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Superheavy Thermal Dark Matter.

Hyungjin Kim1, Eric Kuflik2

  • 1Department of Particle Physics and Astrophysics, Weizmann Institute of Science, Rehovot 7610001, Israel.

Physical Review Letters
|November 26, 2019
PubMed
Summary
This summary is machine-generated.

We propose a novel mechanism for super heavy thermal dark matter, with masses up to 10^14 GeV. Its abundance is determined by standard model interactions, with implications for cosmology and cosmic ray experiments.

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Area of Science:

  • Cosmology
  • Particle Physics
  • Astrophysics

Background:

  • The nature of dark matter remains one of the most significant unsolved problems in modern physics.
  • Understanding dark matter's origin and properties is crucial for a complete cosmological model.

Purpose of the Study:

  • To propose a mechanism for elementary thermal dark matter with very high masses.
  • To explore the implications of such dark matter for cosmological observations and experiments.

Main Methods:

  • Modeling dark matter relic abundance through interactions with the Standard Model bath.
  • Considering a system of nearly degenerate particles in a nearest-neighbor chain.
  • Incorporating in-equilibrium decays and inverse decays to maintain chemical equilibrium.

Main Results:

  • A viable mechanism for dark matter with masses up to 10^14 GeV within standard cosmology.
  • Relic abundance determined by Standard Model interactions without violating perturbative unitarity.
  • Phenomenology includes super heavy dark matter and heavy relics decaying at various cosmic epochs.

Conclusions:

  • The proposed mechanism offers a new avenue for understanding super heavy dark matter.
  • The model has testable implications for cosmic microwave background, structure formation, and cosmic ray experiments.