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  • 2000-2004  (3)
  • 1990-1994  (6)
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  • 1
    Electronic Resource
    Electronic Resource
    Ultralow frequency waves and total electron content fluctuations (2001)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 90 (2001), S. 2582-2590 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Low frequency electromagnetic waves in the ionosphere are examined, and we calculate the refraction angles and other properties as these waves propagate through the ionosphere. The correlation to fluctuations in the total electron content is derived, and the results are compared to observed results. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1380999
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Second-order equations and quadratic Lagrangians (1990)
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 31 (1990), S. 2221-2224 
    Details
    ISSN: 1089-7658
    Source: AIP Digital Archive
    Topics: Mathematics , Physics
    Notes: From a general Lagrangian that is quadratic in the Ricci tensor, independent variations of the metric and torsion tensors produce gravitational field equations that are of second differential order in the metric tensor. This reduction in order from four results from the use of the torsional field equations. Also, the equation of motion is derived and several special cases are considered.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.528629
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Tetrad formulation of gravity with a torsion potential (1994)
    Springer
    General relativity and gravitation 26 (1994), S. 1107-1116 
    Details
    ISSN: 1572-9532
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A tetrad formulation of gravity with a torsion potential is presented. The torsion is derived from the exterior derivative of a second rank tensor potential. The geometrical Lagrangian is the curvature scalar and variations are taken with respect to the tetrad components. It is shown that the resulting field equations, and conservation laws, are identical to those obtained in a purely holonomic frame.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02108936
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Gauge invariant electromagnetic coupling with torsion potential (1991)
    Springer
    General relativity and gravitation 23 (1991), S. 1195-1203 
    Details
    ISSN: 1572-9532
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Electromagnetism is coupled to torsion in a gauge invariant manner by relaxing minimal coupling and introducing into the Lagrangian a term bilinear in the electromagnetic field tensor and the torsion potential. The resulting coupling between electromagnetism and torsion is examined and a solution corresponding to traveling coupled waves is given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00756844
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Spin, torsion, forces (1994)
    Springer
    General relativity and gravitation 26 (1994), S. 247-263 
    Details
    ISSN: 1572-9532
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A theory of gravitation with torsion that is derived from a potential is developed. An explicit material action is presented that gives rise to the correct conservation laws and equations of motion. It is shown that the Noether identities yield the same conservation laws as the Bianchi identities, and the Papapetrou method is used to develop the propagation equations and the force law. The equations are put in the nonrelativistic limit and the 3-vector formulation is displayed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02108005
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  • 6
    Electronic Resource
    Electronic Resource
    Strings in Gravity with Torsion (2000)
    Springer
    General relativity and gravitation 32 (2000), S. 2007-2019 
    Details
    ISSN: 1572-9532
    Keywords: strings ; torsion ; Bianchi identity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A theory of gravitation in 4D is presented with strings used in the material action in U 4 spacetime. It is shown that the string naturally gives rise to torsion. It is also shown that the equation of motion a string follows from the Bianchi identity, gives the identical result as the Noether conservation laws, and follows a geodesic only in the lowest order approximation. In addition, the conservation laws show that strings naturally have spin, which arises not from their motion but from their one dimensional structure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1001942301598
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  • 7
    Electronic Resource
    Electronic Resource
    Magnetic charge type equations from torsion (1991)
    Springer
    General relativity and gravitation 23 (1991), S. 973-980 
    Details
    ISSN: 1572-9532
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract It is shown that torsion can be built from two independent vector fields, and that these vector fields obey, for the Lagrangian chosen, the equations of electromagnetism with magnetic charge from the two photon formalism. The equation of motion follows from the Bianchi identity ofU 4 spacetime, and finally the interpretation of these fields is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00756860
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    Strings Have Spin (2000)
    Springer
    General relativity and gravitation 32 (2000), S. 347-351 
    Details
    ISSN: 1572-9532
    Keywords: Torsion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract If a string source is used to replace the conventional point-like source of gravitation in spacetime with torsion, then intrinsic spin arises naturally as an attribute of the string. This spin stems from the structure of the string, and not from internal motions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1001948028584
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    Paper (German National Licenses)
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  • 9
    Electronic Resource
    Electronic Resource
    Dynamic torsion from a linear lagrangian (1990)
    Springer
    General relativity and gravitation 22 (1990), S. 451-456 
    Details
    ISSN: 1572-9532
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Following the example of electromagnetism, a torsion potential is introduced. By considering variations with respect to the metric tensor and the torsion potential, a theory of gravitation with propagating torsion is obtained. Sources are introduced and the equation of motion is obtained.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00756151
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    Paper (German National Licenses)
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