A positive cosmological constant as a geometrical artifact

Abstract

We revisit the classical mechanism to produce $d-$dimensional spacetimes via Kaluza-Klein compactification. We made the assumption that the $\left(d+1\right)-$dimensional bulk geometry $\mathcal{M}$ admits a Homothetic Vector Field (HVF) $\mathbf{H}$ relaxing the existence of a zero i.e. $\mathbf{H}\ne 0$ holds on $\mathcal{M}$ and the homothetic bivector $F_{ab}(\mathbf{H})=0$. Under these circumstances we identify the origin of a positive cosmological constant in the $d-$dimensional spacetime as the homothetic factor representing a geometrical artifact of late time state of the $\left(d+1\right)-$dimensional bulk spacetime.

6 pages, no figures, uses iop class style; (v2) some minor corrections, version to appear in Modern Physics Letter A

References in corpus (3)

• Embeddings for 4D Einstein equations with a cosmological constant
• Self-similar cosmologies in 5D: Our universe as a topological separation from an empty 5D Minkowski space
• Constructing a family of conformally flat scalar field models