- Published on 19 May 2020
The idea of a cosmological constant which produces an accelerated universe has seen many ups and downs ever since it was introduced and then disowned by Einstein. A firm evidence of that our universe is accelerating came from the Luminosity vs redshift measurement of Type-I supernova by Riess eta al and Perlmutter et al in 1999 a discovery which earned them a Nobel prize in 2011. The recent examinations of supernova data however shows that not all is well with the standard LambdaCDM model of cosmology. The supernova evidence indicates that the cosmic acceleration is not isotropic which raises questions on our standard cosmological models that the universe is described by the Friedmann-Lemaitre-Robertson-Walker metric with small perturbations which were generated in a earlier epoch of accelerated expansion called Inflation. Apart from the supernova data the examination of data from large scale galaxy distribution and cosmic microwave anisotropy observations show that there are problems with the six-parameter ΛCDM model. The amplitude of the matter mower spectrum determined by the parameter called σ8 and Hubble expansion rate H0 show discrepancies between the determination from LSS observations and their determination from CMB. The resolution of these discrepancies my lie in the evolution of dark energy in time which then requires a well motivated model.
This EPJST issue will aim at surveying the evidence for dark energy from the latest supernovae data as well as data from CMB and LSS. The dark energy models lay open a long standing series of theoretical problems like why the vacuum fluctuations predicted from particle physics models are smaller than the observed cosmological constant by 120 orders of magnitude and the “why now” problem - why is the constant vacuum energy of similar magnitude as the matter density which changed rapidly throughout the past history of the universe. In this EPJST issue there will be contributions which survey the theories of dark energy from quantum field theory, modified gravity to supergravity and string theory. This EPJST issue will survey the recent results from observational cosmology and theoretical ideas of which aim to explain these observations.
The Guest Editors invite authors to submit their original research and short reviews on the theme of this special issue. Articles can have the following four different formats: Minireview (10-15 pages), Tutorial Review: (15+ pages), and Original Papers (typical, 5-10 pages) or (short, 3-5 pages), for further information see Instructions for Authors. Manuscripts should be prepared using the latex template of EPJ ST, which can be downloaded here. Articles should be submitted to the Editorial Office of EPJ ST via the submission system at https://articlestatus.edpsciences.org/is/epjst/home.php by selecting "The Accelerating Universe – Evidence and Theories".
Submission Deadline: 30 November 2020
We are looking forward to your contributions.