Matter creation cosmology with generalized Chaplygin gas

IF 1.8 4区物理与天体物理 Q3 ASTRONOMY & ASTROPHYSICS

Astrophysics and Space Science Pub Date : 2024-01-12 DOI:10.1007/s10509-024-04267-w

Yogesh Bhardwaj, C. P. Singh

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Abstract

In this work, we discuss the dynamics of a spatially homogeneous and isotropic flat Friedmann-Lemaître-Robertson-Walker (FLRW) model of the Universe powered by the gravitationally induced ‘adiabatic’ matter creation with generalized Chaplygin gas (GCG) equation of state. In recent years, the CGC has been proposed successfully to unify the dark matter and dark energy by using an exotic equation of state \(p=-A/\rho ^{\alpha }\). Considering adiabatic matter creation cosmology, as developed by Prigogine et al, we examine the effect of matter creation in describing the unification with GCG by assuming the natural phenomenological matter creation rate \(\Gamma =3\beta H\), where \(\beta \) is a constant and \(H\) is the Hubble parameter. We constrain the proposed model using a joint observational dataset of Type Ia supernovae Pantheon, \(H(z)\) and BAO with Markov-Chain Monte-Carlo (MCMC) method. In addition, we discuss the selection criterion (AIC and BIC) and stability criteria to analyze the dynamics and differences with the standard \(\Lambda \)CDM model.

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具有广义查普利金气体的物质创造宇宙学

在这项工作中，我们讨论了由引力诱导的 "绝热 "物质创造和广义查普利金气体（GCG）状态方程驱动的空间均匀和各向同性平面弗里德曼-勒梅特-罗伯逊-沃克（FLRW）宇宙模型的动力学。近年来，人们成功地提出了广义查普利金气体模型（CCG），通过使用一个奇特的状态方程\(p=-A/\rho ^{\alpha }\) 来统一暗物质和暗能量。考虑到Prigogine等人提出的绝热物质生成宇宙学，我们通过假设自然现象学的物质生成率\(\Gamma =3\beta H\) （其中\(\beta \)是常数，\(H\)是哈勃参数）来考察物质生成对描述与GCG统一的影响。我们使用马尔可夫链蒙特卡洛（MCMC）方法，利用Ia型超新星Pantheon、（H（z））和BAO的联合观测数据集来约束所提出的模型。此外，我们还讨论了选择标准（AIC 和 BIC）和稳定性标准，以分析其动态性以及与标准 \(\Lambda \)CDM模型的差异。

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来源期刊

Astrophysics and Space Science 地学天文-天文与天体物理

CiteScore

3.40

自引率

5.30%

发文量

106

审稿时长

2-4 weeks

期刊介绍： Astrophysics and Space Science publishes original contributions and invited reviews covering the entire range of astronomy, astrophysics, astrophysical cosmology, planetary and space science and the astrophysical aspects of astrobiology. This includes both observational and theoretical research, the techniques of astronomical instrumentation and data analysis and astronomical space instrumentation. We particularly welcome papers in the general fields of high-energy astrophysics, astrophysical and astrochemical studies of the interstellar medium including star formation, planetary astrophysics, the formation and evolution of galaxies and the evolution of large scale structure in the Universe. Papers in mathematical physics or in general relativity which do not establish clear astrophysical applications will no longer be considered. The journal also publishes topically selected special issues in research fields of particular scientific interest. These consist of both invited reviews and original research papers. Conference proceedings will not be considered. All papers published in the journal are subject to thorough and strict peer-reviewing. Astrophysics and Space Science features short publication times after acceptance and colour printing free of charge.