Bianchi Type I model of universe with customized scale factors
arXiv:2203.00385 · doi:10.1142/S0217732322501346
Abstract
According to standard cosmology, the universe is homogeneous and isotropic at large scales. However, some anisotropies can be observed at the local scale in the universe through various ways. Here we have studied the Bianchi type I model with customizing the scale factors to understand the anisotropic nature of the universe. We have considered two cases with slight modifications of scale factors in different directions in the generalized Bianchi Type I metric equation, and compared the results with the CDM model and also with available cosmological observational data. Through this study, we also want to predict the possible degree of anisotropy present in the early universe and its evolution to current time by calculating the value of density parameter for anisotropy () for both low and high redshift (z) along with the possible relative anisotropy that exist among different directions. It is found that there was a significant amount of anisotropy in the early universe and the anisotropic nature of the universe vanishes at the near past and the present epochs. Thus at near past and present stages of the universe there is no effective distinction between this anisotropic model and the standard CDM model.
arXiv comment18 pages, 10 figures
References in corpus (57)
- Dynamics of dark energy
- The clustering of galaxies in the completed SDSS-III Baryon Oscillation Spectroscopic Survey: cosmological analysis of the DR12 galaxy sample
- Modified Gravity Theories on a Nutshell: Inflation, Bounce and Late-time Evolution
- Dark energy cosmology: the equivalent description via different theoretical models and cosmography tests
- Dark Energy and the Accelerating Universe
- The Hubble Space Telescope Cluster Supernova Survey: V. Improving the Dark Energy Constraints Above z>1 and Building an Early-Type-Hosted Supernova Sample
- Constraints on the redshift dependence of the dark energy potential
- A 6% measurement of the Hubble parameter at : direct evidence of the epoch of cosmic re-acceleration
- Cosmic Chronometers: Constraining the Equation of State of Dark Energy. I: H(z) Measurements
- Raising the bar: new constraints on the Hubble parameter with cosmic chronometers at z2
- Improved constraints on the expansion rate of the Universe up to z~1.1 from the spectroscopic evolution of cosmic chronometers
- The WiggleZ Dark Energy Survey: Joint measurements of the expansion and growth history at z < 1
- Baryon Acoustic Oscillations in the Lyα forest of BOSS DR11 quasars
- Asymmetries in the CMB anisotropy field
- Clustering of Luminous Red Galaxies IV: Baryon Acoustic Peak in the Line-of-Sight Direction and a Direct Measurement of H(z)
- The significance of the largest scale CMB fluctuations in WMAP
- Age-dating Luminous Red Galaxies observed with the Southern African Large Telescope
- Quasar-Lyman Forest Cross-Correlation from BOSS DR11 : Baryon Acoustic Oscillations
- Detection of non-Gaussianity in the WMAP 1-year data using spherical wavelets
- Indications of a spatial variation of the fine structure constant
- Inflationary Universe with Anisotropic Hair
- Consistently Large Cosmic Flows on Scales of 100 Mpc/h: a Challenge for the Standard LCDM Cosmology
- Vector Inflation
- Testing the cosmological principle of isotropy: local power spectrum estimates of the WMAP data
- A measurement of large-scale peculiar velocities of clusters of galaxies: results and cosmological implications
- Multipole Vectors--a new representation of the CMB sky and evidence for statistical anisotropy or non-Gaussianity at 2<=l<=8
- Cosmic homogeneity demonstrated with luminous red galaxies
- Increasing evidence for hemispherical power asymmetry in the five-year WMAP data
- Spatial variation in the fine-structure constant -- new results from VLT/UVES
- The Clustering of Galaxies in the SDSS-III DR9 Baryon Oscillation Spectroscopic Survey: Testing Deviations from and General Relativity using anisotropic clustering of galaxies
- Measuring D_A and H at z=0.35 from the SDSS DR7 LRGs using baryon acoustic oscillations
- The WiggleZ Dark Energy Survey: the transition to large-scale cosmic homogeneity
- Cosmological Limits on Slightly Skew Stresses
- Evidence for anisotropy of cosmic acceleration
- A new measurement of the bulk flow of X-ray luminous clusters of galaxies
- Cosmic Microwave Background Quadrupole and Ellipsoidal Universe
- Cosmic Flows on 100 Mpc/h Scales: Standardized Minimum Variance Bulk Flow, Shear and Octupole Moments
- Ellipsoidal Universe Can Solve The CMB Quadrupole Problem
- Cosmic flow from 2MASS redshift survey: The origin of CMB dipole and implications for LCDM cosmology
- Searching for a Cosmological Preferred Axis: Union2 Data Analysis and Comparison with Other Probes
- Anisotropic Inflation from Vector Impurity
- Power of Observational Hubble Parameter Data: a Figure of Merit Exploration
- How Anisotropic is our Universe?
- Constraints on a Bianchi type I spacetime extension of the standard CDM model
- Is there Correlation between Fine Structure and Dark Energy Cosmic Dipoles?
- Testing the Isotropy of the Universe with Type Ia Supernovae
- Probing the anisotropic expansion from supernovae and GRBs in a model-independent way
- CMB Maximum Temperature Asymmetry Axis: Alignment with Other Cosmic Asymmetries
- The eccentric universe
- Asymmetric inflation: exact solutions
- Testing the isotropy of the Universe with type Ia supernovae in a model-independent way
- Tilted Physics: A Cosmologically Dipole-Modulated Sky
- Power Asymmetries in the Cosmic Microwave Background Temperature and Polarization patterns
- Isotropy of low redshift type Ia Supernovae: A Bayesian analysis
- Scalarons mimicking Dark Matter in the Hu-Sawicki model of f(R) gravity
- Cosmology with a new f(R) gravity model in Palatini formalism
- Updated constraints on spatial variations of the fine-structure constant