rotational dynamics torque and conservation of angular momentum

The retrieved evidence spans several physical domains in which angular momentum dynamics and torque play central roles. Here is what the sources directly support:

Angular Momentum Transfer and Torque in Magnetic Systems

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Conservation and Transport of Angular Momentum in Stellar Interiors

Aerts et al. (2019) provide evidence from stellar astrophysics: stars lose a significant amount of angular momentum between birth and death, implying that efficient processes transporting angular momentum from the core to the surface are active . Space asteroseismology revealed that single stars rotate nearly uniformly during core-hydrogen and core-helium burning phases, while stellar cores spin up to a factor of 10 faster than the envelope during the red giant phase . Notably, the angular momentum of the helium-burning core is found to be in agreement with the angular momentum of white dwarfs — a finding consistent with angular momentum conservation across stellar evolution. However, explicitly states that current theory of angular momentum transport fails to explain the strong decrease of core angular momentum observed when stars have a convective core.

Optical Angular Momentum, Torque, and Self-Torque

Rego et al. (2019) demonstrated the generation of dynamic vortex pulses carrying time-varying orbital angular momentum — a property they term "self-torque" — by interfering two time-delayed vortex beams with different orbital angular momenta through high harmonic generation . Such dynamic vortex pulses were proposed as potentially useful for manipulating nanostructures and atoms on ultrafast timescales .

Marrucci et al. (2011) reviewed the coupling and inter-conversion of spin angular momentum (SAM) and orbital angular momentum (OAM) of paraxial light beams in inhomogeneous anisotropic media, particularly via so-called "q-plates" . This spin-to-orbital conversion enables the transfer of quantum information from the SAM qubit space to an OAM subspace of a photon .

Transfer of Angular Momentum to Bound Matter

Schmiegelow et al. (2016) directly demonstrated the transfer of optical orbital angular momentum to the valence electron of a single trapped ion by exciting an atomic transition with a vortex laser beam . They observed strongly modified selection rules showing that an atom can absorb two quanta of angular momentum from a single photon: one from the photon spin and one from the spatial structure of the beam .

Summary

, between stellar core and envelope , or between photon and matter . The evidence only partially addresses classical rotational dynamics (rigid bodies, moment of inertia, etc.) — those specific aspects are not covered by the retrieved papers.