights into what has been dubbed "dynamical dark energy" under the assumptions made above. Our method provides a framework that is independent of the model to explore dark energy, leading to a deeper and more subtle understanding of the mechanisms driving late-time cosmic acceleration. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2501_02592 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Parametrization Framework for the Deceleration Parameter in Scalar Field Dark Energy Model Beesham, Aroonkumar Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology High Energy Physics - Theory 83F05, 85A40 We propose a Friedmann-Lemaitre-Robertson-Walker cosmological model with a scalar field that represents dark energy. A new parametrization of the deceleration parameter is introduced of the form $q = 1 + η(1 + μa^η)$ where $η$ and $μ$ are model parameters. and the compatibility of the model is constrained by recent observational datasets, including cosmic chronometers, Pantheon+ and Baryon Acoustic Observations. By considering a variable deceleration parameter, we address the expansion history of the universe, providing a viable description of the transition from deceleration to acceleration. Using the Markov Chain Monte Carlo method, the parameters of the model are constrained and we examine the cosmological parameters. A comparison is then made with the $Λ$CDM model using the latest observations. We examine the history of the main cosmological parameters, such as the deceleration parameter, jerk parameter, snap parameter, density parameter, and equation-of-state parameter, by constraining and interpreting them to reveal insights into what has been dubbed "dynamical dark energy" under the assumptions made above. Our method provides a framework that is independent of the model to explore dark energy, leading to a deeper and more subtle understanding of the mechanisms driving late-time cosmic acceleration. |
| title | Parametrization Framework for the Deceleration Parameter in Scalar Field Dark Energy Model |
| topic | Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology High Energy Physics - Theory 83F05, 85A40 |
| url | https://arxiv.org/abs/2501.02592 |