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DELİCE, ÖZGÜR

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DELİCE

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ÖZGÜR

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2013 - 20153
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Subject: COSMIC STRINGS ×

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Now showing 1 - 3 of 3
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    On generalized Einstein-Rosen waves in Brans-Dicke theory
    (SPRINGER HEIDELBERG, 2014) DELİCE, ÖZGÜR; Akyar, Lokman; Delice, Ozgur
    In this paper cylindrically symmetric vacuum solutions corresponding to generalized Einstein-Rosen-type gravitational waves are considered in the framework of Brans-Dicke (BD) scalar-tensor theory. We see that, similar to axially symmetric vacuum solutions, under some assumptions, it is possible to generate BD-vacuum solutions from corresponding solutions in general relativity. Using this generating technique, we present several exact solutions corresponding to soliton, standing or pulse waves in BD theory. We also present a Kasner-type time-dependent generalization of cylindrically symmetric static vacuum solution. Some physical implications of these solutions are discussed in some detail. The effect of pulse type waves on test particle motion is briefly discussed and compared with static vacuum background. We also see that, similar to general relativity, there are no trapped cylinders in Einstein-Rosen-type solutions in BD theory.
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    Higher dimensional cylindrical or Kasner type electrovacuum solutions
    (SPRINGER/PLENUM PUBLISHERS, 2013-11) DELİCE, ÖZGÜR; Delice, Ozgur; Kirezli, Pinar; Ciftci, Dilek K.
    We consider a dimensional Kasner type diagonal spacetime where metric functions depend only on a single coordinate and electromagnetic field shares the symmetries of spacetime. These solutions can describe static cylindrical or cosmological Einstein-Maxwell vacuum spacetimes. We mainly focus on electrovacuum solutions and four different types of solutions are obtained in which one of them has no four dimensional counterpart. We also consider the properties of the general solution corresponding to the exterior field of a charged line mass and discuss its several properties. Although it resembles the same form with four dimensional one, there is a difference on the range of the solutions for fixed signs of the parameters. General magnetic field vacuum solution are also briefly discussed, which reduces to Bonnor-Melvin magnetic universe for a special choice of the parameters. The Kasner forms of the general solution are also presented for the cylindrical or cosmological cases.
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    PublicationOpen Access
    Brans-Dicke-Maxwell solutions for higher dimensional static cylindrical symmetric spacetime
    (AMER INST PHYSICS, 2015-07) DELİCE, ÖZGÜR; Ciftci, Dilek K.; Delice, Ozgur
    In this paper, Brans-Dicke-Maxwell type vacuum solutions are considered for a static cylindrically symmetric spacetime in arbitrary dimensions. Exact solutions are obtained by directly solving the field equations for the case where an azimuthal magnetic field is present. Other configurations such as axial magnetic field case can be obtained by suitably relabeling the coordinates. We have also considered conformally related Einstein frame to relate the solutions we have obtained with the dilaton-Maxwell type solutions that exist in the literature. We see that for a special case the general solution we present reduces to dilaton-Melvin spacetime. The general relativistic limit of these solutions is also discussed and we found that this limit is different from the four dimensional case. (C) 2015 AIP Publishing LLC.