AI 中文总结
研究\(f(\mathcal{Q})\)理论中体黏性对宇宙反弹解的影响，采用\(\zeta=\zeta_{0}H\)参数化，通过考虑宇宙演化及相关参数评估反弹解，结合热力学研究熵演化，结果显示\(f(\mathcal{Q})\)引力为标准模型提供替代并助于洞察引力与早期宇宙。
AI 中文摘要
本文研究了在\(f(\mathcal{Q})\)理论背景下，体黏性对宇宙反弹解可行性的影响，其中\(\mathcal{Q}\)是非度规标量。通过考虑充满理想流体的各向同性均匀宇宙的行为，并采用\(\zeta=\zeta_{0}H\)的体黏性系数创新参数化（\(\zeta_0\)为任意常数），研究修正理论如何影响宇宙演化，探索一系列宇宙学参数以评估反弹解的存在性和物理可行性。还通过热力学第二定律研究熵的演化。能量密度的正趋势、负压强分布和能量条件的违反支持了可行宇宙反弹情景的存在，突出了体黏性在该框架中的重要性。这些结果表明\(f(\mathcal{Q})\)引力为标准宇宙模型提供了有吸引力的替代方案，并深入洞察了引力相互作用和早期宇宙的本质。
英文摘要
This manuscript investigates the impact of bulk viscosity on the viability of cosmic bounce solutions in the context of $f(\mathcal{Q})$ theory, where $\mathcal{Q}$ is a non-metricity scalar. To complete this objective, we study the behavior of an isotropic homogeneous universe filled with a perfect fluid and consider a innovative parametrization of bulk viscosity coefficient with an arbitrary constant $ζ_0$ as $ζ=ζ_{0}H$. We consider the particular functional form of this modified theory to explore how this gravitational framework influences the cosmic evolution and explore a range of cosmological parameters to assess the existence and physical viability of bounce solutions. We also investigate the evolution of entropy through the second law of thermodynamics. The positive trend of energy density, negative pressure profile and violation of energy conditions support the existence of viable cosmological bounce scenario and highlights the significance of bulk viscosity in this framework. These results demonstrate that $f(\mathcal{Q})$ gravity provides a compelling alternative to standard cosmic models and provides deep insights into the nature of gravitational interaction and the early cosmos.
Comments21 pages, 6 figures
Journal refPhysics Letters A 577(2026)131427
