The impact of the non-coincidence gauge on the dark energy dynamics in f(Q)-gravity

Paliathanasis, Andronikos

doi:10.1007/s10714-023-03179-4

Gen Relativ Gravit

2023

DOI: 10.1007/s10714-023-03179-4

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The impact of the non-coincidence gauge on the dark energy dynamics in f(Q)-gravity

Andronikos Paliathanasis

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2024

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Cited by 3 publications

References 47 publications

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Power Law f(Q)$f(Q)$ Cosmology with Bulk Viscous Fluid

Rana,

Solanki,

Sahoo

2024

Annalen der Physik

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In this work, a power law model is explored, specifically, , along with viscous matter fluid having transport coefficient . The corresponding analytical solution is derived and then confronted with recent cosmic data. The Markov Chain Monte Carlo (MCMC) sampling technique is utilized to estimate the mean value of arbitrary parameters, by incorporating Cosmic Chronometers and recently published Pantheon+Analysis samples. In addition, some cosmological parameters are reconstructed by resampling the chains obtained by emcee, incorporating 6000 samples. It is found that the matter‐energy density depicts the expected positive behavior, whereas the effective pressure indicates the negative behavior that is leading the accelerating expansion, which is further predicted in the effective EoS parameter. Further, the asymptotic nature of the assumed model is investigated by invoking phase‐space analysis. It is concluded that the assumed viscous model successfully predicts an evolution of the universe from decelerated epoch to stable accelerated de‐Sitter epoch.

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Power Law f(Q)$f(Q)$ Cosmology with Bulk Viscous Fluid

Rana,

Solanki,

Sahoo

2024

Annalen der Physik

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Phase-space analysis in non-minimal symmetric-teleparallel dark energy

Carloni,

Luongo

2024

Eur. Phys. J. C

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We modify the symmetric-teleparallel dark energy through the addition of a further Yukawa-like term, in which the non-metricity scalar, Q, is non-minimally coupled to a scalar field Lagrangian where the phion acts as quintessence, describing dark energy. We investigate regions of stability and find late-time attractors. To do so, we conduct a stability analysis for different types of physical potentials describing dark energy, namely the power-law, inverse power-law, and exponential potentials. Within these choices, we furthermore single out particular limiting cases, such as the constant, linear and inverse potentials. For all the considered scenarios, regions of stability are calculated in terms of the signs of the coupling constant and the exponent, revealing a clear degeneracy among coefficients necessary to ensure stability. We find that a generic power-law potential with $$\alpha > 0$$ α > 0 is not suitable as a non-minimal quintessence potential and we put severe limits on the use of inverse potential, as well. In addition, the equations of state of each potential have been also computed. We find the constant potential seems to be favored than other treatments, since the critical point appears independent of the non-minimal coupling.

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Semi-Classical Limit and Quantum Corrections in Non-Coincidence Power-Law f(Q)-Cosmology

Paliathanasis

2024

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Within the framework of symmetric teleparallel fQ-gravity, using a connection defined in the non-coincidence gauge, we derive the Wheeler–DeWitt equation of quantum cosmology. The gravitational field equation in fQ-gravity permits a minisuperspace description, rendering the Wheeler–DeWitt equation a single inhomogeneous partial differential equation. We use the power-law fQ=f0Qμ model, and with the application of linear quantum observables, we calculate the wave function of the universe. Finally, we investigate the effects of the quantum correction terms in the semi-classical limit.

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The impact of the non-coincidence gauge on the dark energy dynamics in f(Q)-gravity

Cited by 3 publications

References 47 publications

Power Law f(Q)$f(Q)$ Cosmology with Bulk Viscous Fluid

Power Law f(Q)$f(Q)$ Cosmology with Bulk Viscous Fluid

Phase-space analysis in non-minimal symmetric-teleparallel dark energy

Semi-Classical Limit and Quantum Corrections in Non-Coincidence Power-Law f(Q)-Cosmology

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