Phantom-Like Behavior in Modified Teleparallel Gravity

Karimzadeh, Sakineh; Shojaee, Raheleh

doi:10.1155/2019/4026856

Cited by 6 publications

(3 citation statements)

References 46 publications

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“…[24][25][26][27][28][29][30][31][32] The crossing of the phantom divide line by the dark energy equation of state has two possible cosmic indications. [33][34][35][36][37][38] One is either the dark energy consists of numerous components, at least one of which is a noncanonical phantom component, or general relativity must be extended to a cosmological scale theory. The current study looks into the cosmic evolution in the exponential [39,40,48] and logarithmic [40] f (Q) theories.…”

Section: Introductionmentioning

confidence: 99%

Crossing Phantom Divide in f(Q)$f(Q)$ Gravity

Arora

Sahoo

2022

Annalen der Physik

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We investigate the possibility of crossing a phantom divide line in the extension of symmetric teleparallel gravity or the f (Q) gravity, where Q is the non-metricity. We study the cosmic evolution of the effective equation of state parameter for dark energy considering exponential, logarithmic, and combined f (Q) theories. Moreover, the exponential model behaves like the ΛCDM at high redshifts before deviating to ω e f f < −1 or ω e f f > −1, respectively, depending on the value of model parameter. It also approaches a de-sitter phase asymptotically. However, the crossing of the phantom divide line, i.e., ω = −1, is realized in the combined f (Q) theory. Furthermore, statefinder diagnostics are studied in order to differentiate between several dark energy models. To ensure the three model's stability, we employ the stability analysis using linear perturbations. We demonstrate how to reassemble f (Q) via a numerical inversion approach based on existing observational constraints on cosmographic parameters and the potential of bridging the phantom divide in the resulting model. It explicitly demonstrates that future crossings of the phantom dividing line are a generic feature of feasible f (Q) gravity models.

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Section: Introductionmentioning

confidence: 99%

Crossing Phantom Divide in f(Q)$f(Q)$ Gravity

Arora

Sahoo

2022

Annalen der Physik

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“…Apart from this, it has some other advantages such that the slow roll conditions that are assumed to hold; thus, the observational indices have general expressions regarding the slow-roll parameters in the inflationary scenario investigated by Odintsov et al [48]. Using modified teleparallel gravity, Karimzadeh et al demonstrated the possibility of achieving effective phantom behavior without adopting phantom fields [49]. The scalar perturbation technique creates the perturbed evolution equations, and their stability has been demonstrated by Duchaniya et al [50].…”

Section: Introductionmentioning

confidence: 99%

Bouncing Cosmology in Modified Gravity with Higher-Order Gauss–Bonnet Curvature Term

et al. 2022

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In this paper, we studied the bouncing behavior of the cosmological models formulated in the background of the Hubble function in the F(R,G) theory of gravity, where R and G, respectively, denote the Ricci scalar and Gauss–Bonnet invariant. The actions of the bouncing cosmology are studied with a consideration of the different viable models that can resolve the difficulty of singularity in standard Big Bang cosmology. Both models show bouncing behavior and satisfy the bouncing cosmological properties. Models based on dynamical, deceleration, and energy conditions indicate the accelerating behavior at the late evolution time. The phantom at the bounce epoch is analogous to quintessence behavior. Finally, we formulate the perturbed evolution equations and investigate the stability of the two bouncing solutions.

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Section: Introductionmentioning

confidence: 99%

Bouncing cosmology in modified gravity with higher-order Gauss-Bonnet curvature term

Lohakare¹,

Tello‐Ortiz²,

Tripathy³

et al. 2022

Preprint

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In this paper, we have studied the bouncing behaviour of the cosmological models formulated at the background of Hubble function in F(R, G) theory of gravity, where R and G respectively denotes the Ricci scalar and Gauss-Bonnet invariant. The actions of bouncing cosmology are studied under consideration of different viable models and can resolve the difficulty of singularity in standard Big-Bang cosmology. Both the models are showing bouncing behaviour and satisfying the bouncing cosmological properties. Models based on dynamical, deceleration, and energy conditions indicate the accelerating behavior at the late evolution time. Phantom at the bounce epoch is analogous to a quintessence behavior. Finally, we formulate the perturbed evolution equations and investigate the stability of two bouncing solutions.

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Phantom-Like Behavior in Modified Teleparallel Gravity

Cited by 6 publications

References 46 publications

Crossing Phantom Divide in f(Q)$f(Q)$ Gravity

Crossing Phantom Divide in f(Q)$f(Q)$ Gravity

Bouncing Cosmology in Modified Gravity with Higher-Order Gauss–Bonnet Curvature Term

Bouncing cosmology in modified gravity with higher-order Gauss-Bonnet curvature term

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