Analysis of cosmic evolution admitting Garcia-Salcedo ghost and generalized ghost dark energy models

Gul, M. Zeeshan; Sharif, M.; Hashim, I.

doi:10.1016/j.dark.2024.101537

Physics of the Dark Universe

2024

DOI: 10.1016/j.dark.2024.101537

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Analysis of cosmic evolution admitting Garcia-Salcedo ghost and generalized ghost dark energy models

M. Zeeshan Gul,

M. Sharif,

I. Hashim

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2024

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Cited by 3 publications

References 54 publications

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Cosmic evolution of Tsallis holographic dark energy model in f(R,T2) gravity

Sharif,

Gul,

Hashim

2024

Physics of the Dark Universe

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Cosmic evolution of Tsallis holographic dark energy model in f(R,T2) gravity

Sharif,

Gul,

Hashim

2024

Physics of the Dark Universe

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Stability analysis of charged neutron stars and Darmois junction conditions

Gul,

Sharif,

Arooj

et al. 2024

Eur. Phys. J. C

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This research article examines the impact of $$f({\mathcal {Q}},{\mathcal {T}})$$ f ( Q , T ) theory on the geometry of charged neutron stars filled with anisotropic matter configuration. Here, $${\mathcal {Q}}$$ Q represents non-metricity and $${\mathcal {T}}$$ T denotes the trace of energy-momentum tensor. We use a particular functional form of this modified theory to reduce the system’s complexity and derive explicit relations of the energy density and pressure components. Further, we consider viable non-singular solutions to analyze the internal structure of the charged neutron stars. The unspecified parameters in the metric coefficients are evaluated through Darmois junction conditions, which ensures consistency between interior and exterior solutions of the stellar objects. These parameters are then used to explore different physical characteristics such as the behavior of energy density, pressure components, anisotropy, energy bounds, equation of state parameter, compactness and redshift function in the interior of charged neutron stars. The stability and equilibrium states of the charged stellar objects are discussed using the Tolman–Oppenheimer–Volkoff equation and the speed of sound, respectively. Our results suggest that the charged neutron stars are viable and stable in the presence of dark source terms.

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Comprehensive study of bouncing cosmological models in f(Q, T) theory

Gul,

Sharif,

Shabbir

2024

Eur. Phys. J. C

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The main objective of this article is to investigate the viability of bouncing cosmological scenarios using different forms of scale factors with perfect matter configuration in the framework of extended symmetric teleparallel theory. This modified proposal is defined by the function f(Q, T), where Q characterizes non-metricity and T denotes the trace of energy-momentum tensor. We investigate the modified field equations of this theory using different parametric values of the Hubble parameter and non-metricity to derive viable solutions. These solutions are relevant in various cosmological bounce models such as symmetric-bounce, super-bounce, oscillatory-bounce, matter-bounce and exponential-bounce models. Furthermore, we examine the behavior of energy density and pressure to analyze the characteristics of dark energy. A comprehensive analysis is also conducted to explore the behavior of the equation of state parameter and deceleration parameter to examine the evolutionary eras of the cosmos. Our findings show that the f(Q, T) gravity describes the cosmic expansion in the vicinity of the bouncing point during the early and late times of cosmic evolution.

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Analysis of cosmic evolution admitting Garcia-Salcedo ghost and generalized ghost dark energy models

Cited by 3 publications

References 54 publications

Cosmic evolution of Tsallis holographic dark energy model in f(R,T2) gravity

Cosmic evolution of Tsallis holographic dark energy model in f(R,T2) gravity

Stability analysis of charged neutron stars and Darmois junction conditions

Comprehensive study of bouncing cosmological models in f(Q, T) theory

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