From NANOGrav to LIGO with metastable cosmic strings

Sep 22, 2020
4 pages
Published in:
  • Phys.Lett.B 811 (2020) 135914
  • Published: Dec 10, 2020
e-Print:
Report number:
  • CERN-TH-2020-157,
  • DESY 20-154,
  • DESY-20-154
Experiments:

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Abstract: (Elsevier)
We interpret the recent NANOGrav results in terms of a stochastic gravitational wave background from metastable cosmic strings. The observed amplitude of a stochastic signal can be translated into a range for the cosmic string tension and the mass of magnetic monopoles arising in theories of grand unification. In a sizable part of the parameter space, this interpretation predicts a large stochastic gravitational wave signal in the frequency band of ground-based interferometers, which can be probed in the very near future. We confront these results with predictions from successful inflation, leptogenesis and dark matter from the spontaneous breaking of a gauged B − L symmetry.
Note:
  • 5 pages, 2 figures. Minor bug in Fig. 1 fixed, results unchanged
  • gravitational radiation: stochastic
  • gravitational radiation: background
  • magnetic monopole: mass
  • cosmic string
  • spontaneous symmetry breaking
  • grand unified theory
  • interferometer
  • string tension
  • leptogenesis
  • dark matter