Kavli Affiliate: Masahiro Kawasaki
| First 5 Authors: Masahiro Kawasaki, Kai Murai, , ,
| Summary:
The existence of a stochastic gravitational wave background is indicated by
the recent pulsar timing array (PTA) experiments. We study the enhanced
production of second-order gravitational waves from the scalar perturbations
when the universe experiences a transition from the early matter-dominated era
to the radiation-dominated era due to Q-ball decay. We extend the analysis in
previous work by including the frequency range where density perturbations go
non-linear and find that the resultant gravitational wave spectrum can be
consistent with that favored by the recent PTA experiment results.
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