Quantum induced ω = −1 crossing of the quintessence and phantom models

Alimohammadi, M.; Sadeghian, L.

doi:10.1088/1475-7516/2009/01/035

Cited by 7 publications

(3 citation statements)

References 41 publications

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“…the ω = −1 transitions, for these cases, are quantum induced. The same phenomenon has been seen for quintessence and phantom theories [18]. The quantum effects are described via the account of conformal anomaly, reminding about anomaly-driven inflation [19].…”

Section: Introductionsupporting

confidence: 60%

Remarks on generalized scalar-tensor models of dark energy

Alimohammadi

Behnamian

2009

Phys. Rev. D

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The generalized scalar-tensor models with Lagrangian $F(\phi,R)-U(\phi)(\nabla\phi)^2$ are considered. It is shown that the phantom-divide-line crossing and the deceleration to acceleration transition generally occurr in these models. Two specific examples, the coupled quintessence model and the Brans-Dicke model are considered. For the first example, it is shown that for the models with $\xi>3/16$, the $\omega=-1$ transition exists. This is verified numerically for some special cases. For the Brans-Dicke model, it is shown that the transition does not occur, a result which can be verified by using the exact solution of this model. Finally the contribution of quantum effects on these phenomena is investigated. It is shown that for some special cases where the $\omega=-1$ transition is classically forbidden, the quantum effects can induce transition. The $\xi=1/6$ of coupled quintessence model is an example of this. The quantum effects are described via the account of conformal anomaly.Comment: 20 pages, 5 figures, typos corrected, reference adde

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Section: Introductionsupporting

confidence: 60%

Remarks on generalized scalar-tensor models of dark energy

Alimohammadi

Behnamian

2009

Phys. Rev. D

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“…The quantum effects are described via the account of conformal anomaly, reminding about anomaly-driven inflation [15]. The contribution of conformal anomaly in energy conditions and big rip of phantom models has been discussed in [16], and its influence on the ω = −1 crossing and deceleration to acceleration transition of quintessence and phantom models, the F (R, G) gravity and the generalized scalar tensor models have been discussed in [17], [13] and [7], respectively.…”

Section: Introductionmentioning

confidence: 99%

Remarks on generalized Gauss-Bonnet dark energy

Alimohammadi

Ghalee

2009

Phys. Rev. D

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The modified gravity with F(R,G) Lagrangian, G is the Gauss-Bonnet invariant, is considered. It is shown that the phantom-divide-line crossing and the deceleration to acceleration transition generally occur in these models. Our results coincide with the known results of f(R)-gravity and f(G)-gravity models. The contribution of quantum effects to these transitions is calculated, and it is shown that in some special cases where there are no transitions in classical level, quantum contributions can induce transitions. The quantum effects are described via the account of conformal anomaly.Comment: 11 pages, LaTeX, a paragraph added, to be appeared in Phys. Rev.

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“…The quantum effects are described via the the account of conformal anomaly, reminding about anomaly-driven inflation [16]. The contribution of conformal anomaly in energy conditions and Big Rip of phantom models has been discussed in [17], and its influence on ω = −1 crossing of quintessence and phantom model has been studied in [18].…”

Section: Introductionmentioning

confidence: 99%

Remarks on generalized Gauss-Bonnet dark energy

Alimohammadi,

Ghalee

2008

Preprint

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The modified gravity with F (R, G) Lagrangian, G is the Gauss-Bonnet invariant, is considered. It is shown that the phantom-divide-line crossing and the deceleration to acceleration transition generally occur in these models. Our results coincide with the known results of f (R)-gravity and f (G)-gravity models. The contribution of quantum effects to these transitions is calculated, and it is shown that in some special cases where there are no transitions in classical level, quantum contributions can induce transitions. The quantum effects are described via the account of conformal anomaly.

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Quantum induced ω = −1 crossing of the quintessence and phantom models

Cited by 7 publications

References 41 publications

Remarks on generalized scalar-tensor models of dark energy

Remarks on generalized scalar-tensor models of dark energy

Remarks on generalized Gauss-Bonnet dark energy

Remarks on generalized Gauss-Bonnet dark energy

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