The Stephani Universe, K-Essence and Strings in the 5th Dimension

The Stephani universe is an inhomogeneous alternative to ΛCDM. We show that the exotic fluid driving exact solution of Einstein’s equations unusual form k-essence linear in “velocity”. Much as can be embedded into (a section of) flat 5-d Minkowski space-time, we obtains through dimensional reduction a strongly coupled non-linear “electrodynamics” that, empty universe, corresponds space filling magnetic branes string/M-theory.