Perfect-fluid higher-dimensional cosmologies

Brane cosmology in an arbitrary number of dimensions

“…From now on, we drop the tildes in the metric coefficients and time coordinate above. This is the product of a cosmological 4d spacetime with an internal sphere with time-dependent radius, in which matter is allowed to propagate, as is familiar from traditional KaluzaKlein cosmology [48][49][50][51]. We now show, using the same reasoning as in D = 5, why dark radiation is no longer uniquely defined from the assumption of 3d homogeneity and isotropy, and not even after assuming spherical symmetry around the brane.…”

“…Following traditional Kaluza-Klein cosmology [48][49][50][51], three simple cases may be considered for the equations of state. In the early radiation era or decompactification regime, for large temperature T ≫ 1/R, incoherent radiation is not sensitive to the compactness of the internal space and is fully isotropic:…”

Higher-dimensional Bianchi type-III universe with strange quark matter attached to string cloud in general relativity

“…The physics of the universe in higher-dimensional space-time have been studied by many authors [8][9][10].…”

Big Rip Singularity in 5D Viscous Cosmology

“…The latest developments of super-string theory and super-gravitational theory have created interest among scientists to consider higherdimensional space-time, for study of the early universe. A number of authors [1][2][3][4] have studied physics of the universe in higher-dimensional space-time. Overduin and Wesson [5] have presented an excellent review of higher-dimensional unified theories, in which the cosmological and astrophysical implications of extra-dimension have been discussed.…”