Cosmological constraints on dark energy in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si14.svg" display="inline" id="d1e595"><mml:mrow><mml:mi>f</mml:mi><mml:mrow><mml:mo>(</mml:mo><mml:mi>Q</mml:mi><mml:mo>)</mml:mo></mml:mrow></mml:mrow></mml:math> gravity: A parametrized perspective

Mussatayeva, A.; Myrzakulov, N.; Koussour, M.

doi:10.1016/j.dark.2023.101276

Cited by 19 publications

(1 citation statement)

References 53 publications

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“…The choice of the specific parametric form emerges from a synthesis of theoretical considerations and empirical insights. This form aligns with the standard cosmological model and adeptly captures the evolution of the EoS parameter across varying cosmic epochs [43]. The selection of this form allows us to depict the cosmic landscape as it transitions from DE domination to matter and radiation domination, providing an inclusive framework for comprehensive analysis.…”

Section: Cosmological Modelmentioning

confidence: 81%

Constraining the cosmological model using recent observational data*

Myrzakulov,

Koussour,

Alfedeel

et al. 2023

Chinese Phys. C

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In this paper, we consider a comprehensive investigation of the cosmological model described by $f(R,T) = R + 2\lambda T$ (where $\lambda$ represents a free parameter) in light of the most recent observational data. By constraining the model using $Hubble$ and $Pantheon$ datasets, we determine its compatibility with the observed behavior of the Universe. For this purpose, we adopt a parametric form for the effective equation of state (EoS) parameter. This parametric form allows us to describe the evolution of the EoS parameter with respect to redshift and investigate its behavior during different cosmic epochs. The analysis of the deceleration parameter reveals an accelerating Universe with a present value of $q_0=-0.64^{+0.03}_{-0.03}$, indicating the current phase of accelerated expansion. The transition redshift is found to be $z_{tr}=0.53^{+0.04}_{-0.03}$, marking the epoch of transition from deceleration to acceleration. We also analyze the evolution of important cosmological parameters including density parameter, pressure, effective EoS, and stability. \textbf{These findings collectively demonstrate the viability of the $f(R,T)$ cosmological model as a robust candidate capable of engendering the requisite negative pressure, thereby efficiently propelling cosmic expansion. Moreover, the undertaken stability analysis underscores the model's stability within the broader cosmic landscape. By providing the best-fit values for the coupling parameter $\lambda$, this approach motivates and encourages further explorations into the extensive landscape of this model and its potential applications across diverse realms of cosmology and astronomy.

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Section: Cosmological Modelmentioning

confidence: 81%