Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection

Permanent URI for this collectionhttps://hdl.handle.net/11147/7148

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Publisher: search.filters.publisher.World Scientific Publishing Co. Pte LtdSubject: search.filters.subject.Vacuum energy

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  • Article
    Citation - WoS: 17
    Citation - Scopus: 19
    Cosmological Consequences of a Variable Cosmological Constant Model
    (World Scientific Publishing Co. Pte Ltd, 2017) Azri, Hemza; Azri, Hemza; 04.05. Department of Pyhsics; 04. Faculty of Science; 01. Izmir Institute of Technology
    We derive a model of dark energy which evolves with time via the scale factor. The equation-of-state is studied as a function of a parameter α introduced in this model as = (1 - 2α)/(1 + 2α). In addition to the recent accelerated expansion, the model predicts another decelerated phase. These two phases are studied via the parameter α. The age of the universe is found to be almost consistent with the observation. In the limiting case, the cosmological constant model, we find that vacuum energy gravitates with a tiny gravitational constant which evolves with the scale factor, rather than with Newton's constant. This enables degravitation of the vacuum energy which in turn produces the tiny observed curvature, rather than a 120 orders of magnitude larger value.
  • Conference Object
    New Casimir Energy Calculations
    (World Scientific Publishing Co. Pte Ltd, 2007) Ahmedov, Hadji; Duru, İsmail Hakkı; 04.02. Department of Mathematics; 04. Faculty of Science; 01. Izmir Institute of Technology
    New Casimir energy results for massless scalar field in some 3 -dimensional cavities are presented. We attempted to discuss the correlation between the sign and the magnitude of the energy and the shape of the cavities. Sign of the Casimir energy known to be dependent on the dimension, topology and the shape of the geometry. In this note we present some new exact results for massless scalar fields in three dimensional cavities with the trivial topology. We then compare the known Casimir energy values for several three dimensional cavities. The conclusion we arrived is that the existence of the corners lowers the vacuum energy.