Signature of inflation in the stochastic gravitational wave background generated by cosmic string networks

Abstract

A cosmic string network created during an inflationary stage in the early Universe - here defined as i-string network - is expected to enter a transient stretching regime during inflation, in which its characteristic length is stretched to scales much larger than the Hubble radius, before attaining a standard evolution once the network re-enters the Hubble volume after inflation. During the stretching regime, the production of cosmic string loops and consequent emission of gravitational radiation are significantly suppressed. Here, we compute the power spectrum of the stochastic gravitational wave background generated by i-string networks using the velocity-dependent one scale model to describe the network dynamics, and demonstrate that this regime introduces a high-frequency signature on an otherwise standard spectrum of the stochastic gravitational wave background generated by cosmic strings. We argue that, if observed by current or forthcoming experiments, this signature would provide strong evidence for i-strings and, therefore, for (primordial) inflation. We also develop a simple single-parameter algorithm for the computation of the stochastic gravitational wave background generated by i-strings from that of a standard cosmic string network, which may be useful in the determination of the observational constraints to be obtained by current and forthcoming gravitational wave experiments.

arXiv comment13 pages, 9 figures

References in corpus (39)

• Planck 2015 results. XIII. Cosmological parameters
• GW170817: Observation of Gravitational Waves from a Binary Neutron Star Inspiral
• GW151226: Observation of Gravitational Waves from a 22-Solar-Mass Binary Black Hole Coalescence
• Hybrid Inflation
• The Temperature of the Cosmic Microwave Background
• Cosmological Backgrounds of Gravitational Waves
• Cosmic String Production Towards the End of Brane Inflation
• How generic is cosmic string formation in SUSY GUTs
• The number of cosmic string loops
• Quantitative String Evolution
• Cosmological evolution of cosmic string loops
• Extending the Velocity-dependent One-scale String Evolution Model
• The Production, Spectrum and Evolution of Cosmic Strings in Brane Inflation
• Large parallel cosmic string simulations: New results on loop production
• Fayet-Iliopoulos Terms in Supergravity and Cosmology
• Numerical simulations of string networks in the Abelian-Higgs model
• Scaling of cosmic string loops
• Constraints on cosmic string tension imposed by the limit on the stochastic gravitational wave background from the European Pulsar Timing Array
• Cosmic Archaeology with Gravitational Waves from Cosmic Strings
• Cosmic string loop distribution on all length scales and at any redshift
• Exact Scale-Invariant Background of Gravitational Waves from Cosmic Defects
• Cosmic string loops in the expanding universe
• Abelian Higgs Cosmic Strings: Small Scale Structure and Loops
• Scaling from gauge and scalar radiation in Abelian Higgs string networks
• Scaling and Small Scale Structure in Cosmic String Networks
• Stochastic Gravitational Wave Background generated by Cosmic String Networks: Velocity-Dependent One-Scale model versus Scale-Invariant Evolution
• $D$-term inflation, cosmic strings, and consistency with cosmic microwave background measurement
• A Nearly Scale Invariant Spectrum of Gravitational Radiation from Global Phase Transitions
• Probing Cosmic Superstrings with Gravitational Waves
• String Radiative Backreaction
• The cosmological evolution of p-brane networks
• p-brane dynamics in (N+1)-dimensional FRW universes: a unified framework
• The Stochastic Gravitational Wave Background Generated by Cosmic String Networks: the Small-Loop Regime
• Moduli Inflation with Large Scale Structure Produced by Topological Defects
• Scaling laws for weakly interacting cosmic (super)string and p-brane networks
• Large scale CMB anomalies from thawing cosmic strings
• Brane Inflation and Defect Formation
• Evading the pulsar constraints on the cosmic string tension in supergravity inflation
• Effects of cosmic strings with delayed scaling on CMB anisotropy

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• Gravitational Waves from Global Cosmic Strings and Cosmic Archaeology
• Gravitational waves and proton decay: complementary windows into GUTs
• Full analytical approximation to the stochastic gravitational wave background generated by cosmic string networks
• BSM with Cosmic Strings: Heavy, up to EeV mass, Unstable Particles
• Gravitational Wave Bursts as Harbingers of Cosmic Strings Diluted by Inflation
• Cosmic Strings, Inflation, and Gravity Waves
• Testing Super-Heavy Dark Matter from Primordial Black Holes with Gravitational Waves
• Baryon and Lepton Number Violation from Gravitational Waves
• Gravitational backreaction simulations of simple cosmic string loops
• Gravitational Waves from Quasi-stable Strings
• PBH-infused seesaw origin of matter and unique gravitational waves
• Testing Realistic $SO(10)$ SUSY GUTs with Proton Decay and Gravitational Waves
• Monopoles, Strings and Gravitational Waves in Non-minimal Inflation
• A Predictive $SO(10)$ Model
• Imprint of PBH domination on gravitational waves generated by cosmic strings
• Probing flavored regimes of leptogenesis with gravitational waves from cosmic strings
• Stochastic gravitational waves from long cosmic strings
• Cosmic Filaments from Cosmic Strings
• Tracking Down the Route to the SM with Inflation and Gravitational Waves
• Untargeted Bayesian search of anisotropic gravitational-wave backgrounds through the analytical marginalization of the posterior
• Future targets for light gauge bosons from cosmic strings
• Gravitational Wave Signatures of Gauged Baryon and Lepton Number
• Cosmic superstrings in large volume compactifications: PTAs, LISA and time-varying tension
• Crescendo Beyond the Horizon: More Gravitational Waves from Domain Walls Bounded by Inflated Cosmic Strings
• Testing hilltop supernatural inflation with gravitational waves
• Confronting SO(10) GUTs with proton decay and gravitational waves
• Complementary signatures of $\alpha -$attractor inflation in CMB and cosmic string Gravitational Waves
• Imprints of an early matter-dominated era arising from dark matter dilution mechanism on cosmic string dynamics and gravitational wave signatures
• Detecting stochastic gravitational wave background from cosmic strings with next-generation detector networks: Component separation based on a multi-source astrophysical foreground noise model
• Probing the Neutrino Seesaw Scale with Gravitational Waves