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Inflatable Dark Matter.

Hooman Davoudiasl1, Dan Hooper2, Samuel D McDermott3

  • 1Department of Physics, Brookhaven National Laboratory, Upton, New York 11973, USA.

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|February 6, 2016
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Summary
This summary is machine-generated.

Inflatable dark matter scenarios propose late-time inflation to reduce dark matter density, resolving overproduction issues. This framework accommodates various dark matter candidates and axion abundances without fine-tuning.

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Area of Science:

  • Cosmology
  • Particle Physics
  • Astrophysics

Background:

  • Many new physics models predict overproduction of dark matter.
  • Existing dark matter candidates face constraints from overproduction or require fine-tuning.

Purpose of the Study:

  • To introduce and explore the
  • inflatable dark matter
  • scenario.
  • To demonstrate how late-time inflation can resolve dark matter overproduction problems.
  • To show the broad applicability of this scenario to various dark matter candidates.

Main Methods:

  • Theoretical modeling of dark matter density evolution.
  • Analysis of particle physics models with a late-time inflationary phase.
  • Investigation of thermal relic and nonthermal axion abundance within the scenario.

Main Results:

  • A short period of late-time inflation can significantly reduce dark matter particle density.
  • The scenario elegantly resolves the overproduction problem for thermal relics.
  • It accommodates both very heavy and very light dark matter candidates.
  • Nonthermal abundances of grand unified theory or Planck scale axions can be controlled without anthropic tuning.

Conclusions:

  • The inflatable dark matter scenario provides a unified solution to dark matter overproduction.
  • It broadens the parameter space for viable dark matter candidates and axion physics.
  • Late-time inflation, potentially triggered by hidden sector physics, offers a flexible cosmological mechanism.