摘要
We show that one can always derive the ~riedmann equation of an （n Jr 1）-dimensional Friedmann-Robertson- Walker universe in cubic quasi-topological gravity, by determining the difference between the bulk and the apparent horizon degrees of freedom in a region of space. We also generalize the study to the higher-order quasi-topological gravity, and extract the corresponding Friedmann equation in this theory by using the same approach.
We show that one can always derive the ~riedmann equation of an （n Jr 1）-dimensional Friedmann-Robertson- Walker universe in cubic quasi-topological gravity, by determining the difference between the bulk and the apparent horizon degrees of freedom in a region of space. We also generalize the study to the higher-order quasi-topological gravity, and extract the corresponding Friedmann equation in this theory by using the same approach.
