Recent items discussed on Vortex-l have addressed short range effects of a 
gravitational field on small systems of matter.  It seems there should be an 
association of gravity and spin energy/angular momentum, given the equivalence 
of mass and energy.

The following link gives  a discussion of such a theory:

https://en.wikipedia.org/wiki/Einstein%E2%80%93Cartan_theory

Note the torsion tensor becomes important in this theory and allows it to act 
as an independent variable.   Also the discussion notes:

“Einstein–Cartan theory has been historically overshadowed by its torsion-free 
counterpart and other alternatives like Brans–Dicke 
theory<https://en.wikipedia.org/wiki/Brans%E2%80%93Dicke_theory> because 
torsion seemed to add little predictive benefit at the expense of the 
tractability of its equations. Since the Einstein–Cartan theory is purely 
classical, it also does not fully address the issue of quantum 
gravity<https://en.wikipedia.org/wiki/Quantum_gravity>. In the Einstein–Cartan 
theory, the Dirac equation<https://en.wikipedia.org/wiki/Dirac_equation> 
becomes 
nonlinear[7]<https://en.wikipedia.org/wiki/Einstein%E2%80%93Cartan_theory#cite_note-7>
 and therefore the superposition 
principle<https://en.wikipedia.org/wiki/Superposition_principle> used in usual 
quantization techniques would not work. Recently, interest in Einstein–Cartan 
theory has been driven toward 
cosmological<https://en.wikipedia.org/wiki/Physical_cosmology> implications, 
most importantly, the avoidance of a gravitational 
singularity<https://en.wikipedia.org/wiki/Gravitational_singularity> at the 
beginning of the 
universe.[8]<https://en.wikipedia.org/wiki/Einstein%E2%80%93Cartan_theory#cite_note-NP1-8>[9]<https://en.wikipedia.org/wiki/Einstein%E2%80%93Cartan_theory#cite_note-NP2-9>
 The theory is considered viable and remains an active topic in the physics 
community.”

The difficulty associated with the math that stems from the theory has been a 
stumbling block in any coupling of spin and angular momentum  with potential 
and kinetic energy in complex systems of matter.

The discussion of this theory is extended with the following:

http://www.actaphys.uj.edu.pl/fulltext?series=Reg&vol=38&page=2211

IMHO its time that the physics community gets hot on application of this theory 
to potential energy  fields associated with LENR phenomena in nano--systems.  
The quantization  of spin/angular momentum transitions is a key feature to add 
to the analyses.  Good
Computers should help in the nonlinear differential equation solutions.

Bob Cook

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