Has NANOGrav found first evidence for cosmic strings?. (arXiv:2009.06607v2 [astro-ph.CO] UPDATED)

Has NANOGrav found first evidence for cosmic strings?. (arXiv:2009.06607v2 [astro-ph.CO] UPDATED)
<a href="http://arxiv.org/find/astro-ph/1/au:+Blasi_S/0/1/0/all/0/1">Simone Blasi</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Brdar_V/0/1/0/all/0/1">Vedran Brdar</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Schmitz_K/0/1/0/all/0/1">Kai Schmitz</a>

The North American Nanohertz Observatory for Gravitational Waves (NANOGrav)
has recently reported strong evidence for a stochastic common-spectrum process
affecting the pulsar timing residuals in its 12.5-year data set. We demonstrate
that this process admits an interpretation in terms of a stochastic
gravitational-wave background emitted by a cosmic-string network in the early
Universe. We study local Nambu-Goto strings in dependence of their tension
$Gmu$ and loop size $alpha$ and show that the entire viable parameter space
will be probed by an array of future experiments.

The North American Nanohertz Observatory for Gravitational Waves (NANOGrav)
has recently reported strong evidence for a stochastic common-spectrum process
affecting the pulsar timing residuals in its 12.5-year data set. We demonstrate
that this process admits an interpretation in terms of a stochastic
gravitational-wave background emitted by a cosmic-string network in the early
Universe. We study local Nambu-Goto strings in dependence of their tension
$Gmu$ and loop size $alpha$ and show that the entire viable parameter space
will be probed by an array of future experiments.

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