TL;DR
This paper discusses how intrinsic spin contributes to inertia through spin-rotation and spin-gravity couplings, leading to a gravitomagnetic force that challenges the universality of free fall, though it remains experimentally unmeasurable now.
Contribution
It introduces the concept of spin-rotation and spin-gravity coupling effects on inertia, highlighting a potential violation of free fall universality due to a gravitomagnetic force.
Findings
Spin-rotation coupling affects particle inertia.
Spin-gravity coupling induces a gravitomagnetic force.
The effect violates the universality of free fall.
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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Taxonomy
TopicsExperimental and Theoretical Physics Studies · Relativity and Gravitational Theory · Quantum and Classical Electrodynamics