Open AccessWMAP constraints on low redshift evolution of dark energy
Author(s) -
Jassal H. K.,
Bagla J. S.,
Padmanabhan T.
Publication year - 2005
Publication title -
monthly notices of the royal astronomical society: letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.067
H-Index - 122
eISSN - 1745-3933
pISSN - 1745-3925
DOI - 10.1111/j.1745-3933.2005.08577.x
Subject(s) - dark energy , cmb cold spot , physics , redshift , astrophysics , equation of state , cosmological constant , supernova , constant (computer programming) , lambda cdm model , observational cosmology , dark fluid , cosmology , theoretical physics , cosmic microwave background , quantum mechanics , galaxy , anisotropy , computer science , programming language
The conceptual difficulties associated with a cosmological constant have led to the investigation of alternative models in which the equation of state parameter, w = p /ρ , of the dark energy evolves with time. We show that combining the supernova type Ia observations with the constraints from WMAP observations restricts large variation of ρ( z ) at low redshifts. The combination of these two observational constraints is stronger than either one. The results are completely consistent with the cosmological constant as the source of dark energy.