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arXiv 2006.16074gr-qc
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指数幂律膨胀的精确解与慢滚解及其与f(R)引力的联系和观测约束

Exact and slow-roll solutions for exponential power-law inflation connected with f(R) gravity and observational constraints

I. V. Fomin, S. V. Chervon

AI总结:

本研究在Ivanov-Salopek-Bond表示下求解指数幂律膨胀的精确与慢滚解,重建f(R)引力,并验证其符合PLANCK 2018观测约束。

摘要:

我们研究了指数幂律膨胀作为早期宇宙现象学上正确模型的可行性。我们在Ivanov-Salopek-Bond(或类Hamilton-Jacobi)表示下研究广义相对论标量宇宙学方程,其中哈勃参数H是标量场ϕ的函数。这种方法允许在给定H(ϕ)的情况下计算势能,并因此以参数形式重建f(R)引力。通过这种方式,利用对模型参数的约束,重建了Starobinsky势和非最小耦合Higgs势(以及相应的f(R)引力)。此外,与观测(PLANCK 2018)数据的比较表明,在指数幂律模型参数的广泛范围内,两种模型都给出了标量谱指数和张量-标量比的正确值。

英文摘要:

We investigate an ability of the exponential power-law inflation to be phenomenologically correct model of the early universe. GR scalar cosmology equations we study in Ivanov-Salopek-Bond (or Hamilton-Jacobi like) representation where the Hubble parameter $H$ is the function of a scalar field $ϕ$. Such approach admits calculation of the potential for given $H(ϕ)$ and consequently reconstruction of $f(R)$ gravity in parametric form. By this manner the Starobinsky potential and non-minimal Higgs potential (and consequently the corresponding $f(R)$ gravity) were reconstructed using constraints on model's parameters. Also comparison to observation (PLANCK 2018) data shows that both models give correct values for scalar spectral index and tensor-to-scalar ratio under wide range of exponential-power-law model's parameters.

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