Yazar "Baysal, Hüsnü" seçeneğine göre listele

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  • [ X ]
    Öğe
    Domain wall solutions with quark matter in higher dimensional space-times
    (Amer Inst Physics, 2007) Aktaş, Can; Yılmaz, İhsan; Baysal, Hüsnü; Aygün, Melis; Demirel, Canan
    In this paper, we have examined quark matter in the perfect form attached to domain walls in the higher dimensional spherical symmetric space-time admitting one-parameter group of conformal motions. For this purpose, we have solved Einstein's field equations for higher dimensional spherical symmetric space-time via conformal motions. Also, we have discussed the features of the obtained solutions.
  • Küçük Resim
    Öğe
    Quark and strange quark matter in f(R) gravity for Bianchi type I and V space-times
    (Springer/Plenum Publishers, 2012) Yılmaz, İhsan; Baysal, Hüsnü; Aktaş, Can
    Behaviors of quark matter and strange quark matter which exist in the first seconds of the early Universe in f(R) gravity are studied for Bianchi I and V universes. In this respect, we obtain exact solutions of the modified Einstein field equations by using anisotropy feature of Bianchi I and V space-times. In particular, we investigate exact f(R) functions for Bianchi I as the contribution of strange quark and quark matter. Also, we have concluded that quark matter may contribute to the early acceleration of the universe since quark matter behaves like phantom-type dark energy. Furthermore, obtained f(R) solutions represents early eras of the Universe since f(R) solutions for quark matter coincide with f(R) equations for inflation. From this point, we can reach the conclusion that quarks may be source of the early dark energy of the universe or source of little inflation due to their repulsive force.
  • [ X ]
    Öğe
    Some string cosmological models in cylindrically symmetric inhomogeneous universe
    (2001) Baysal, Hüsnü; Yavuz, Ilhami; Tarhan, Ismail; Camci, U?ur; Yilmaz, Ihsan
    The aim of this paper is to investigate the behavior of a string in the cylindrically symmetric inhomogeneous cosmological model. It has been assumed that expansion ? in the model is proportional to ?11 of the eigenvalue of the shear tensor ??mu;. Also, various physical and geometrical properties of the model have been discussed.
  • [ X ]
    Öğe
    Szekeres tipi inhomogen ve anizotrop kozmolojilerde string çözümleri
    (1999) Yavuz, İlhami; Kılınç, Battal Can; Baysal, Hüsnü; Yılmaz, İhsan
    Einstein alan denklemlerinin exact çözümleri olan bazı kozmolojik modeller elde edilmektedir. Kullanılan metrik inhomojen ve anizotrop Szekeres tipi metrik ve eğrilik kaynağı ise 1-boyutlu nesneler olan bir string (sicim) bulutudur. Szekeres tipi kozmolojik modeller anizotropinin ve inhomojenliğin başlanamadığı bir ölçekte evrenin incelenmesinde önemli rol oynarlar. Elde edilen modelin çeşitli fiziksel ve geometrik özellikleri de tartışılmıştır.
  • [ X ]
    Öğe
    Teleparallel energy-momentum distribution of various black hole and wormhole metrics
    (World Scientific Publ Co Pte Ltd, 2018) Aygün, Sezgin; Baysal, Hüsnü; Aktaş, Can; Yılmaz, İhsan; Sahoo, P. K.; Tarhan, İsmail
    Using the Einstein, Bergmann-Thomson (BT) and Landau-Lifshitz (LL) energy and momentum formulations in teleparallel gravity (TG), we obtain the total energy and momentum distributions for phantom black hole metric. We get different energy distributions similar to the earlier study and the momentum distributions vanish for phantom black hole metric in TG. These momentum solutions agree with the study of Sahoo et al. in general relativity. However, using Einstein, Bergmann-Thomson and Landau-Lifshitz energy and momentum complexes, we investigate regular black hole, asymptotically flat wormhole, anti-de Sitter wormhole and Ellis wormhole solutions in TG. We obtain i) same BT and LL energy density solutions for regular black hole metric, (ii) same and zero energy distribution for asymptotically flat wormhole, (iii) proportion with Einstein and BT energy density solutions for anti-de Sitter wormhole, (iv) same and negative Einstein and BT energy density solutions for Ellis wormhole in TG.
  • [ X ]
    Öğe
    Timelike and spacelike Ricci collineation vectors in string fluid
    (2003) Baysal, Hüsnü; Yilmaz, Ihsan
    We study the consequences of the existence of timelike and spacelike Ricci collineation vectors (RCVs) for string fluid in the context of general relativity. Necessary and sufficient conditions are derived for a space-time with string fluid to admit a timelike RCV, parallel to ua, and a spacelike RCV, parallel to na. In these cases, some results obtained are discussed.