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arXiv 1503.07575hep-thastro-ph.CO
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超引力中标量场的暴胀和暗能量

Inflation and Dark Energy from a Scalar Field in Supergravity

Ricardo C. G. Landim

摘要:

本文从四维$\mathcal{N}=1$超引力出发,提出了一个宇宙加速膨胀的模型,包括暴胀过程和膨胀的现阶段。我们计算了张量标量比($r\approx 0.00034$)、标量谱指数($n_s\approx 0.970$)和运行谱指数($dn_s/dk\approx -6\times10^{-5}$),发现这些参数在$95\%$ CL下与Planck+WP+透镜数据和BICEP 2/Keck和Planck联合分析结果一致。e-折叠数为$50$或更高。再加热期有一个相应的温度$T_R\sim10^{12}$ GeV,这与热稀薄成因所要求的温度一致。考虑到标量场作为暗能量,在正压流体存在下的自治系统提供了一个稳定的固定点,导致宇宙的后期加速膨胀,状态方程模仿宇宙常数($w_Φ\approx -0.997$)。

英文摘要:

In this paper we present a model for accelerated expansion of the universe, both during inflation and the present stage of the expansion, from four dimensional $\mathcal{N}=1$ supergravity. We evaluate the tensor-to-scalar ratio ($r\approx 0.00034$), the scalar spectral index ($n_s\approx 0.970$) and the running spetral index ($dn_s/dk\approx -6\times10^{-5}$), and we notice that these parameters are in agreement with Planck+WP+lensing data and with BICEP2/Keck and Planck joint analysis, at $95\%$ CL. The number of e-folds is $50$ or higher. The reheating period has an associated temperature $T_R\sim10^{12}$ GeV, which agrees with the one required by thermal leptogenesis. Regarding the scalar field as dark energy, the autonomous system for it in the presence of a barotropic fluid provides a stable fixed point that leads to a late-time accelerated expansion of the universe, with an equation of state that mimics the cosmological constant ($w_Φ\approx -0.997$).

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