Search Publications
Probing a steep EoS for dark energy with latest observations
Jaber, Mariana; Macorra, Axel de la
We present a parametrization for the Dark Energy Equation of State "EoS" which has a rich structure, performing a transition at pivotal redshift zT between the present day value w0 to an early time wi =wa +w0 ≡ w(z ≫ 0) with a steepness given in terms of q parameter. The proposed parametrizati…
On the concordance of cosmological data in the case of the generalized Chaplygin gas
Aurich, R.; Lustig, S.
The generalized Chaplygin gas cosmology provides a prime example for the class of unified dark matter models, which substitute the two dark components of the standard cosmological ΛCDM concordance model by a single dark component. The equation of state of the generalized Chaplygin gas is characterised by a parameter α such that the standard ΛCDM m…
Neutrino physics from the cosmic microwave background and large scale structure
Hu, W.; Bond, J. R.; Borrill, J. +74 more
This is a report on the status and prospects of the quantification of neutrino properties through the cosmological neutrino background for the Cosmic Frontier of the Division of Particles and Fields Community Summer Study long-term planning exercise. Experiments planned and underway are prepared to study the cosmological neutrino background in det…
Growth of cosmic structure: Probing dark energy beyond expansion
Mandelbaum, Rachel; Sehgal, Neelima; Connolly, Andrew +18 more
The quantity and quality of cosmic structure observations have greatly accelerated in recent years, and further leaps forward will be facilitated by imminent projects. These will enable us to map the evolution of dark and baryonic matter density fluctuations over cosmic history. The way that these fluctuations vary over space and time is sensitive…
Inflation physics from the cosmic microwave background and large scale structure
Hu, W.; Bond, J. R.; Borrill, J. +91 more
Fluctuations in the intensity and polarization of the cosmic microwave background (CMB) and the large-scale distribution of matter in the universe each contain clues about the nature of the earliest moments of time. The next generation of CMB and large-scale structure (LSS) experiments are poised to test the leading paradigm for these earliest mom…
Cosmological constraints on galaxy cluster structure
Alcaniz, J. S.; Holanda, R. F. L.
Observations of galaxy clusters (GC's) are a powerful tool to probe the evolution of the Universe at z < 2 . However, the real shape and structure of these objects are not completely understood and the assumption of asphericity is often used in several cosmological tests. In this work, we propose methods to infer the elongation of the gas distr…
Exploiting cross correlations and joint analyses
Doré, O.; Honscheid, K.; Linder, E. +13 more
The nature of the dark energy thought to be causing the accelerating expansion of the Universe is one of the most compelling questions in all of science. Any of the explanations for the accelerated expansion, whether a new field, a negative pressure fluid, or a modification to General Relativity will signal new physics and have a profound effect o…