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    Öğe
    Edtergy-momentum problem in general relativity and tele-parallel gravity for string and domain wall
    (Jagiellonian Univ Press, 2007) Ayguen, Melis; Yilmaz, Ihsan
    This study is purposed to elaborate the problem of energy and momentum distribution of string and domain wall in the context of two different approaches of gravity such as general relativity and tele-parallel gravity. In this connection, we have calculated energy-momentum of domain wall and string by using the energy-momentum definitions of Einstein, Bergmann-Thomson and Landau-Lifshitz in general relativity and tele-parallel gravity. In our analysis we obtained that (i) general relativity and tele-parallel gravity are equivalent theories for string and domain wall (ii) different energy-momentum complexes do not provide the same energy and momentum densities neither in general relativity nor in tele-parallel gravity for domain wall.
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    Öğe
    Energy of rigidly rotating wormhole space-time
    (Amer Inst Physics, 2007) Ayguen, Melis; Yilmaz, Ihsan; Ayguen, Sezgin
    This study is purposed to elaborate the problem of energy distribution of the Rigidly Rotating Wormhole space-time in general theory of relativity. In this connection, we use the energy-momentum definitions of Einstein, Bergmann-Thomson and Tolman. We obtained that the energy distributions of Einstein, Bergmann-Thomson and Tolman definitions give the same results in Rigidly Rotating Wormhole space-time.
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    Öğe
    The Moller energy complexes of various wormholes in general relativity and Teleparallel gravity
    (Springer/Plenum Publishers, 2007) Ayguen, Melis; Yilmaz, Ihsan
    This study is aimed to elaborate the energy problem of general wormhole space-times in two different approaches of gravity such as general relativity and teleparallel gravity. In this connection, the energy for well-known wormhole space-times is evaluated using Moller energy-momentum prescription in these different approximations. We obtained that energy distributions of Moller definition give the same results for various wormhole space-times in general relativity (GR) and teleparallel gravity (TG). The results strengthen the importance of Moller energy-momentum definitions in given space-times and viewpoint of Lessner that Moller energy-momentum complex is a powerful concept for energy and momentum.