http://arxiv.org/abs/2104.15130
The gravitational wave (GW) spectrum at frequencies below $\sim 100\,\mathrm{nHz}$ may contain overlapping contributions from processes in the early Universe and black hole binaries with masses $\sim 10^{6}-10^{9}\,M_\odot$ at low redshifts. Pulsar timing arrays are measuring the GW background at $\sim 1-100\,\mathrm{nHz}$, but are currently unable to distinguish an astrophysical foreground from a cosmological background due to, say, a first order phase transition at a temperature $\sim 1-100\,\mathrm{MeV}$ in a weakly-interacting dark sector. Our analysis reveals the extent to which including integrated bounds on the ultra-low frequency GW spectrum from cosmic microwave background, big bang nucleosynethesis or astrometric observations can break this degeneracy.
C. Moore and A. Vecchio
Mon, 3 May 21
15/45
Comments: 3 pages plus appendices. 3 plus 1 figures
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