title: Inflatable Dark Matter.
abstract: We describe a general scenario, dubbed "inflatable dark matter," in which the density of dark matter particles can be reduced through a short period of late-time inflation in the early Universe. The overproduction of dark matter that is predicted within many, otherwise, well-motivated models of new physics can be elegantly remedied within this context. Thermal relics that would, otherwise, be disfavored can easily be accommodated within this class of scenarios, including dark matter candidates that are very heavy or very light. Furthermore, the nonthermal abundance of grand unified theory or Planck scale axions can be brought to acceptable levels without invoking anthropic tuning of initial conditions. A period of late-time inflation could have occurred over a wide range of scales from ∼MeV to the weak scale or above, and could have been triggered by physics within a hidden sector, with small but not necessarily negligible couplings to the standard model.
authors: Department of Physics, Brookhaven National Laboratory, Upton, New York 11973, USA.
authors: Hooman
authors: H
authors: Davoudiasl
authors: Center for Particle Astrophysics, Fermi National Accelerator Laboratory, Batavia, Illinois 60510 and Department of Astronomy and Astrophysics, The University of Chicago, Chicago, Illinois 60637, USA.
authors: Dan
authors: D
authors: Hooper
authors: C. N. Yang Institute for Theoretical Physics, Stony Brook, New York 11794, USA.
authors: Samuel D
authors: SD
authors: McDermott