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Abstract: We propose a new fluid model of dark energy for $-1 \leq \omega {\text{eff}}\leq 0$ as an alternative to the generalized Chaplygin gas models. The energydensity of dark energy fluid is severely suppressed during barotropic matterdominant epochs, and it dominates the universe evolution only for eras of smallredshift. From the perspective of fundamental physics, the fluid is a tachyonfield with a scalar potential flatter than that of power-law deceleratedexpansion. Different from the standard $\Lambda\text{CDM}$ model, the suggesteddark energy model claims that the cosmic acceleration at present epoch can notcontinue forever but will cease in the near future and a decelerated cosmicexpansion will recover afterwards.



Autor: Hoavo Hova, Huanxiong Yang

Fuente: https://arxiv.org/







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