根据最新的ACT观测，分数吸引子

IF 4.5 2区物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS

Physics Letters B Pub Date : 2025-06-18 DOI:10.1016/j.physletb.2025.139664

Christian Dioguardi , Antonio J. Iovino , Antonio Racioppi

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引用次数: 0

摘要

根据ACT观测的最新结果，我们回顾了一类标记为分数吸引子的势，它们可以起源于帕拉蒂尼引力。我们表明，对于标量势V（ϕ）的某些选择，分数吸引子预测谱指数ns和张量-标量比r落在组合ACT+Planck数据的1σ区域内，适用于广泛的参数范围。在简单的二次和四次分数势的情况下，我们还提供了这些模型的参数空间的数值拟合。

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Fractional attractors in light of the latest ACT observations

In light of the latest results from ACT observations we review a class of potentials labeled as fractional attractors, that can originate from Palatini gravity. We show that, for certain choices of the scalar potential

V (ϕ)

, the fractional attractors predict both a spectral index

n_{s}

and a tensor-to-scalar ratio r that fall within the 1σ region of the combined ACT+Planck data for a wide range of parameters. We also provide a numerical fit for the parameter space of these models in the case of a simple quadratic and quartic fractional potential.

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来源期刊

Physics Letters B 物理-物理：综合

CiteScore

9.10

自引率

6.80%

发文量

647

审稿时长

3 months

期刊介绍： Physics Letters B ensures the rapid publication of important new results in particle physics, nuclear physics and cosmology. Specialized editors are responsible for contributions in experimental nuclear physics, theoretical nuclear physics, experimental high-energy physics, theoretical high-energy physics, and astrophysics.