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Millisecond pulsars act as galactic accelerometers, enabling direct measurement of local galactic acceleration. This novel approach offers a new method for mapping dark matter distribution in the Milky Way galaxy.

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Area of Science:

  • Astronomy and Astrophysics
  • Cosmology
  • Fundamental Physics

Background:

  • Millisecond pulsars exhibit exceptional temporal stability, comparable to atomic clocks.
  • Pulsars can be utilized as sensitive probes of gravitational fields and accelerations.

Purpose of the Study:

  • To directly measure the local galactic acceleration using an ensemble of millisecond pulsars.
  • To establish a novel method for probing galactic dynamics and dark matter distribution.

Main Methods:

  • Utilizing pulsar spin period measurements from 117 millisecond pulsars to determine acceleration sensitivity.
  • Conducting a complementary analysis of 13 binary pulsar systems to mitigate systematics.

Main Results:

  • Demonstrated acceleration sensitivity with approximately 1σ precision using pulsar spin periods.
  • Derived a local galactic acceleration of (1.7±0.5)×10⁻¹⁰ m/s², consistent with theoretical expectations.

Conclusions:

  • Millisecond pulsars can serve as effective accelerometers for measuring local galactic acceleration.
  • This technique is a foundational step towards dynamically mapping acceleration gradients and understanding dark matter distribution in the Milky Way.