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  • 1
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    Torsion as a source of expansion in a Bianchi type-I universe in the self-consistent Einstein-Cartan theory of a perfect fluid with spin density (1987)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: It is shown that a generalized (or 'power law') inflationary phase arises naturally and inevitably in a simple (Bianchi type-I) anisotropic cosmological model in the self-consistent Einstein-Cartan gravitation theory with the improved stress-energy-momentum tensor with the spin density of Ray and Smalley (1982, 1983). This is made explicit by an analytical solution of the field equations of motion of the fluid variables. The inflation is caused by the angular kinetic energy density due to spin. The model further elucidates the relationship between fluid vorticity, the angular velocity of the inertially dragged tetrads, and the precession of the principal axes of the shear ellipsoid. Shear is not effective in damping the inflation.
    Keywords: ASTROPHYSICS
    Type: Physical Review D - Particles and Fields, 3rd Series (ISSN 0556-2821); 35; 2302-230
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Ideal black hole fluid (1989)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The concept of a primordial black hole fluid is introduced and its consequence for supercluster-sized (i.e., large scale voids) and the missing mass question are discussed.
    Keywords: ASTROPHYSICS
    Type: NASA-TM-100349 , NAS 1.15:100349
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Ideal black hole gas (1989)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The concept of a primordial blackhole fluid with intrinsic spin density is examined along with its consequence for supercluster-sized, i.e., large scale voids, and the missing mass question.
    Keywords: ASTROPHYSICS
    Type: NASA-TM-101788 , NAS 1.15:101788
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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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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