Rogues' gallery: the full freedom of the Bianchi CMB anomalies

Abstract

Combining a recent derivation of the CMB evolution equations for homogeneous but anisotropic (Bianchi) cosmologies with an account of the full linearized dynamical freedoms available in such models, I calculate and discuss the various temperature and polarisation anisotropy patterns which may be formed. Certain anisotropies can be hidden in superhorizon modes at early times, thus avoiding any constraints from nucleosynthesis while nevertheless producing non-trivial redshift-zero temperature patterns in flat and open universes. The results are likely to be more of pedagogical than observational interest, but future work will assess whether such patterns can be matched to anomalies in WMAP results.

arXiv commentSomewhat expanded version (7 pages, 3 figures) accepted for publication in PRD. No change in results. Movie at http://www.ast.cam.ac.uk/~app26/

References in corpus (21)

• Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Data Processing, Sky Maps, and Basic Results
• Three Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Polarization Analysis
• A New Calculation of the Recombination Epoch
• The axis of evil
• Evidence of vorticity and shear at large angular scales in the WMAP data: a violation of cosmological isotropy?
• The Uncorrelated Universe: Statistical Anisotropy and the Vanishing Angular Correlation Function in WMAP Years 1-3
• Cosmological Limits on Slightly Skew Stresses
• Ellipsoidal Universe Can Solve The CMB Quadrupole Problem
• Accelerating Cosmologies with an Anisotropic Equation of State
• Anisotropic Cosmological Constant and the CMB Quadrupole Anomaly
• CMB multipole measurements in the presence of foregrounds
• Cosmological models (Cargèse lectures 1998)
• Fast and Efficient Template Fitting of Deterministic Anisotropic Cosmological Models Applied to WMAP Data
• Bianchi Model CMB Polarization and its Implications for CMB Anomalies
• On the Viability of Bianchi Type VIIh Models with Dark Energy
• A dynamical systems approach to the tilted Bianchi models of solvable type
• Template fitting and the large-angle CMB anomalies
• Markov chain Monte Carlo analysis of Bianchi VII_h models
• Future Asymptotic Behaviour of Tilted Bianchi models of type IV and VIIh
• Possible extensions of the standard cosmological model: anisotropy, rotation, and magnetic field
• Geodesics in Open Universes

Cited by in corpus (25)

• Large-angle anomalies in the CMB
• Is the Observable Universe Consistent with the Cosmological Principle?
• How isotropic is the Universe?
• Anisotropic Universe Models in f(T) Gravity
• Planck 2013 results. XXVI. Background geometry and topology of the Universe
• Planck 2015 results. XVIII. Background geometry & topology
• Relativistic fluid dynamics: physics for many different scales
• A Model of Universe Anisotropization
• Anisotropic dark energy and ellipsoidal universe
• Cosmic Parallax in Ellipsoidal Universe
• Linearization of homogeneous, nearly-isotropic cosmological models
• Bayesian analysis of anisotropic cosmologies: Bianchi VII_h and WMAP
• Bipolar Harmonic encoding of CMB correlation patterns
• A framework for testing isotropy with the cosmic microwave background
• New Classes of Off-Diagonal Cosmological Solutions in Einstein Gravity
• Statistical Characterization of Temperature Patterns in Anisotropic Cosmologies
• Anisotropic universe with anisotropic dark energy
• Bianchi spacetimes as super-curvature modes around isotropic cosmologies
• Multi-fluid cosmology: An illustration of fundamental principles
• Modelling the emergence of cosmic anisotropy from non-linear structures
• Temperature and Polarization Patterns in Anisotropic Cosmologies
• Testing the anisotropy of the Universe with the distance duality relation
• Cosmological Attractors and Anisotropies in Two Measure Theories, Effective EYMH systems, and Off--Diagonal Inflation Models
• CMB line-of-sight integrators for nearly-isotropic cosmological models
• Origin & evolution of the Universe