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Holographic Dark Matter

Sylvain Fichet, Eugenio Megias, Mariano Quiros

Abstract

Cold dark matter may be a fluid (or plasma) residing in a strongly-interacting hidden sector, rather than a population of weakly-coupled particles. Such a scenario admits a holographic description in terms of a cosmological braneworld embedded in the linear dilaton five-dimensional (5D) spacetime. In this framework, dark matter originates from the linear dilaton bulk black hole, whose phase we show to be thermodynamically favored at all temperatures. We present a natural freeze-in mechanism for the production of holographic dark matter, in which the bulk black hole is fed by energy leaking from the brane after inflation. Our model is characterized by two free parameters, one of which, the position of the black hole horizon, is fixed by the observed dark matter abundance. The remaining parameter, the 5D Planck scale $M_5$, is consistent with all current experimental bounds provided that $M_5\gtrsim 3\times 10^5$ TeV.

Holographic Dark Matter

Abstract

Cold dark matter may be a fluid (or plasma) residing in a strongly-interacting hidden sector, rather than a population of weakly-coupled particles. Such a scenario admits a holographic description in terms of a cosmological braneworld embedded in the linear dilaton five-dimensional (5D) spacetime. In this framework, dark matter originates from the linear dilaton bulk black hole, whose phase we show to be thermodynamically favored at all temperatures. We present a natural freeze-in mechanism for the production of holographic dark matter, in which the bulk black hole is fed by energy leaking from the brane after inflation. Our model is characterized by two free parameters, one of which, the position of the black hole horizon, is fixed by the observed dark matter abundance. The remaining parameter, the 5D Planck scale , is consistent with all current experimental bounds provided that TeV.
Paper Structure (31 sections, 74 equations, 2 figures)

This paper contains 31 sections, 74 equations, 2 figures.

Table of Contents

  1. Introduction
  2. Comparison to the Literature
  3. Outline
  4. Holographic Fluids
  5. The ${\cal M}_\nu$ Spacetimes
  6. Physics on the Brane: Einstein Equation and Holographic Fluids
  7. Thermodynamics of Holographic Fluids
  8. Dark Matter as the $\nu = 1$ Holographic Fluid
  9. Braneworld Cosmology and Friedmann Equations
  10. Dark Matter as a Holographic Fluid
  11. Holographic Dark Matter Thermodynamics
  12. Brief summary.
  13. On the Model Parameters
  14. Freeze-in Production of Holographic Dark Matter
  15. Heating the Bulk: Graviton Radiation from the Brane
  16. ...and 16 more sections

Figures (2)

  • Figure 1: The freeze-in of holographic dark matter.
  • Figure 2: Energy-to-entropy ratio $\rho_{\rm DM} / s_{\textrm{tot}}$, normalized by $g_{\star,S}$, as a function of $T_{\textrm{SM},R} / T_{\textrm{SM}}$. This quantity freezes at temperature $T_{\textrm{SM}}\ll T_{\textrm{SM},R}$.