However, standard model of cosmology consider that almost 25% of the universe consists of dark matter and 70% of are motivated from string theory, but requires extra dark matter to explain the observational data another a recent analysis of a sample of 93 spectra of 86 low-metalicity extragalactic. 91 7 effective field theory for dark energy and modified gravity 93 71 the effective field theory action and its formulation 94 711 the background equations 96 72 quintessence and f(r) models mapping 97 73 a background dynamical analysis 98. When computing the mass-energy content of the universe, it becomes clear that an enormous amount of other types of matter (different from the ordinary baryonic matter) is needed to agree with standard cosmological models two types of matter are required to agree with the theories: dark matter and dark. This paper presents a basis of the theory of universe dark energy, a solution of einstein's cosmological constant problem, physical interpretation of unive. Ludwig-maximilians-universität sigillum universitatis ludovici maximiliani interactions between dark energy and dark matter dissertation der fakultät für subjects: theoretical cosmology - dark energy - dark matter - structure formation z = 0, coming from the analysis of supernovae ia, cmb anisotropies , and. Many scientists have also pointed out that the known properties of dark energy are consistent with a cosmological constant, a mathematical band-aid that albert einstein added to his theory of general relativity to make his equations fit with the notion of a static universe according to einstein, the constant would be a. Rather than comparing the standard λcdm cosmological model with an empty universe, the new study compares the fit of supernova data in λcdm to a different model, called the 'timescape cosmology' this has no dark energy instead, clocks carried by observers in galaxies differ from the clock that best. We examine the effects of possible phenomenological interactions between dark energy and dark matter on cosmological parameters and their efficiency in from the sloan digital sky survey, we perform a statistical joint analysis of different forms of phenomenological interaction between dark energy and dark matter.
Phase space analysis of interacting dark energy in (t) cosmology matter action is modified include the bulk viscous stress [35–37] and the anisotropic stress  or some exotic fluid like chaplygin gas (cg)  one of the crucial tests to check the viability of extended theories of gravity is the potential detection of. We perform a detailed dynamical analysis of the teleparallel dark energy scenario, which is based on the the interesting cosmological behavior of teleparallel dark energy makes it necessary to perform a phase-space and same as those of general relativity for every geometry choice, and that is why the theory is. Particle cosmology and gravitational theories group, division of human support system, faculty of symbiotic systems science, fukushima university, fukushima 960-1296, japan website | e-mail phone: +81-24-503-3263 fax: + 81-24-598-3187 interests: modified theories of gravity dark energy cosmology.
The bispectrum analysis of the baryon oscillation spectroscopic survey (boss) galaxies shows instead that these are highly biased tracers with a complex relation to the dark matter distribution i have used galaxy surveys data (2df and sdss) in combination with other data sets to constrain cosmological parameters. In physical cosmology and astronomy, dark energy is an unknown form of energy which is hypothesized to permeate all of space, tending to accelerate the expansion of the universe dark energy is the most accepted hypothesis to explain the observations since the 1990s indicating that the universe is expanding at an.
Key words: methods: data analysis – methods: numerical – cosmology: theory – dark energy – large-scale structure of universe 1 introduction one of today's greatest puzzles is that of the nature of the dark components of our universe: dark matter (dm) and dark energy (de) according to concordance cosmology. We still can't see the dark matter thought to make up about a quarter of the universe, but at least now we have a map of its structure given such a pristine view of the early universe, we were able to throw that into theoretical calculations and computer simulations to predict what the universe should look. Date: september 13, 2017 source: royal astronomical society summary: the accelerating expansion of the universe may not be real, but could just be an apparent the previous debate pitted the standard lambda cold dark matter ( λcdm) cosmology against an empty universe whose expansion neither accelerates. A central element of the standard cosmological theory is cold dark matter, which exerts gravity but does not emit light dark matter is smoothly distributed in the early universe, but over time gravity pulls it into filaments and clumps and empties out the spaces between them galaxies form when hydrogen and.
Supernovae analysis finds scant evidence for dark energy 21 oct 2016 hamish johnston indeed, the accelerating expansion of the universe has become a pillar of the most popular theory of cosmology, λcdm, where λ is the cosmological constant that describes the acceleration hundreds of other type 1a supernovae. The planck collaboration, contributing to data analysis and coordinating the scientific interpretation in the context of inflation, and being heavily involved in cosmological parameters, primordial magnetic fields, isotropy and statistics, dark energy studies development of theoretical models and data analysis tools in the context.
Cosmological analysis of dynamical chern-simons modified gravity via dark energy scenario different setups have been adopted, dynamical de models, modified and higher dimensional gravity theories, and effective description of the models and gravity theories, in order to illustrate its unknown. In this review we consider in detail different theoretical topics associated with interaction in the dark sector we study linear and nonlinear interactions which depend on the dark matter and dark energy densities we consider a number of different models (including the holographic dark energy and dark energy in a fractal. That it involves two unknown ingredients (dark matter and λ), and given the lack of theoretical motivation for the value  and  presented the first measurements and cosmological interpretation of rsd cosmological constraints that are comparable to those from cosmic shear analysis in the absence of systematics. We consider a cosmology in which dark matter and a quintessence scalar field responsible for the acceleration of the universe are allowed to interact allowing for both conformal and disformal couplings, we perform a global analysis of the constraints on our model using hubble parameter measurements,.