Dark Energy from Topology

Made available in DSpace on 2020-12-12T02:04:44Z (GMT). No. of bitstreams: 0 Previous issue date: 2020-03-01 The concordance model of cosmology suffers from the major theoretical problems surrounding the observed value and recent emergence of a cosmological constant. In this paper we present a novel approach, which explains more naturally its value than that based on quantum vacuum energy, in the form of topological invariants characteristic classes, included as Lagrange multipliers in the action. The approach draws from topological as well as dynamical system consideration, generating as a byproduct an effective cosmological constant. General Relativity is recovered by canceling the torsion in a region containing the observable Universe, which boundary constraints the invariants, thus yielding the effective cosmological constant's form. As that form's denominator contains the total volume of the average black hole, calculated from a geometrical mean on the estimated black hole mass distribution and directly associated to the ratio of the total volume boundary of the space-time manifold and the dominant term in its Euler characteristic. The constant's small estimated value compared to the Planck scale is therefore natural and our evaluation fits remarkably well with the observed value. Departamento de Ciencias Físicas Facultad de Ingenieriá Ciencias y Administración Universidad de la Frontera, Avda. Francisco Salazar 01145 Institute of Theoretical Physics School of Physical Science and Technology Lanzhou University, No. 222, South Tianshui Road Instituto de Astrofísica e Ciências Do Espaço Universidade de Lisboa Faculdade de Ciências, Ed. C8, Campo Grande Instituto de Física Teórica Universidade Estadual de Saõ Paulo (IFT-UNESP), Rua Dr. Bento Teobaldo Ferraz 271, Bloco 2, Barra Funda Instituto de Física Teórica Universidade Estadual de Saõ Paulo (IFT-UNESP), Rua Dr. Bento Teobaldo Ferraz 271, Bloco 2, Barra Funda