A copy of this work was available on the public web and has been preserved in the Wayback Machine. The capture dates from 2018; you can also visit the original URL.
The file type is
"Expansion" around the vacuum: how far can we go from Λ?
Astronomy and Astrophysics
The cosmological constant (Λ), i.e., the energy density stored in the true vacuum state of all existing fields in the Universe, is the simplest and the most natural possibility to describe the current cosmic acceleration. However, despite its observational successes, such a possibility exacerbates the well known Λ problem, requiring a natural explanation for its small, but nonzero, value. In this paper we discuss how different our Universe may be from the ΛCDM model by studying observationaldoi:10.1051/0004-6361:20065656 fatcat:mkurhtcvkbhxvmgn2u6ok7b7je