Cosmic String Interpretation of NANOGrav Pulsar Timing Data

Sep 14, 2020
7 pages
Published in:
  • Phys.Rev.Lett. 126 (2021) 4, 041304
  • Published: Jan 29, 2021
e-Print:
Report number:
  • KCL-PH-TH/2020-53,
  • CERN-TH-2020-150

Citations per year

20192021202320252025020406080
Abstract: (APS)
Pulsar timing data used to provide upper limits on a possible stochastic gravitational wave background (SGWB). However, the NANOGrav Collaboration has recently reported strong evidence for a stochastic common-spectrum process, which we interpret as a SGWB in the framework of cosmic strings. The possible NANOGrav signal would correspond to a string tension Gμ∈(4×10-11,10-10) at the 68% confidence level, with a different frequency dependence from supermassive black hole mergers. The SGWB produced by cosmic strings with such values of Gμ would be beyond the reach of LIGO, but could be measured by other planned and proposed detectors such as SKA, LISA, TianQin, AION-1 km, AEDGE, Einstein Telescope, and Cosmic Explorer.
Note:
  • matches version published in PRL
  • Gravitation and Astrophysics
  • gravitational radiation: stochastic
  • gravitational radiation: background
  • frequency: dependence
  • detector: proposed
  • cosmic string
  • pulsar
  • Einstein Telescope
  • string tension
  • black hole: binary
Loading ...