Effects of cosmic strings with delayed scaling on CMB anisotropy

Abstract

The network of cosmic strings generated in a phase transition during inflation enters the scaling regime later than that of usual strings. If it occurs after the recombination, temperature anisotropies of the cosmic microwave background (CMB) at high multipole moments are significantly reduced. In this paper, we study such effects qualitatively and show that the constraint on the cosmic string tension from the CMB temperature anisotropies and B-mode polarizations can be relaxed. It is shown to be difficult to explain the recent BICEP2 and POLARBEAR results in terms of signals induced by cosmic strings alone even if we take into account the delayed scaling. However, the inflationary tensor-to-scalar ratio required to explain the observed B-mode signals can be slightly reduced to be consistent with the Planck constraint.

arXiv comment9 pages, 7 figures; v2: comments and references added, matches version published in PRD

References in corpus (17)

• Nine-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Parameter Results
• Efficient Computation of CMB anisotropies in closed FRW models
• BICEP2 I: Detection Of B-mode Polarization at Degree Angular Scales
• Cosmic strings
• CMB Anisotropies: Total Angular Momentum Method
• Quantitative String Evolution
• Extending the Velocity-dependent One-scale String Evolution Model
• Cosmic microwave background anisotropy from wiggly strings
• The case against scaling defect models of cosmic structure formation
• CMB power spectra from cosmic strings: predictions for the Planck satellite and beyond
• Polarization of the Microwave Background in Defect Models
• Did BICEP2 see vector modes? First B-mode constraints on cosmic defects
• Can topological defects mimic the BICEP2 B-mode signal?
• Moduli Inflation with Large Scale Structure Produced by Topological Defects
• Chaotic inflation in supergravity and cosmic string production
• Evading the pulsar constraints on the cosmic string tension in supergravity inflation
• Phase transition and monopole production in supergravity inflation

Cited by in corpus (10)

• Exploring Cosmic Origins with CORE: Inflation
• Gravitational Wave Bursts as Harbingers of Cosmic Strings Diluted by Inflation
• Signature of inflation in the stochastic gravitational wave background generated by cosmic string networks
• Constraining topological defects with temperature and polarization anisotropies
• Non-Gaussian Structure of B-mode Polarization after Delensing
• Large scale CMB anomalies from thawing cosmic strings
• Stochastic gravitational waves from long cosmic strings
• Interferences in the Stochastic Gravitational Wave Background
• Complementary signatures of $\alpha -$attractor inflation in CMB and cosmic string Gravitational Waves
• Lumpy cosmic strings