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Emergent Solution to the Strong CP Problem.

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The strong CP problem may be solved by dark matter's collective excitations, acting like axions. This theory suggests dark matter interactions can naturally cancel CP violation in the universe.

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Area of Science:

  • Theoretical Physics
  • Cosmology
  • Particle Physics

Background:

  • The strong CP problem, a persistent puzzle in particle physics, concerns the unexplained absence of CP violation in the strong nuclear force.
  • The axion is a hypothetical particle proposed to solve the strong CP problem, but its experimental detection remains elusive.
  • Dark matter constitutes a significant portion of the universe's mass, yet its fundamental nature and interactions are largely unknown.

Purpose of the Study:

  • To propose a novel theoretical framework where the strong CP problem is resolved as an emergent phenomenon.
  • To explore the possibility of dark matter's properties and interactions providing a solution to the strong CP problem.
  • To investigate the role of collective excitations in dark matter as analogous to axion degrees of freedom.

Main Methods:

  • Construction of a theory linking dark matter's background properties to the strong CP problem solution.
  • Modeling dark matter as a vector particle with low-energy interactions involving its spin density coupled to GG[over ˜].
  • Analysis of multibody collective excitations in dark matter, akin to spin waves, acting as effective axions.

Main Results:

  • The theory demonstrates that dark matter's spin density can induce a potential that compensates for CP violation (θ[over ¯]) in the strong sector.
  • CP violation is effectively removed in regions with sufficient dark matter density.
  • Viable parameter space suggests light dark matter masses, approaching the fuzzy dark matter limit, are preferred.

Conclusions:

  • The study presents a compelling scenario where dark matter itself offers a natural solution to the strong CP problem.
  • Collective excitations within dark matter can mimic axion behavior, providing a mechanism for CP symmetry.
  • The proposed model predicts observable signals associated with light dark matter, warranting further investigation.