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The gravitational waves measured at LIGO are presumed here to come frommerging primordial black holes. We ask how these primordial black holes couldarise through inflationary models while not conflicting with currentexperiments. Among the approaches that work, we investigate the opportunity forcorroboration through experimental probes of gravitational waves at pulsartiming arrays. We provide examples of theories that are already ruled out,theories that will soon be probed, and theories that will not be tested in theforeseeable future. The models that are most strongly constrained are thosewith a relatively broad primordial power spectrum.

Inflationary theory and pulsar timing investigations of primordial black holes and gravitational waves