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 −μϕ/M pl H αβγ H αβγ and the scalar potential V(ϕ)∝e −λϕ/M pl , where H αβγ 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.
|ジャーナル||Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics|
|出版ステータス||Published - 2019 6月 10|
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