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    Öğe
    Energy and momentum of Rigidly Rotating Wormhole space-time
    (Wydawnictwo Uniwersytetu Jagiellonskiego, 2006) Aygun, Melis; Yilmaz, Ihsan; Aygun, Sezgin
    This study is purposed to elaborate the problem of energy and momentum 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 and momentum distributions of Einstein, Bergmann-Thomson and Tolman definitions give the same results in Rigidly Rotating Wormhole space-time.
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    Öğe
    Energy distributions in Szekeres type I and II space-times
    (Polish Acad Sciences Inst Physics, 2006) Aygun, Sezgin; Aygun, Melis; Tarhan, Ismail
    In this study, in context of general relativity we consider Einstein, Bergmann-Thomson, Moller and Landau-Lifshitz energy-momentum definitions and we compute the total energy distribution (due to matter and fields including gravitation) of the universe based on Szekeres class I and class II space-times. We show that Einstein and Bergmann-Thomson definitions of the energy-momentum complexes give the same results, while Moller's and Landau-Lifshitz's energy-momentum definition does not provide same results for Szekeres class II space. The definitions of Einstein, Bergmann-Thomson and Moller definitions of the energy-momentum complexes give similar results in Szekeres class I space-time.
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    Öğe
    Energy-momentum distributions of Hawking wormholes
    (Springer/Plenum Publishers, 2008) Aygun, Melis; Yilmaz, Ihsan
    This study is purposed to elaborate the problem of energy and momentum distributions of the Hawking wormholes in general theory of relativity and teleparallel gravity. In this connection, the energy and momentum for the Hawking wormhole space-time are evaluated using Einstein, Bergmann-Thomson, Landau-Lifshitz and Moller energy-momentum prescriptions in these approximations. We obtained that some of these energy-momentum distributions of Hawking wormhole in the form of general relativity (GR) and teleparallel gravity (TG) give the same results. Also, we obtained that in the teleparallel gravity, Moller energy distributions of the Hawking wormholes give the same results as Einstein energy distributions. However, Bergmann-Thomson and Landau-Lifshitz energy-momentum of Hawking wormholes are the different from each others.
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    Öğe
    Moller energy complexes of monopoles and textures in general relativity and teleparallel gravity
    (Iop Publishing Ltd, 2007) Aygun, Melis; Yilmaz, Ihsan
    The energy problem of monopole and texture spacetimes is investigated in the context of two different approaches of gravity such as general relativity and teleparallel gravity. In this connection, firstly the energies for monopoles and textures are evaluated by using the Moller energy momentum prescription in different approximations. It is obtained that energy distributions of Moller definition give the same results for these topological defects (monopole and texture) in general relativity (GR) and teleparallel gravity (TG). The results strengthen the importance of the Moller energy momentum definitions in given spacetimes and the viewpoint of Lessner that Moller energy momentum complex is a powerful concept for energy and momentum.