Anisotropic 2-form dark energy
Anisotropic 2-form dark energy
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DOI：
10.1016/j.physletb.2019.05.008
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发表时间：
2019-02
影响因子：
4.4
通讯作者：
J. P. Almeida;Alejandro Guarnizo;R. Kase;S. Tsujikawa;César A. Valenzuela-Toledo
中科院分区：
文献类型：
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作者：
J. P. Almeida;Alejandro Guarnizo;R. Kase;S. Tsujikawa;César A. Valenzuela-Toledo
我们研究存在与正则标量场 ψ 耦合的 2 型场时暗能量的动力学。我们考虑与 e− μ φ/M pl H α β γ H α β γ 和标量势 V (φ)∝ e− λ φ/M pl 成正比的耦合，其中 H α β γ 是 2 型场强，μ、λ 是常数，M pl 是约简普朗克质量。我们证明了存在各向异性物质主导的标度解，随后是具有非消失剪切的稳定加速固定点。即使λ≥ O (1)，对于μ≫ λ，也可以在低红移下实现接近− 1 的暗能量状态方程w DE 。各向异性毛发的存在和 w DE 的振荡行为是将我们的场景与其他暗能量模型（如精华）区分开来的关键特征。
We study the dynamics of dark energy in the presence of a 2-form field coupled to a canonical scalar field ϕ. We consider the coupling proportional to e− μ ϕ/M pl H α β γ H α β γ and the scalar potential V (ϕ)∝ e− λ ϕ/M pl, where H α β γ is the 2-form field strength, μ, λ are constants, and M pl is the reduced Planck mass. We show the existence of an anisotropic matter-dominated scaling solution followed by a stable accelerated fixed point with a non-vanishing shear. Even if λ≥ O (1), it is possible to realize the dark energy equation of state w DE close to− 1 at low redshifts for μ≫ λ. The existence of anisotropic hair and the oscillating behavior of w DE are key features for distinguishing our scenario from other dark energy models like quintessence.