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  • 1
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    Kink number in general relativity (1991)
    American Institute of Physics
    Details
    Publication Date: 1991-02-01
    Print ISSN: 0022-2488
    Electronic ISSN: 1089-7658
    Topics: Mathematics , Physics
    Published by American Institute of Physics
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    PAPER CURRENT
  • 2
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    Toy model for gravitational kinks (1992)
    American Institute of Physics
    Details
    Publication Date: 1992-04-01
    Print ISSN: 0022-2488
    Electronic ISSN: 1089-7658
    Topics: Mathematics , Physics
    Published by American Institute of Physics
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    PAPER CURRENT
  • 3
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    Processes and subdivisions in diogenites, a multivariate statistical analysis (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Multivariate statistical techniques used on diogenite orthopyroxene analyses show the relationships that occur within diogenites and the two orthopyroxenite components (class I and II) in the polymict diogenite Garland. Cluster analysis shows that only Peckelsheim is similar to Garland class I (Fe-rich) and the other diogenites resemble Garland class II. The unique diogenite Y 75032 may be related to type I by fractionation. Factor analysis confirms the subdivision and shows that Fe does not correlate with the weakly incompatible elements across the entire pyroxene composition range, indicating that igneous fractionation is not the process controlling total diogenite composition variation. The occurrence of two groups of diogenites is interpreted as the result of sampling or mixing of two main sequences of orthopyroxene cumulates with slightly different compositions.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Meteoritics (ISSN 0026-1114); 19; 15-23
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Melt segregation in plagioclase-poikilitic mesosiderites (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: The Budalan and Mincy mesosiderites contain a poikilitic-plagioclase matrix with orthopyroxene chadacrysts and interstitial-subophitic inverted pigeonite. Orthopyroxene chadacrysts in both mesosiderites are uniformly more aluminous than orthopyroxene clasts, suggesting that they were not derived from clasts by metamorphism. Interstitial inverted pigeonite is more ferroan than adjacent orthopyroxene in the matrix, consistent with the crystallization of a melt with the sequence orthopyroxene followed by pigeonite. The magnesium chadcrysts in Mincy could not have formed from a melt in equilibrium with the clasts but could have crystallized from impact melt. The most Mg chadacrysts are enclosed in large reversely zoned plagioclase crystals as a result of the undercooling in melt-lacking plagioclase clasts and associated nuclei. Mincy contains both plagioclase-poor and plagioclase-rich regions, explained by a separation of silicate melt into pools. Reckling Peak A80258, a plagioclase-poikilitic mesosiderite with a very high chadacryst/plagioclase ratio, resembles Mincy material from which melt has been extracted. It is suggested that the origin of the plagioclase-poikilitic mesosiderites is impact melting of a metal-silicate mixture.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Journal of Geophysical Research (ISSN 0148-0227); 91; D365-D37
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
    Electronic Resource
    Electronic Resource
    Kink number in general relativity (1991)
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 32 (1991), S. 476-479 
    Details
    ISSN: 1089-7658
    Source: AIP Digital Archive
    Topics: Mathematics , Physics
    Notes: A comparison of general relativity with the theory of skyrmions is used to develop a method for counting the number of Finkelstein–Misner kinks in any given general relativistic metric. Some examples of kink number computations are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.529437
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Toy model for gravitational kinks (1992)
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 33 (1992), S. 1437-1444 
    Details
    ISSN: 1089-7658
    Source: AIP Digital Archive
    Topics: Mathematics , Physics
    Notes: The homotopy properties of gravity in 1+1 dimensions are shown to imply the existence of structures analogous to the Finkelstein–Misner kinks of general relativity. A formalism is developed for the construction of kink metrics and a number of simple kink solutions for the (1+1)-dimensional equations are presented−including an n-kink solution that is locally transformable to the usual de Sitter solution and a one-kink solution that is locally transformable to one of the standard FLRW solutions. The relationship between the kink count and the hypersurface decomposition of the space-time manifold is explained in detail.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.529720
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