CMB constraints on natural inflation with gauge field production

IF 5.3 2区 物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS
Khursid Alam, Koushik Dutta and Nur Jaman
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Abstract

The natural inflation model with a periodic cosine potential is ruled out by recent Planck 2018 data for the decay constant f ≲ 5.5 MPl. If the Planck data is combined with the BICEP Keck array and BAO data, the model is excluded (at 2-σ) for all values of f. In this context, we revisit the model when the pseudoscalar inflation ϕ is coupled with a gauge field via a coupling of the form α/fϕFF̃, where F(F̃) denotes the gauge field (dual) strength tensor, and α is the coupling constant. The back-reactions associated with the gauge field production during the later stages of inflation extend the duration of inflation. We numerically evaluate the dynamics of the fields while neglecting the effects due to the perturbations in the inflaton field. It allows us to determine the scalar and tensor power spectra leading to the calculations of observables at the Cosmic Microwave Background (CMB) scales. We find that the natural inflation model survives the test of the latest data only for a certain range of the coupling constant α. Our analysis shows that the latest constraints coming from the scalar spectral index are more stringent than the ones arising from the non-gaussianities and the running of the scalar spectrum. This leads to lower and upper bounds on ξ*, the parameter that controls the growth of the gauge field.
CMB对油田自然膨胀量的限制
最近的普朗克2018数据排除了具有周期性余弦势的自然暴胀模型,其衰变常数为f > 5.5 MPl。如果将普朗克数据与BICEP Keck阵列和BAO数据相结合,则所有f值的模型都被排除(在2-σ处)。在这种情况下,当伪标量膨胀φ通过形式α/fϕFF→的耦合与规范场耦合时,我们重新审视模型,其中f (f→)表示规范场(对偶)强度张量,α是耦合常数。在通货膨胀后期,与油田产量相关的反反应延长了通货膨胀的持续时间。我们用数值方法计算了场的动力学,忽略了膨胀场中扰动的影响。它使我们能够确定标量和张量功率谱,从而计算宇宙微波背景(CMB)尺度上的可观测值。我们发现自然暴胀模型仅在耦合常数α的一定范围内经受住了最新数据的检验。我们的分析表明,来自标量谱指数的最新约束比来自非高斯性和标量谱运行的约束更为严格。这导致控制规范场增长的参数ξ*的下界和上界。
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来源期刊
Journal of Cosmology and Astroparticle Physics
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.
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