2018/10/10 by Christian Henke, Henke, Christian
Physics and Astronomy · #Astrophysics #Cosmological constant #Cosmology #Cosmology and Gravitation Theories #Dark Matter and Cosmic Phenomena #Dark energy #FOS: Physical sciences #General Physics (physics.gen-ph) #Horizon #Inflation (cosmology) #Lambda #Mathematical physics #Metric expansion of space #Particle physics #Physics #Quantum mechanics #Relativity and Gravitational Theory #Scalar field #Scale factor (cosmology) #Theoretical physics #physics.gen-ph
paper · pdf · doi:10.48550/arxiv.1810.05519
openalex publication_date 2018/10/10 · arxiv created 2020/01/20 · arxiv updated 2020/01/22 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
The present work deals with the cosmological consequences of the variable cosmological term Λ(a)=Λ0 + Λ1 a-r + Λ2 a-s, where a is the scale factor of the Robertson-Walker space-time. An analysis of the parameters Λ1,Λ2,r,s and α, which describes the interaction between the cosmological constant and non-relativistic matter/radiation, leads to an attractive density ρdm ∼ a-r and a repulsive density ρinfl ∼ a-s. As already known from literature, an approach of the form Λ(a)=Λ0 + Λ1 a-r and the identification of the energy density of space-time expansion with the zero-point density can avoid the scale discrepancy of the cosmological constant problem and solve the missing mass problem of dark matter. Furthermore, this works demonstrates that the additional term Λ2 a-s solves the flatness, the horizon and the magnetic-monopole problem without a hypothetical scalar field, which avoids speculations about the origin of this field. As a consequence, the imaginary time concept from Hartle and Hawking appears naturally.