摘要
To solve the cosmological constant fine tuning problem,we investigate an(n+1)-dimensional generalized Randall-Sundrum brane world scenario with two(n−1)-branes instead of two 3-branes.Adopting an anisotropic metric ansatz,we obtain the positive effective cosmological constantΩeff of order 10−124 and only require a solution≃50−80.Meanwhile,both the visible and hidden branes are stable because their tensions are positive.Therefore,the fine tuning problem can be solved quite well.Furthermore,the Hubble parameter H1(z)as a function of redshift z is in good agreement with the cosmic chronometers dataset.The evolution of the universe naturally shifts from deceleration to acceleration.This suggests that the evolution of the universe is intrinsically an extra-dimensional phenomenon.It can be regarded as a dynamic model of dark energy that is driven by the evolution of the extra dimensions on the brane.
作者
Guang-Zhen Kang
De-Sheng Zhang
Li Jun
Hong-Shi Zong
康广震;张德生;李俊;宗红石(School of Science,Yangzhou Polytechnic Institute,Yangzhou 225127,China;Department of Physics,Nanjing University,Nanjing 210093,China;School of Science,Changzhou Institute of Technology,Changzhou 213032,China;Joint Center for Particle,Nuclear Physics and Cosmology,Nanjing 210093,China;State Key Laboratory of Theoretical Physics,Institute of Theoretical Physics,CAS,Beijing 100190,China)
基金
Supported by State Key Program of National Natural Science Foundation of China(11535005)
the National Natural Science Foundation of China(11647087),the Natural Science Foundation of Yangzhou Polytechnic Institute(201917)
the Natural Science Foundation of Changzhou Institute of Technology(YN1509)。
