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arXiv · 1902.05846

Anisotropic $2$-form dark energy

Juan P. Beltrán Almeida·Alejandro Guarnizo·Ryotaro Kase·Shinji Tsujikawa·César A. Valenzuela-Toledo
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Abstract

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 $e^{-μϕ/M_{\rm pl}} H_{αβγ}H^{αβγ}$ and the scalar potential $V(ϕ) \propto e^{-λϕ/M_{\rm pl}}$, where $H_{αβγ}$ is the 2-form field strength, $μ, λ$ are constants, and $M_{\rm pl}$ 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 $λ\geq {\cal O}(1)$, it is possible to realize the dark energy equation of state $w_{\rm DE}$ close to $-1$ at low redshifts for $μ\gg λ$. The existence of anisotropic hair and the oscillating behavior of $w_{\rm DE}$ are key features for distinguishing our scenario from other dark energy models like quintessence.

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Juan P. Beltrán Almeida, Alejandro Guarnizo, Ryotaro Kase, Shinji Tsujikawa, César A. Valenzuela-Toledo. 2019-02-15. Anisotropic $2$-form dark energy. https://doi.org/10.1016/j.physletb.2019.05.008

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