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Paper   IPM / Astronomy / 18421
School of Astronomy
  Title:   Inertia
  Author(s):  B. Mashhoon
  Status:   Preprint
  Journal:
  Year:  2025
  Supported by:  IPM
  Abstract:
Inertia of a particle is due to its mass as well as intrinsic spin. The latter is revealed via the coupling of intrinsic spin with rotation. The spin-rotation coupling and the concomitant spin-gravity coupling are discussed in connection with the nature of inertia. The spin-rotation-gravity coupling leads to a gravitomagnetic Stern-Gerlach type of force on the particle that is independent of the particle's mass and thus violates the universality of free fall. This effect is extremely small and its measurement is beyond present capabilities.

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