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Constraining unified dark matter models with weak lensing
Author(s) -
Camera S.
Publication year - 2010
Publication title -
annalen der physik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.009
H-Index - 68
eISSN - 1521-3889
pISSN - 0003-3804
DOI - 10.1002/andp.201010439
Subject(s) - physics , quintessence , barotropic fluid , dynamical systems theory , dark energy , linearization , scalar field , a priori and a posteriori , dark matter , scalar (mathematics) , cosmology , dynamical system (definition) , theoretical physics , universe , classical mechanics , statistical physics , astrophysics , nonlinear system , quantum mechanics , mathematics , geometry , philosophy , epistemology , mechanics
Unified Dark Matter (UDM) models provide an intriguing alternative to Dark Matter (DM) and Dark Energy (DE) through only one exotic component, i.e. a classical scalar field φ(t, x ). Thanks to a non–canonical kinetic term, this scalar field can mimic both the behaviour of the matter–dominated era at earlier times, as DM do, and the outcoming late–time acceleration, as a cosmological constant DE. Thus, it has been shown that these models can reproduce the same expansion history of the ΛCDM concordance model. In this work I review the first prediction of a physical observable, the power spectrum of the weak lensing cosmic convergence (shear). I present the weak lensing signal as predicted by the standard ΛCDM model and by a family of viable UDM models parameterized by the late–time sound speed c ∞ of the scalar field.last–scattering surface and a series of background galaxies peaked at different redshifts and spread over different redshifts as described by a functional form of their distribution of sources.