An ellipsoidal universe in the brane world

作者：Ge Xian Hui^*; Kim Sang Pyo

来源：Journal of Cosmology and Astroparticle Physics, 2007, 2007(7): 001.

DOI：10.1088/1475-7516/2007/07/001

• cosmology with extra dimensions
• cosmological applications of theories with extra dimensions

We study a scenario of an ellipsoidal universe in the brane world cosmology with a cosmological constant in the bulk. From the five-dimensional Einstein equations we derive the evolution equations for the eccentricity and the scale factor of the universe, which are coupled to each other. It is found that if the anisotropy of our universe originates from a uniform magnetic field inside the brane, the eccentricity decays faster in the bulk in comparison with a four-dimensional ellipsoidal universe. We also investigate an ellipsoidal universe in brane-induced gravity and find the evolution equation for the eccentricity which has a contribution determined by the four- and five-dimensional Newton constants. The role of the eccentricity is discussed in explaining the quadrupole problem of the cosmic microwave background.

• 出版日期2007-7