Evolution of the Magnetic Component in Yang–mills Condensate Dark Energy Models

Zhao, Wen; Xu, Donghui

doi:10.1142/s0218271807011048

“…For simplicity, we only discuss the case of pure "electric" condensate with F = E 2 (the case of including magnetic component was discussed in Ref. [65]). The effective Lagrangian, defined as…”

Section: -Loop Ymc Modelmentioning

confidence: 99%

“…Notice that the Lorentz invariance is preserved in the effective YM theory, because the Lagrangian is constructed out of combinations of F a μν F a μν [21,22,64]. For simplicity, we only discuss the case of a pure 'electric' condensate with F = E 2 (the case including a magnetic component was discussed in [65]). The effective Lagrangian, defined as L eff = F/2g 2 (F ), is given by…”

Section: The Three-loop Ymc Modelmentioning

confidence: 99%

The three-loop Yang–Mills condensate dark energy model and its cosmological constraints

Wang¹,

Zhang²,

Xia³

2008

J. Cosmol. Astropart. Phys.

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This work is a comprehensive investigation of the Yang-Mills condensate (YMC) dark energy (DE) model, which is extended to include the 3-loop quantum corrections. We study its cosmic evolution and the possibility of crossing phantom divide w = −1, examine in details the Hubble parameter H, the deceleration parameter q, the statefinder diagnosis (r, s), and the w−w ′ diagnosis of the model without and with interaction, and compare our results with other DE models. Besides, by using the observational data of type Ia supernovae (SNIa), the shift parameter from cosmic microwave background (CMB), and the baryon acoustic oscillation (BAO) peak from large scale structures (LSS), we give the cosmological constraints on 3-loop YMC model. It is found that the model can naturally solve the coincidence problem, and its prediction of the afore-mentioned parameter is much closer to the ΛCDM model than other dynamics DE models; the introduction of the matter-DE interaction will make the YMC model deviating from the ΛCDM model, and will give an equation of state (EOF) crossing −1. Moreover, it is also found that, to fit the latest SNIa data alone, the ΛCDM model is slightly better *

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“…In this paper, for simplicity, we only discuss the pure 'electric' case, F = E 2 . This is a typical consideration, since in the expanding universe, a given 'magnetic' component of Yang-Mills field decreases quite rapidly, and the Yang-Mills field becomes the 'electric' type [26]. The energy density and pressure of YMC are reduced to…”

Section: Ymc As Dark Energymentioning

confidence: 99%

Quantum Yang-Mills Condensate Dark Energy Models

Zhao¹,

Tong²,

Zhang³

2009

Preprint

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We review the quantum Yang-Mills condensate (YMC) dark energy models. As the effective Yang-Mills Lagrangian is completely determined by the quantum field theory, there is no adjustable parameter in the model except the energy scale. In this model, the equation-of-state (EOS) of the YMC dark energy, wy > −1 and wy < −1, can both be naturally realized. By studying the evolution of various components in the model, we find that, in the early stage of the universe, dark energy tracked the evolution of the radiation, i.e. wy → 1/3. However, in the late stage, wy naturally runs to the critical state with wy = −1, and the universe transits from matter-dominated into dark energy dominated stage only at recently z ∼ 0.3. These characters are independent of the choice of the initial condition, and the cosmic coincidence problem is avoided in the models. We also find that, if the possible interaction between YMC and dust matter is considered, the late time attractor solution may exist. In this case, the EOS of YMC must evolve from wy > 0 into wy < −1, which is slightly suggested by the observations. At the same time, the total EOS in the attractor solution is wtot = −1, the universe being the de Sitter expansion in the late stage, and the cosmic big rip is naturally avoided. These features are all independent of the interacting forms.

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“…For simplicity, we only discuss the case of pure "electric" condensate with F = E 2 (the case of including magnetic component was discussed in Ref. [65]). The effective Lagrangian, defined as L ef f = F/2g 2 (F ), is given by…”

Section: -Loop Ymc Modelmentioning

confidence: 99%

3-loop Yang-Mills Condensate Dark Energy Model And Its Cosmological Constraints

Wang,

Zhang,

Xia

2008

Preprint

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This work is a comprehensive investigation of the Yang-Mills condensate (YMC) dark energy (DE) model, which is extended to include the 3-loop quantum corrections. We study its cosmic evolution and the possibility of crossing phantom divide w = −1, examine in details the Hubble parameter H, the deceleration parameter q, the statefinder diagnosis (r, s), and the w−w ′ diagnosis of the model without and with interaction, and compare our results with other DE models. Besides, by using the observational data of type Ia supernovae (SNIa), the shift parameter from cosmic microwave background (CMB), and the baryon acoustic oscillation (BAO) peak from large scale structures (LSS), we give the cosmological constraints on 3-loop YMC model. It is found that the model can naturally solve the coincidence problem, and its prediction of the afore-mentioned parameter is much closer to the ΛCDM model than other dynamics DE models; the introduction of the matter-DE interaction will make the YMC model deviating from the ΛCDM model, and will give an equation of state (EOF) crossing −1. Moreover, it is also found that, to fit the latest SNIa data alone, the ΛCDM model is slightly better

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Evolution of the Magnetic Component in Yang–mills Condensate Dark Energy Models

Cited by 11 publications

References 45 publications

The three-loop Yang–Mills condensate dark energy model and its cosmological constraints

The three-loop Yang–Mills condensate dark energy model and its cosmological constraints

Quantum Yang-Mills Condensate Dark Energy Models

3-loop Yang-Mills Condensate Dark Energy Model And Its Cosmological Constraints

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