Physics Beyond the Standard Model With Pulsar Timing Arrays. (arXiv:1907.04960v1 [gr-qc])

Physics Beyond the Standard Model With Pulsar Timing Arrays. (arXiv:1907.04960v1 [gr-qc])
<a href="http://arxiv.org/find/gr-qc/1/au:+Siemens_X/0/1/0/all/0/1">Xavier Siemens</a>, <a href="http://arxiv.org/find/gr-qc/1/au:+Hazboun_J/0/1/0/all/0/1">Jeffrey S. Hazboun</a>, <a href="http://arxiv.org/find/gr-qc/1/au:+Baker_P/0/1/0/all/0/1">Paul T. Baker</a>, <a href="http://arxiv.org/find/gr-qc/1/au:+Burke_Spolaor_S/0/1/0/all/0/1">Sarah Burke-Spolaor</a>, <a href="http://arxiv.org/find/gr-qc/1/au:+Madison_D/0/1/0/all/0/1">Dustin Madison</a>, <a href="http://arxiv.org/find/gr-qc/1/au:+Mingarelli_C/0/1/0/all/0/1">Chiara Mingarelli</a>, <a href="http://arxiv.org/find/gr-qc/1/au:+Simon_J/0/1/0/all/0/1">Joseph Simon</a>, <a href="http://arxiv.org/find/gr-qc/1/au:+Smith_T/0/1/0/all/0/1">Tristan Smith</a>

Pulsar timing arrays (PTAs) will enable the detection of nanohertz
gravitational waves (GWs) from a population of supermassive binary black holes
(SMBBHs) in the next $sim 3-7$ years. In addition, PTAs provide a rare
opportunity to probe exotic physics. Potential sources of GWs in the nanohertz
band include, cosmic strings and cosmic superstrings, inflation and, phase
transitions in the early universe. GW observations will also make possible
tests of gravitational theories that, by modifying Einstein’s theory of general
relativity, attempt to explain the origin of cosmic acceleration and reconcile
quantum mechanics and gravity, two of the most profound challenges facing
fundamental physics today. Finally, PTAs also provide a new means to probe
certain dark matter models.

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