论文标题
DGP Braneworld宇宙学中的球形崩溃
Spherical collapse in DGP braneworld cosmology
论文作者
论文摘要
DGP（Dvali，Gabadaze和Porrati）Braneworld Cosmology可以替代黑暗能量。在DGP宇宙学中，所谓的宇宙加速度是通过重力理论的修改产生的。目前的工作中研究了DGP Braneworld宇宙学中物质密度对比的非线性进化。在当前情况下，采用了物质过度密度的球形崩溃的半分析方法来研究非线器的演化。此外，使用Press-Schechter和Sheth-Tormen质量功能形式主义研究了DGP宇宙学沿着红移的星系簇数量。观察到，对于宇宙学参数的相同值，与标准$λ$ CDM方案相比，DGP模型增强了星系群的数量。
The DGP (Dvali, Gabadaze and Porrati) braneworld cosmology gives an alternative to dark energy. In DGP cosmology the alleged cosmic acceleration is generated by the modification of gravity theory. Nonlinear evolution of matter density contrast in DGP braneworld cosmology is studied in the present work. The semi-analytic approach of spherical collapse of matter overdensity is adopted in the present context to study the nonliner evolution. Further, the number count of galaxy clusters along the redshift is studied for the DGP cosmology using Press-Schechter and Sheth-Tormen mass function formalisms. It is observed that for same values of cosmological parameters, the DGP model enhances the number of galaxy cluster compared to the standard $Λ$CDM scenario.
