Comparison of cosmic string and superstring models to NANOGrav 12.5-year results

Feb 16, 2021
9 pages
Published in:
  • Phys.Rev.D 103 (2021) 10, 103512
  • Published: May 12, 2021
e-Print:

Citations per year

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Abstract: (arXiv)
We compare the spectrum of the stochastic gravitational wave background produced in several models of cosmic strings with the common-spectrum process recently reported by NANOGrav. We discuss theoretical uncertainties in computing such a background, and show that despite such uncertainties, cosmic strings remain a good explanation for the potential signal, but the consequences for cosmic string parameters depend on the model. Superstrings could also explain the signal, but only in a restricted parameter space where their network behavior is effectively identical to that of ordinary cosmic strings.
Note:
  • 15 pages, RevTex
  • Cosmology
  • gravitational radiation: stochastic
  • gravitational radiation: background
  • gravitational radiation: power spectrum
  • cosmic string
  • superstring
  • NANOGrav
  • cosmic string: network
  • string model
  • cosmological model