Reconstructing FHDE with Scalar and Gauge Fields

Abstract

We revisit the Fractional Holographic Dark Energy (FHDE) model to reconstruct it by means of dynamic candidates such as ($i$) Quintessence, ($ii$) K-essence, ($iii$) Dilaton, ($iv$) Yang-Mills condensate, ($v$) DBI-essence, and ($vi$) Tachyonic fields in a flat Friedmann-Robertson-Walker (FRW) Universe. In particular, the dark-energy possibilities ($i$)-($vi$) are formulated through suitable field descriptions. Being concrete, we establish a comprehensive correspondence between FHDE and suitable scalar and gauge field frameworks that co-substantiate our investigation and subsequent discussion. In more detail, we methodically compute the corresponding Equation of State (EoS) parameters and field (kinetic and potential) features for the fractional parameter ($\alpha$) range, viz. $1<\alpha \le 2$. Conclusively, our results show that the modifications brought by the fractional features satisfactorily enable late-time cosmic acceleration, together with avoiding quantum instabilities by preventing the EoS from entering the phantom divide i.e., $\omega (z)\to -\infty$, which is a common issue in standard scalar field models without fractional dynamics (e.g., K-essence field). Our findings further indicate that fractional calculus attributes can be significant in addressing the challenges of dark-energy models by offering a robust framework to prospect late-time acceleration and properly fitting observational constraints. Notably, we find that as the fractional features start to dominate, the EoS parameter of all the effective field configurations asymptotically approaches a $\Lambda$CDM behaviour in the far-future limit $z\to -1$. In summary, the recent perspective introduced by FHDE \citep{Trivedi:2024inb} can indeed be cast as a promising aspirant through the use of prominent field frameworks.

27 pages & 17 figures. Comments are very welcome!

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