The born again Universe
Peter W. Graham, David E. Kaplan, Surjeet Rajendran
https://arxiv.org/abs/1709.01999
Further papers:
Opening up the axion window, https://arxiv.org/pdf/1708.05008.pdf
The merger rate of PBH binaries, https://arxiv.org/pdf/1709.06576.pdf
PBH dark matter from single field inflation, https://arxiv.org/pdf/1709.05565.pdf
