Primordial black holes from thermal inflation

  title={Primordial black holes from thermal inflation},
  author={Konstantinos Dimopoulos and Tommi Markkanen and Antonio Racioppi and Ville Vaskonen},
  journal={Journal of Cosmology and Astroparticle Physics},
We present a novel mechanism for the production of primordial black holes (PBHs). The mechanism is based on a period of thermal inflation followed by fast-roll inflation due to tachyonic mass of order the Hubble scale. Large perturbations are generated at the end of the thermal inflation as the thermal inflaton potential turns from convex to concave. These perturbations can lead to copious production of PBHs when the relevant scales re-enter horizon. We show that such PBHs can naturally account… 

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