Dark Energy: Nature and Robustness
نویسندگان
چکیده
منابع مشابه
Polarization Measures and Nature of Dark Energy
Polarization measures, on wide angular scales, together with anisotropy data, can fix DE parameters. Here we discuss the sensitivity needed to provide significant limits. Our analysis puts in evidence that a class of models predicts low correlation or anticorrelation between polarization and anisotropy at low l. This class includes open models and models with DE due to a Ratra–Peebles (RP) pote...
متن کاملNature of Dark Energy and Polarization Measurements
We discuss at which noise level measures of polarization on wide angular scales, together with anisotropy data, can fix DE parameters. Anisotropy–polarization correlations, at low l, for RP models, are peculiar and similar to open models. Using a likelihood analysis, we show then that it can be possible to distinguish models with DE due to RP potentials from ΛCDM and other quintessence models, ...
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The origin of the observed dark energy could be explained entirely within the standard model, with no new fields required. We show how the low-energy sector of the chiral QCD Lagrangian, once embedded in a nontrivial spacetime, gives rise to a cosmological vacuum energy density which can be can be presented entirely in terms of QCD parameters and the Hubble constant H as ρΛ ' H ·mq〈q̄q〉/mη′ ∼ (4...
متن کاملTracing the Nature of Dark Energy with Galaxy Distribution
Dynamical Dark Energy (DE) is a viable alternative to the cosmological constant. Yet, constructing tests to discriminate between Λ and dynamical DE models is difficult because the differences are not large. In this paper we explore tests based on the galaxy mass function, the void probability function (VPF), and the number of galaxy clusters. At high z the number density of clusters shows large...
متن کاملRevealing the Nature of Dark Energy Using Bayesian Evidence
We apply the Bayesian concept of ‘evidence’ to reveal systematically the nature of dark energy from present and future supernova luminosity distance measurements. We express the unknown dark energy equation of state w(z) as a low order polynomial in redshift and use evidence to find the polynomial order, thereby establishing the minimum order required by the data. We apply this method to the cu...
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ژورنال
عنوان ژورنال: International Astronomical Union Colloquium
سال: 2005
ISSN: 0252-9211
DOI: 10.1017/s0252921100009684