Consistency of LCDM with Geometric and Dynamical Probes

  title={Consistency of LCDM with Geometric and Dynamical Probes},
  author={Leandros Perivolaropoulos},
  journal={arXiv: Cosmology and Nongalactic Astrophysics},
  • L. Perivolaropoulos
  • Published 16 February 2010
  • Physics
  • arXiv: Cosmology and Nongalactic Astrophysics
The LCDM cosmological model assumes the existence of a small cosmological constant in order to explain the observed accelerating cosmic expansion. Despite the dramatic improvement of the quality of cosmological data during the last decade it remains the simplest model that fits remarkably well (almost) all cosmological observations. In this talk I review the increasingly successful fits provided by LCDM on recent geometric probe data of the cosmic expansion. I also briefly discuss some emerging… Expand

Figures and Tables from this paper

Scale-dependent perturbations finally detectable by future galaxy surveys and their contribution to cosmological model selection
By means of the present geometrical and dynamical observational data, it is very hard to establish, from a statistical perspective, a clear preference among the vast majority of the proposed modelsExpand
Observational constraints on dark energy cosmological model parameters
The expansion rate of the Universe changes with time, initially slowing (decelerating) when the universe was matter dominated, because of the mutual gravitational attraction of all the matter in it,Expand
Testing scale-dependent perturbations in ΛCDM with future galaxy surveys
Abstract The quest for the origin of the present accelerated expansion of the Universe is still open. By means of the present geometrical and dynamical observational data, it is very hard toExpand
Dynamical dark energy models with singularities in the view of the forthcoming results of the growth observations
The question of the origin of the recent acceleration of the Universes expansion is still pending. What is making the situation even worst, it is impossible to distinguish the vast majority of theExpand
Cosmic perturbations with running G and Λ
Cosmologies with running cosmological term ρΛ and gravitational Newton's coupling G may naturally be expected if the evolution of the universe can ultimately be derived from the first principles ofExpand
Probing the primordial Universe using the SKA in combination with other cosmological surveys
Faculty of Natural Science Department of Physics and Astronomy Master of Science by William Matthewson Next-generation surveys of the large-scale structure of the Universe will be of great importanceExpand
QCD-scale modified-gravity universe
Abstract A possible gluon-condensate-induced modified-gravity model with f ( R ) ∝ ∣ R ∣ 1/2 has been suggested previously. Here, a simplified version is presented using the constant flat-spacetimeExpand
Exploring hints for dark energy density evolution in light of recent data
Abstract Considering a quadratic parameterization of the dark energy density, we explore signatures of evolution using data from gas mass fraction in clusters, type Ia supernova, BAO and CMB. We findExpand
Intermediate evolution using SNIa, and BAO
We study the intermediate evolution model and show that, compared with the recent study of a power-law evolution, the intermediate evolution is a better description of the low-redshift regimeExpand
Asymmetry in the reconstructed deceleration parameter
Abstract We study the orientation dependence of the reconstructed deceleration parameter as a function of redshift. We use the Union 2 and Loss datasets, and the well known preferred axis discussedExpand


Scrutinizing Exotic Cosmological Models Using ESSENCE Supernova Data Combined with Other Cosmological Probes
The first cosmological results from the ESSENCE supernova survey (Wood-Vasey and coworkers) are extended to a wider range of cosmological models including dynamical dark energy and nonstandardExpand
Cosmological constant—the weight of the vacuum
Recent cosmological observations suggest the existence ofa positive cosmological constantwith the magnitude � (G˝=c 3 ) ≈ 10 −123 . This review discusses several aspects ofthe cosmological constantExpand
A Measurement of Large-Scale Peculiar Velocities of Clusters of Galaxies: Results and Cosmological Implications
Peculiar velocities of clusters of galaxies can be measured by studying the fluctuations in the cosmic microwave background (CMB) generated by the scattering of the microwave photons by the hotExpand
The cosmological constant problem and quintessence
I briefly review the cosmological constant problem and the issue of dark energy (or quintessence). Within the framework of quantum field theory, the vacuum expectation value of the energy momentumExpand
New perspective on galaxy clustering as a cosmological probe: General relativistic effects
We present a general relativistic description of galaxy clustering in a Friedmann-Lemaitre-Robertson-Walker universe. The observed redshift and position of galaxies are affected by the matterExpand
Weak Lensing and Cosmology
We explore the dependence of weak lensing phenomena on the background cosmology. We first generalize the relation between Pψ(ω), the angular power spectrum of the distortion, and the power spectrumExpand
Dynamics of dark energy
We review in detail a number of approaches that have been adopted to try and explain the remarkable observation of our accelerating universe. In particular we discuss the arguments for and recentExpand
Probing Dark Energy with Baryonic Acoustic Oscillations from Future Large Galaxy Redshift Surveys
We show that the measurement of the baryonic acoustic oscillations in large high-redshift galaxy surveys offers a precision route to the measurement of dark energy. The cosmic microwave backgroundExpand
The emptiness of voids: yet another overabundance problem for the Λ cold dark matter model
We study the luminosity function, the peculiar velocities and the sizes of voids in the Local Volume (LV) in observational samples of galaxies which contain galaxies down to M B = ― 10 and to M B =Expand
Six Puzzles for LCDM Cosmology
Department of Physics, University of Ioannina, Greece(Dated: December 22, 2008)The ΛCDM cosmological model is a well defined, simple and predictive model which is consistentwith the majority ofExpand