2009/09/30 by F. Bauer, Florian Bauer
Physics and Astronomy · #Black Holes and Theoretical Physics #Classical mechanics #Constant (computer programming) #Cosmological constant #Cosmology #Cosmology and Gravitation Theories #Dark energy #Mathematical physics #Mechanism (biology) #Physics #Quantum mechanics #Quintessence #Relativity and Gravitational Theory #Relaxation (psychology) #Theoretical physics #astro-ph.CO #gr-qc #hep-ph #hep-th
paper · pdf · doi:10.1088/0264-9381/27/5/055001
published as Class.Quant.Grav.27:055001,2010 · 18 pages, LaTeX; discussion improved, accepted by CQG
arxiv created 2010/01/12 · openalex publication_date 2010/02/10 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
Recently, a mechanism for relaxing a large cosmological constant (CC) has been proposed by Bauer et al (2009 Phys. Lett. B 678 427), which permits solutions with low Hubble rates at late times without fine-tuning. The setup is implemented in the ΛXCDM framework, and we found a reasonable cosmological background evolution similar to the ΛCDM model with a fine-tuned CC. In this work, we analyse analytically the perturbations in this relaxation model, and we show that their evolution is also similar to the ΛCDM model, especially in the matter era. Some tracking properties of the vacuum energy are discussed, too.