Anisotropic f(Q) gravity model with bulk viscosity

IF 1.5 4区 物理与天体物理 Q3 ASTRONOMY & ASTROPHYSICS Modern Physics Letters A Pub Date : 2024-04-08 DOI:10.1142/s0217732324500238
M. Koussour, S. H. Shekh, M. Bennai, N. Myrzakulov
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Abstract

This study investigates the dynamics of a spatially homogeneous and anisotropic LRS Bianchi type-I Universe with viscous fluid in the framework of f(Q) symmetric teleparallel gravity. We assume a linear form for f(Q) and introduce hypotheses regarding the relationship between the expansion and shear scalars, as well as the Hubble parameter and bulk viscous coefficient. The model is constrained using three observational datasets: the Hubble dataset (31 data points), the Pantheon SN dataset (1048 data points), and the BAO dataset (6 data points). The calculated cosmological parameters indicate expected behavior for matter-energy density and bulk viscous pressure, supporting the universe’s accelerating expansion. Diagnostic tests suggest that the model aligns with a ΛCDM model in the far future and resides in the quintessence region. These findings are consistent with recent observational data and contribute to our understanding of cosmic evolution within the context of modified gravity and bulk viscosity.

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具有体积粘度的各向异性 f(Q) 重力模型
本研究在f(Q)对称远平行引力的框架内研究了空间均质和各向异性的LRS比安奇I型宇宙与粘性流体的动力学。我们假定 f(Q) 为线性形式,并引入了有关膨胀和剪切标量以及哈勃参数和体积粘性系数之间关系的假设。该模型使用三个观测数据集进行约束:哈勃数据集(31 个数据点)、Pantheon SN 数据集(1048 个数据点)和 BAO 数据集(6 个数据点)。计算得出的宇宙学参数显示了物质能量密度和体积粘性压力的预期行为,支持了宇宙的加速膨胀。诊断测试表明,该模型与遥远未来的ΛCDM 模型相一致,并位于五子星区域。这些发现与最近的观测数据一致,有助于我们在修正引力和体积粘性的背景下理解宇宙演化。
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来源期刊
Modern Physics Letters A
Modern Physics Letters A 物理-物理:核物理
CiteScore
3.10
自引率
7.10%
发文量
186
审稿时长
3 months
期刊介绍: This letters journal, launched in 1986, consists of research papers covering current research developments in Gravitation, Cosmology, Astrophysics, Nuclear Physics, Particles and Fields, Accelerator physics, and Quantum Information. A Brief Review section has also been initiated with the purpose of publishing short reports on the latest experimental findings and urgent new theoretical developments.
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