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Area of Science:

  • Cosmology and astrophysics
  • Particle physics
  • String theory

Background:

  • The search for dark matter is shifting towards light axionic candidates.
  • Axionic dark matter, motivated by string theory, offers explanations for galaxy formation and dwarf galaxy cores.
  • Direct detection of axionic dark matter's scalar field oscillations is crucial for confirmation.

Purpose of the Study:

  • To investigate the de Broglie interference modulation of dark matter.
  • To predict observable signatures of axionic dark matter, specifically in the Galactic center.
  • To explore the potential of pulsar timing residuals for detecting axionic dark matter.

Main Methods:

  • Solving the coupled Schrödinger-Poisson equation for a Bose-Einstein condensate model of dark matter.
  • Simulating the behavior of axionic dark matter in the Galactic center.
  • Analyzing the impact of oscillating scalar fields on general relativity and pulsar timing.

Main Results:

  • Dark matter is predicted to be fully modulated by de Broglie interference, forming dense soliton cores (≃150 pc) at the Galactic center.
  • The oscillating field induces general relativistic time dilation, leading to detectable pulsar timing residuals (≃400 nsec).
  • Pairwise Galactocentric signatures in pulsar timing can distinguish axionic dark matter from gravitational wave backgrounds.

Conclusions:

  • Axionic dark matter provides a compelling model for dark matter phenomena.
  • Pulsar timing residuals near the Galactic center offer a promising avenue for detecting axionic dark matter.
  • Future radio surveys near the Galactic center could discover new pulsars for this detection method.