Explaining low l anomalies in the CMB power spectrum with resonant superstring excitations during inflation

Abstract

We explore the possibility that both the suppression of the $\ell =2$ multipole moment of the power spectrum of cosmic microwave background temperature fluctuations and the possible dip for $\ell =10-30$ can be explained as well as a possible new dip for $\ell \approx 60$ as the result of the resonant creation of sequential excitations of a fermionic (or bosonic) closed superstring that couples to the inflaton field. We consider a D=26 closed bosonic string with one toroidal compact dimension as an illustration of how string excitations might imprint themselves on the CMB. We analyze the existence of successive momentum states, winding states or oscillations on the string as the source of the three possible dips in the power spectrum. Although the evidence of these dips are of marginal statistical significance, this might constitute the first observational evidence of successive superstring excitations in Nature.

10 pages, 5 figures Published in EPJC, version matches published version, triangle plot colour version available in the journal published version

References in corpus (24)

• Monodromy in the CMB: Gravity Waves and String Inflation
• Polarization Observations with the Cosmic Background Imager
• Cosmic Microwave Background Quadrupole and Ellipsoidal Universe
• Ellipsoidal Universe Can Solve The CMB Quadrupole Problem
• Cosmological Fluctuations from Infra-Red Cascading During Inflation
• Effects of particle production during inflation
• The pre-inflationary vacuum in the cosmic microwave background
• Black Hole Remnants in the Early Universe
• Wiggly Whipped Inflation
• Just enough inflation: power spectrum modifications at large scales
• CMB quadrupole suppression: I. Initial conditions of inflationary perturbations
• Effects of a pre-inflation radiation-dominated epoch to CMB anisotropy
• Cosmic Microwave Background constraints for global strings and global monopoles
• Irruption of massive particle species during inflation
• Inflation, String Theory and Cosmology
• Cosmological Avatars of the Landscape II: CMB and LSS Signatures
• Hemispherical Power Asymmetry from a Space-Dependent Component of the Adiabatic Power Spectrum
• Joint Planck and WMAP Assessment of Low CMB Multipoles
• Revisiting a pre-inflationary radiation era and its effect on the CMB power spectrum
• Multi-Scale Pipeline for the Search of String-Induced CMB Anisotropies
• Power Spectrum of Inflationary Attractors
• Confronting Kähler moduli inflation with CMB data
• Physical effects of massless cosmic strings
• Negative Running of the Spectral Index, Hemispherical Asymmetry and the Consistency of Planck with Large $r$

Cited by in corpus (6)

• A paradigm of warm quintessential inflation and production of relic gravity waves
• Production of Primordial Black Holes via Single Field Inflation and Observational Constraints
• Study in the noncanonical domain of Goldstone inflation
• The LSPE-Strip feed horn array
• Impact of Low ell's on Large Scale Structure Anomalies
• Rescuing Palindromic Universes with Improved Recombination Modelling