具有空间变化的暗能量和暗物质轮廓的非均匀宇宙学

IF 5.3 2区物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS

Journal of Cosmology and Astroparticle Physics Pub Date : 2025-06-23 DOI:10.1088/1475-7516/2025/06/048

D. Comelli

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引用次数: 0

摘要

我们分析了一个非均匀宇宙学模型，该模型具有由统一的单一完美流体诱导的球对称气泡溶液，其中包括空间依赖的暗能量（w = -1）和暗物质（w = 0）组分。我们将哈勃剖面与早期的普朗克值（h0 = 67.4±0.5 Km/s Mpc）和局部值（h0 = 73.52±1.62 Km/s Mpc）相匹配。我们明确导出了两种不同区域的微扰解：一种是围绕中心展开的（对于小r h h 0≪1），另一种是围绕均匀FRW宇宙展开的。在这两种情况下，我们都计算了宇宙学参数、哈勃膨胀率的红移曲线和有效状态方程。此外，我们研究了扩展到lema度量的红移漂移行为。

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Inhomogeneous cosmology with space-varying dark energy and dark matter profiles

We analyse an inhomogeneous cosmological model featuring a spherically symmetric bubble solution induced by a unified single perfect fluid, comprising spatially dependent Dark Energy (with w = -1) and Dark Matter (with w = 0) components. We impose an Hubble profile that matches the Planck value at early times (h0 = 67.4 ± 0.5 Km/s Mpc) and the local value (ℋ0 = 73.52 ± 1.62 Km/s Mpc). We explicitly derive perturbative solutions in two distinct regimes: one expanded around the center (for small r ℋ0 ≪ 1) and the other expanded around a homogeneous FRW universe. In both cases, we compute the cosmographic parameters, redshift profiles for the Hubbles expansion rates, and effective equations of state. Furthermore, we investigate the redshift drift behaviour extended to a Lemaître metric.

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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.