Primordial anisotropies from cosmic strings during inflation

Abstract

In this work we study the imprints of a primordial cosmic string on inflationary power spectrum. Cosmic string induces two distinct contributions on curvature perturbations power spectrum. The first type of correction respects the translation invariance while violating isotropy. This generates quadrupolar statistical anisotropy in CMB maps which is constrained by the Planck data. The second contribution breaks both homogeneity and isotropy, generating a dipolar power asymmetry in variance of temperature fluctuations with its amplitude falling on small scales. We show that the strongest constraint on the tension of string is obtained from the quadrupolar anisotropy and argue that the mass scale of underlying theory responsible for the formation of string can not be much higher than the GUT scale. The predictions of string for the diagonal and off-diagonal components of CMB angular power spectrum are presented.

25 pages, 6 figures

References in corpus (32)

• Inflationary Universe with Anisotropic Hair
• Hemispherical power asymmetry in the three-year Wilkinson Microwave Anisotropy Probe sky maps
• The Nature of Primordial Fluctuations from Anisotropic Inflation
• A Hemispherical Power Asymmetry from Inflation
• Cosmic Microwave Background Statistics for a Direction-Dependent Primordial Power Spectrum
• Power asymmetry in WMAP and Planck temperature sky maps as measured by a local variance estimator
• Superhorizon Perturbations and the Cosmic Microwave Background
• A Scale-Dependent Power Asymmetry from Isocurvature Perturbations
• New CMB constraints for Abelian Higgs cosmic strings
• A re-analysis of the three-year WMAP temperature power spectrum and likelihood
• Non-isotropy in the CMB power spectrum in single field inflation
• The (p,q) String Tension in a Warped Deformed Conifold
• On the significance of power asymmetries in Planck CMB data at all scales
• Constraints on the Nambu-Goto cosmic string contribution to the CMB power spectrum in light of new temperature and polarisation data
• Constraining topological defects with temperature and polarization anisotropies
• Inflationary power asymmetry from primordial domain walls
• CMB Hemispherical Asymmetry: Long Mode Modulation and non-Gaussianity
• Polypolar spherical harmonic decomposition of galaxy correlators in redshift space: Toward testing cosmic rotational symmetry
• Inflation, String Theory and Cosmology
• Local variance asymmetries in Planck temperature anisotropy maps
• Hemispherical Power Asymmetry from a Space-Dependent Component of the Adiabatic Power Spectrum
• Expected dipole asymmetry in CMB polarization
• Generating the cosmic microwave background power asymmetry with $g_{NL}$
• A separate universe view of the asymmetric sky
• CMB hemispherical asymmetry from non-linear isocurvature perturbations
• Scalar cosmological perturbations from inflationary black holes
• Effective field theory of statistical anisotropies for primordial bispectrum and gravitational waves
• Strongly scale-dependent CMB dipolar asymmetry from super-curvature fluctuations
• Scale-dependent hemispherical asymmetry from general initial state during inflation
• Hemispherical asymmetry from an isotropy violating stochastic gravitational wave background
• Fingerprints of Anomalous Primordial Universe on the Abundance of Large Scale Structures
• Inflaton fluctuations in the presence of cosmological defects

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• Revisiting the large-scale CMB anomalies: The impact of the SZ signal from the Local Universe
• Bubble nucleation and inflationary perturbations
• Cosmic Microwave Background Dipole Asymmetry could be explained by Axion Monodromy Cosmic Strings
• CMB Polarization by the Asymmetric Template of Scalar Perturbations
• Evolution of superhorizon perturbations in early Universe with anisotropic solid remnant
• Solid matter with zero shear modulus in flat universe