标题： 修正的 $f(Q)$ 引力模型及其宇宙学后果 显示英文标题

标题： Modified $f(Q)$ gravity models and their cosmological consequences

摘要： 在这项工作中，我们考虑了三种不同的幂律、指数和对数 $f(Q)$ 模型，以从理论上研究哪个模型能更好地模拟 $\Lambda$ CDM 的演化。 因此，我们在各向同性和均匀的宇宙中确定了 $f(Q)$ 引力场方程的解。 由于所有模型都包含两个模型参数，我们利用当前时刻的弗里德曼第一方程来降低自由度。 此外，我们利用场方程的解检查宇宙学参数的行为，并将其与 $\Lambda$ CDM 模型进行比较。 因此，幂律模型在 $\Lambda$ 冷暗物质模型与 $\lambda=-1$ 和 $\lambda=-2$ 时表现出很好的拟合，而指数模型在范围 $5\le \beta<11$ 内表现良好，对数模型在 $3.8<\gamma<4.4$ 时匹配。 显示英文摘要

摘要： In this work, we consider three different $f(Q)$ models, such as power-law, exponential, and logarithmic, to study which model better mimics $\Lambda$CDM evolution theoretically. Henceforth, we determine solutions to the $f(Q)$ gravity field equations in the isotropic and homogeneous universe. Since all the models contain two model parameters, we reduce the degrees of freedom using the first Friedman equation at the present time. Further, we check the behavior of cosmological parameters using the obtained solution to the field equations and compare it with the $\Lambda$CDM model. As a result, the power-law model shows a good match with $\Lambda$CDM model for $\lambda=-1$ and $\lambda=-2$, while the exponential model behaves well for the range $5\le \beta<11$, and the logarithmic model matches for $3.8<\gamma<4.4$.