Keeping the relation between the Starobinsky model and no-scale supergravity ACTive

IF 5.9 2区物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS

Journal of Cosmology and Astroparticle Physics Pub Date : 2025-09-19 DOI:10.1088/1475-7516/2025/09/060

Ioannis D. Gialamas, Theodoros Katsoulas, Kyriakos Tamvakis

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Abstract

We introduce a modification of the Starobinsky model in the form of an additional cubic Ricci scalar curvature term ∼ αR ³, scaled by a dimensionless parameter α, with the resulting inflaton potential being the standard Starobinsky potential modified to first parametric order by an additive term. The resulting potential is identical to the potential obtained by a modification of the superpotential employed in the construction of the Starobinsky model in the framework of no-scale supergravity, thus, extending the correspondence between a class of no-scale supergravity models and modifications of the Starobinsky model. We analyze the inflationary predictions of the model and find that for -4.2 × 10^-5 ≲ α ≲ -1.9 × 10^-5, the modified Starobinsky model is in full agreement with the recent observational data from the Atacama Cosmology Telescope, for a range of e-folds, N _★ = 50–60.

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保持Starobinsky模型与无尺度超重力ACTive之间的关系

我们以一个附加的立方Ricci标量曲率项~ α r3的形式引入了Starobinsky模型的修改，该曲率项由一个无量纲参数α缩放，由此产生的暴胀势是标准的Starobinsky势，通过一个加性项修改为一参数阶。由此得到的势与在无尺度超重力框架下构建Starobinsky模型时对超势进行修正得到的势相同，从而扩展了一类无尺度超重力模型与修正的Starobinsky模型之间的对应关系。我们对模型的暴胀预测进行了分析，发现在-4.2 × 10-5≤α≤-1.9 × 10-5范围内，修正的Starobinsky模型与阿塔卡马宇宙学望远镜最近的观测数据完全吻合，在e-fold范围内N★= 50-60。

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来源期刊

Journal of Cosmology and Astroparticle Physics 地学天文-天文与天体物理

CiteScore

10.20

自引率

23.40%

发文量

632

审稿时长

1 months

期刊介绍： Journal of Cosmology and Astroparticle Physics (JCAP) encompasses theoretical, observational and experimental areas as well as computation and simulation. The journal covers the latest developments in the theory of all fundamental interactions and their cosmological implications (e.g. M-theory and cosmology, brane cosmology). JCAP''s coverage also includes topics such as formation, dynamics and clustering of galaxies, pre-galactic star formation, x-ray astronomy, radio astronomy, gravitational lensing, active galactic nuclei, intergalactic and interstellar matter.