Cosmic String Interpretation of NANOGrav Pulsar Timing Data. (arXiv:2009.06555v1 [astro-ph.CO])
<a href="http://arxiv.org/find/astro-ph/1/au:+Ellis_J/0/1/0/all/0/1">John Ellis</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Lewicki_M/0/1/0/all/0/1">Marek Lewicki</a>
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 $Gmu in (4, 9) times
10^{-11}$ 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 $Gmu$ would be beyond the reach of LIGO, but could be measured
by other planned and proposed detectors such as SKA, LISA, TianQin, AION-1km,
AEDGE, Einstein Telescope and Cosmic Explorer.
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 $Gmu in (4, 9) times
10^{-11}$ 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 $Gmu$ would be beyond the reach of LIGO, but could be measured
by other planned and proposed detectors such as SKA, LISA, TianQin, AION-1km,
AEDGE, Einstein Telescope and Cosmic Explorer.
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