Dark Matter from quasi-de Sitter Horizons - INSPIRE

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Dark Matter from quasi-de Sitter Horizons

Stefano Profumo
(
- UC, Santa Cruz and
- UC, Santa Cruz, Inst. Part. Phys.
)

Feb 22, 2025

18 pages

e-Print:

2502.16438 [hep-ph]

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Abstract: (arXiv)

Assuming that (1) the universe underwent a post-inflationary accelerated expansion phase driven by a fluid with equation of state

P=w\rho

and

-1<w<-1/3

, that (2) the cosmic horizon in an accelerating, quasi-de Sitter universe has a temperature inversely proportional to the proper size of the horizon, and that (3) we are static observers, we calculate the frozen-in density of a stable particle of mass

m

produced by the cosmic horizon that does not undergo any number-changing processes in the late universe. We find that, as a function of the equation of state and the temperature when radiation domination starts and the quasi-de Sitter phase ends, the mass of the dark matter producing the observed cosmological abundance via this mechanism ranges from 10 keV up to close to the Planck scale.

Note:

18 pages, 5 figures; comments, thoughts, and feedback warmly welcome!

References(56)

Figures(6)

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