论文标题
Tsallis和Barrow宇宙学中扰动的增长
Growth of Perturbations in Tsallis and Barrow Cosmology
论文作者
论文摘要
我们揭示了熵校正对弗里德曼方程对宇宙早期扰动的增长的影响。我们考虑对熵区域定律的两种校正，称为Tsallis和Barrow熵。使用这些校正来熵，我们得出了修改后的弗里德曼方程，并探索了充满暗物质（DM）和宇宙常数的平坦宇宙中扰动的生长。我们采用球形对称的崩溃形式主义，并在线性方面进行扰动。有趣的是，我们发现密度对比的曲线与Tsallis和Barrow Cosmology的标准宇宙学大不相同。我们观察到，物质扰动的生长速率至关重要地取决于tsallis和Barrow参数的值。随着将这些校正参数增加到熵，总密度对比度也增加。这意味着在具有修改的熵校正的弗里德曼方程的宇宙中，扰动长得更快。
We disclose the effects of the entropic corrections to the Friedmann equations on the growth of perturbations in the early stages of the universe. We consider two types of corrections to the area law of entropy, known as Tsallis and Barrow entropies. Using these corrections to entropy, we derive the modified Friedmann equations and explore the growth of perturbations in a flat universe filled with dark matter (DM) and cosmological constant. We employ the spherically symmetric collapse formalism and work in the linear regime for the perturbations. Interestingly enough, we find out that the profile of density contrast quite differs from the standard cosmology in Tsallis and barrow cosmology. We observe that the growth rate of matter perturbations crucially depend on the values of Tsallis and Barrow parameters. With increasing these correction parameters to the entropy, the total density contrast increases as well. This implies that perturbations grow up faster in a universe with modified entropy corrected Friedmann equations.
