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  • 1
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    The role and behavior of spin in gravitational physics (1987)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: A self-consistent method of introducing spin into any Lagrangian based theory of gravitation was developed. The metric variation of the Lagrangian in the theory leads to an improved energy-momentum tensor which represents the source term in the gravitational field equations. The goal of the research is the construction of a theory general enough to be used to investigate spin effects in astrophysical objects and cosmology, and also to serve as a basis for discussion of the theoretical ideas tested by the NASA Gyroscope Experiment (aboard Gravity Probe B). Specific accomplishments in the following areas are summarized: the inclusion of electromagnetism into the variational principle for spinning matter, formulation of a self-consistent theory for the case of a fluid in which particle production processes occur, and the derivation of the Raychaudhuri equation in the case of spinning matter.
    Keywords: ASTROPHYSICS
    Type: NASA-CR-180654 , NAS 1.26:180654
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Equation-of-state spinning fluids in the Einstein-Cartan theory (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: The relativistic fluid equations may be completed in two physically distinct methods. One method assumes the mass, rho, (or particle number) is conserved, while the other method assumes an equation of state of the form P = P(rho). A variational principle for the mass conservation method both with and without an intrinsic spin for the fluid was constructed earlier (Ray and Smalley, 1982 and 1983). A variational principle for the fluid described by an equation of state both with and without spin is formulated. In all cases the variational principle is set in the Einstein-Cartan metric-torsion U4 geometry. The results for general relativity follow as a special case.
    Keywords: ASTROPHYSICS
    Type: Physical Review D - Particles and Fields, 3rd Series (ISSN 0556-2821); 35; 1185-118
    Format: text
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    NASA TECHNICAL REPORTS
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