Distances and lensing in cosmological void models

Abstract

We study the distances and gravitational lensing in spherically symmetric inhomogeneous cosmological models consisting of inner and outer homogeneous regions which are connected by a single shell or double shells at the redshift $z_1\sim 0.067$. The density and Hubble parameters in the inner region are assumed to be smaller and larger, respectively, than those in the outer region. It is found that at the stage $z_1<z<1.5$ the distances from an observer in the inner void-like region are larger than the counterparts (with equal $z$) in the corresponding homogeneous Friedmann models, and hence the magnitudes for the sources at this stage are larger. This effect of the void-like low-density region may explain the deviations of the observed [magnitude-redshift] relation of SNIa from the relation in homogeneous models, independently of the cosmological constant. When the position of the observer deviates from the center, moreover, it is shown that the distances are anisotropic and the images of remote sources are systematically deformed. The above relation at $z\ge 1.0$ and this anisotropy will observationally distinguish the role of the above void-like region from that of the positive cosmological constant. The influence on the time-delay measurement is also discussed.

14 pages, 11 postscript figures Equation numbers were corrected, Apj 529(2000) No.1 in press

References in corpus (10)

• Observational Evidence from Supernovae for an Accelerating Universe and a Cosmological Constant
• The High-Z Supernova Search: Measuring Cosmic Deceleration and Global Cur vature of the Universe Using Type Ia Supernovae
• Constraints on Cosmological Models from Hubble Space Telescope Observations of High-z Supernovae
• Type Ia Supernovae and the Hubble Constant
• A Local Hubble Bubble from SNe Ia?
• A Large-Scale Bulk Flow of Galaxy Clusters
• Peculiar Velocity Dipoles of Field Galaxies
• The LCO/Palomar 10,000 km/sec Cluster Survey. II. Constraints on Large-Scale Streaming
• Bulk flows and CMB dipole anisotropy in cosmological void models
• Seeking the Local Convergence Depth. The Abell Cluster Dipole Flow to 200 Mpc/h

Cited by in corpus (74)

• Cosmology and fundamental physics with the Euclid satellite
• Dark Energy
• Dark Energy from structure: a status report
• Does the growth of structure affect our dynamical models of the universe? The averaging, backreaction and fitting problems in cosmology
• A Local Void and the Accelerating Universe
• Evidence for a ~300 Mpc Scale Under-density in the Local Galaxy Distribution
• Inhomogeneous cosmological models: exact solutions and their applications
• Accelerated expansion from structure formation
• Is dark energy the only solution to the apparent acceleration of the present universe?
• "Swiss-Cheese" Inhomogeneous Cosmology & the Dark Energy Problem
• Dark goo: Bulk viscosity as an alternative to dark energy
• Observational constraints on inhomogeneous cosmological models without dark energy
• Correspondence between kinematical backreaction and scalar field cosmologies - the `morphon field'
• Testing the Void against Cosmological data: fitting CMB, BAO, SN and H0
• Precision cosmology defeats void models for acceleration
• Nonlinear Structure Formation and "Apparent" Acceleration: an Investigation
• Archipelagian Cosmology: Dynamics and Observables in a Universe with Discretized Matter Content
• Gravitational lens time delays for distant supernovae: break the degeneracy between radial mass profiles and the Hubble constant
• Analyses of Type Ia Supernova Data in Cosmological Models with a Local Void
• Szekeres Swiss-Cheese model and supernova observations
• Local Void vs Dark Energy: Confrontation with WMAP and Type Ia Supernovae
• The Effect of Large-Scale Inhomogeneities on the Luminosity Distance
• Perturbation Theory in Lemaitre-Tolman-Bondi Cosmology
• Light Propagation and Large-Scale Inhomogeneities
• Distinguishing Between Void Models and Dark Energy with Cosmic Parallax and Redshift Drift
• On globally static and stationary cosmologies with or without a cosmological constant and the Dark Energy problem
• Reconciling the local void with the CMB
• Redshift Drift in LTB Void Universes
• Observational constraints on the LLTB model
• Cosmological Acceleration and Gravitational Collapse
• Dark energy: investigation and modeling
• Tidal Dynamics in Cosmological Spacetimes
• Can decaying modes save void models for acceleration?
• Dynamics of coupled phantom and tachyon fields
• Complete solutions to the metric of spherically collapsing dust in an expanding spacetime with a cosmological constant
• What the small angle CMB really tells us about the curvature of the Universe
• CMB observations in LTB universes: Part I: Matching peak positions in the CMB spectrum
• Exact spherically-symmetric inhomogeneous model with n perfect fluids
• Perceiving the equation of state of Dark Energy while living in a Cold Spot
• CMB observations in LTB universes: Part II: the kSZ effect in an LTB universe
• Backreaction in Cosmology
• Euclid: Forecast constraints on consistency tests of the $\Lambda$CDM model
• Effects of voids on the reconstruction of the equation of state of Dark Energy
• Evolution of density perturbations in large void universe
• The effect of pressure gradients on luminosity distance - redshift relations
• The Lindquist-Wheeler formulation of lattice universes
• Structure and dynamics in low density regions: galaxy-galaxy correlations inside cosmic voids
• Regge calculus models of closed lattice universes
• Probing violation of the Copernican principle via the integrated Sachs-Wolfe effect
• Dipole anisotropies of IRAS galaxies and the contribution of a large-scale local void
• Observational cosmology using characteristic numerical relativity
• Averaged Lemaître-Tolman-Bondi dynamics
• Accelerated cosmic expansion in a scalar-field universe
• Luminous Matter Distribution, Bulk Flows and Baryon Contents in Cosmological Models with a Local Void
• Testing LTB Void Models Without the Cosmic Microwave Background or Large Scale Structure: New Constraints from Galaxy Ages
• Cosmology when living near the Great Attractor
• Blueshifts in the Lema\^ıtre -- Tolman models
• Constraints on Dark Energy state equation with varying pivoting redshift
• Observational Constraint on Spherical Inhomogeneity with CMB and Local Hubble Parameter
• Simple inhomogeneous cosmological (toy) models
• CMB sky for an off-center observer in a local void I: framework for forecasts
• Second-order power spectra of CMB anisotropies due to primordial random perturbations in flat cosmological models
• Gauge-invariant treatment of the integrated Sachs-Wolfe effect on general spherically symmetric spacetimes
• Isotropic Expansion of Inhomogeneous Universe
• Inverse Construction of the $\Lambda$LTB Model from a Distance-redshift Relation
• Probing extra dimensions through cosmological observations of dark energy
• Taylor expansion of luminosity distance in Szekeres cosmological models: Effects of local structures evolution on cosmographic parameters
• Two-point correlation function of density perturbations in a large void universe
• Voids as Alternatives to Dark Energy and the Propagation of Gamma Rays through the Universe
• Effect of inhomogeneity of the Universe on a gravitationally bound local system: A no-go result for explaining the secular increase in the astronomical unit
• Newtonian self-gravitating system in a relativistic huge void universe model
• Probing Time-Dependent Dark Energy with the Flux Power Spectrum of the Lyman $\alpha$ Forest
• Recovery of fluctuation spectrum evolution from tomographic shear spectra
• Cosmological Model with a Local Void: New Supernova Constraints