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- W2282901413 abstract "The acceleration of the expansion of the universe is now a well demonstrated feature of the universe which is almost impossible to bypassed. This leads to a very surprising question: why is repulsive on large scales. By now, it is fair to say that we have no hint about the very reason for the origin of this phenomena (named hereafter energy) which can be regarded as one of the major surprises in modern physics. Tightening down the properties of dark energy is therefore a major objective of modern science in order to clarify its very nature. The simplest model of dark energy is a cosmological constant, as introduced by Einstein, equivalent to a (quantum) vacuum contribution to the energy budget of the universe. Alternative options are on one side the existence of a scalar field minimally coupled, named quintessence or with more complexity and on the other side the possibility that is actually not driven by general relativity (GR) but by some modified gravity , which behaves like GR on small scales, but would be different on large scale. Possible test of such theories relies mainly on the behavior of on large scale, beyond galactic scale. These scales are precisely the target of ongoing project dedicated to dark energy investigation like the ESA space mission EUCLID. Several probes used in combination will allow to constrain dark energy properties with a high accuracy. 1 Introduction: the remarkable successes of the ACDM picture The evidence for an accelerated expansion of the universe coming from the Hubble diagram of type I SN a has gained in robustness with accurate measurements of the fluctuations of the CMB by WMAP, now well reinforced by Planck, and the measurement of the correlation function on large scale by the Sloan telescope : not only the amplitude of the correlation function but also the specific pattern imprinted by the physics of the photon-baryon fluid at recombination time are measured. Both were predicted by ACDM picture, with almost no free parameters (except the bias between galaxies and matter) but are the characteristics are almost impossible to reproduce in alternative standard FLRW universes." @default.
- W2282901413 created "2016-06-24" @default.
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- W2282901413 date "2015-01-01" @default.
- W2282901413 modified "2023-09-27" @default.
- W2282901413 title "Investigating Dark Energy And Gravitation At Cosmological Scales With Euclid" @default.
- W2282901413 hasPublicationYear "2015" @default.
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