Gravitational waves from low-scale cosmic strings

Abstract

Cosmic strings are a common prediction in many grand unified theories and a promising source of stochastic gravitational waves (GWs) from the early Universe. In this paper, we point out that the GW signal from cosmic strings produced at a comparatively low energy scale, $v\lesssim 10^9\text{GeV}$, exhibits several novel features that are not present in the case of high-scale cosmic strings. Our findings notably include (i) a sharp cutoff frequency $f_{\mathrm{cut}}$ in the GW spectrum from the fundamental oscillation mode on closed string loops and (ii) an oscillating pattern in the total GW spectrum from all oscillation modes whose local minima are located at integer multiples of $f_{\mathrm{cut}}$. These features reflect the fact that string loops produced in the early Universe fail to shrink to zero size because of GW emission within the age of the Universe, if their tension is low enough. In addition, they offer an exciting opportunity to directly probe the discrete spectrum of oscillation modes on closed string loops in GW observations. For strings produced at a scale $v\sim 10^9\text{GeV}$, the novel features in the GW spectrum are within the sensitivity reach of future experiments such as BBO and DECIGO.

17 pages, 4 figures; v2: references added, minor additions to the text, matches version published in Phys. Rev. D

References in corpus (51)

• TianQin: a space-borne gravitational wave detector
• The NANOGrav 15-year Data Set: Evidence for a Gravitational-Wave Background
• Search for an isotropic gravitational-wave background with the Parkes Pulsar Timing Array
• Searching for the nano-Hertz stochastic gravitational wave background with the Chinese Pulsar Timing Array Data Release I
• Gravitational Wave Experiments and Early Universe Cosmology
• The second data release from the European Pulsar Timing Array III. Search for gravitational wave signals
• Possibility of Direct Measurement of the Acceleration of the Universe Using 0.1 Hz Band Laser Interferometer Gravitational Wave Antenna in Space
• Cosmological Backgrounds of Gravitational Waves
• The NANOGrav 15-year Data Set: Search for Signals from New Physics
• Gravitational radiation from cosmic (super)strings: bursts, stochastic background, and observational windows
• Detecting the Cosmic Gravitational Wave Background with the Big Bang Observer
• Gravitational wave bursts from cosmic strings
• Gravitational wave bursts from cusps and kinks on cosmic strings
• How generic is cosmic string formation in SUSY GUTs
• The NANOGrav 15-year Data Set: Constraints on Supermassive Black Hole Binaries from the Gravitational Wave Background
• The number of cosmic string loops
• New Sensitivity Curves for Gravitational-Wave Signals from Cosmological Phase Transitions
• Cosmic String Interpretation of NANOGrav Pulsar Timing Data
• Probing the gravitational wave background from cosmic strings with LISA
• Extending the Velocity-dependent One-scale String Evolution Model
• Has NANOGrav found first evidence for cosmic strings?
• Large parallel cosmic string simulations: New results on loop production
• Stochastic gravitational wave background from smoothed cosmic string loops
• Constraints on cosmic strings using data from the third Advanced LIGO-Virgo observing run
• From NANOGrav to LIGO with metastable cosmic strings
• Constraints on cosmic strings using data from the first Advanced LIGO observing run
• Beyond the Standard Models with Cosmic Strings
• Testing Seesaw and Leptogenesis with Gravitational Waves
• Gravitational wave bursts from cosmic (super)strings: Quantitative analysis and constraints
• Exact Scale-Invariant Background of Gravitational Waves from Cosmic Defects
• Probing the scale of grand unification with gravitational waves
• Stochastic gravitational-wave background from metastable cosmic strings
• Stochastic gravitational waves from cosmic string loops in scaling
• Decay of Cosmic String Loops Due to Particle Radiation
• Comparison of cosmic string and superstring models to NANOGrav 12.5-year results
• Stochastic Gravitational Wave Background generated by Cosmic String Networks: Velocity-Dependent One-Scale model versus Scale-Invariant Evolution
• The Gravitational Wave Spectrum from Cosmological B-L Breaking
• Field theory simulation of Abelian-Higgs cosmic string cusps
• The form of cosmic string cusps
• Particle emission and gravitational radiation from cosmic strings: observational constraints
• Cosmic string loop shapes
• Irreducible background of gravitational waves from a cosmic defect network: update and comparison of numerical techniques
• Gravitational Wave Bursts from Cosmic Superstrings with Y-junctions
• Microlensing by Cosmic Strings
• Gravitational wave signatures from kink proliferation on cosmic (super-) strings
• Ultrahigh frequency primordial gravitational waves beyond the kHz: The case of cosmic strings
• Observing cosmic string loops with gravitational lensing surveys
• Direct determination of cosmic string loop density from simulations
• Nambu-Goto Dynamics of Field Theory Cosmic String Loops
• Proliferation of sharp kinks on cosmic (super-)string loops with junctions
• Cosmic String Loop Microlensing

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