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Searching for the QCD dark-matter axion.

Masha Baryakhtar1, Leslie J Rosenberg2, Gray Rybka2

  • 1Physics Department, University of Washington, Seattle, WA 98195-1560, United States of America.

Reports on Progress in Physics. Physical Society (Great Britain)
|September 10, 2025
PubMed
Summary
This summary is machine-generated.

The quantum chromodynamics (QCD) axion, proposed 50 years ago, may solve strong interaction puzzles and is a dark matter candidate. Recent experiments and theoretical work are reviewed, focusing on dark matter axion searches and future techniques.

Keywords:
QCDaxionsdark matter

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Area of Science:

  • Particle Physics
  • Cosmology
  • Astrophysics

Background:

  • The quantum chromodynamics (QCD) axion was proposed to resolve the strong CP problem.
  • It is a leading candidate for cold dark matter.
  • Recent years have seen significant advancements in axion detection experiments and theoretical understanding.

Purpose of the Study:

  • To review astrophysical searches for the QCD axion.
  • To summarize theoretical progress on axion dark matter.
  • To provide an overview of current and future dark matter axion experiments.

Main Methods:

  • Review of astrophysical search strategies.
  • Analysis of theoretical developments in axion physics.
  • Survey of experimental techniques for axion detection.

Main Results:

  • The QCD axion remains a compelling candidate for dark matter.
  • Experimental sensitivity and mass range for axion searches have rapidly improved.
  • Theoretical frameworks for axion dark matter have been further developed.

Conclusions:

  • The search for the QCD axion is an active and evolving field.
  • Future experiments aim to improve sensitivity and explore new detection techniques.
  • Continued theoretical and experimental efforts are crucial for understanding the axion's role in the universe.