25 citations
- Feza Gürsey InstituteTR3 papers
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- Institute of PhysicsPL2 papers
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- Ankara UniversityTR1 paper
- Autonomous University of San Luis PotosíMX1 paper
- Ball State UniversityUS1 paper
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- Centro Brasileiro de Pesquisas FísicasBR1 paper
- Doğuş UniversityTR1 paper
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6 papers · 1 filter
Symmetry analysis and exact solutions of modified Brans-Dicke cosmological equations
Metin Arik, Mikhail B. Sheftel
We perform a symmetry analysis of modified Brans-Dicke cosmological equations and present exact solutions. We discuss how the solutions may help to build models of cosmology where,…
Boundary Effects in Local Inflation and Spectrum of Density Perturbations
Erol Ertan, Ali Kaya
We observe that when a local patch in a radiation filled Robertson-Walker universe inflates by some reason, outside perturbations can enter into the inflating region. Generally, th…
Radiating Levi-Civita Spacetime
Ozgur Delice
This paper has been withdrawn by the author, See J.Krishna Rao, J. Phys. A: Gen. Phys., 4, 17 (1971) for radiating Levi-Civita metric.
Kasner generalization of Levi-Civita spacetime
Ozgur Delice
We investigate some cylindrically symmetric nonstationary and nonstatic solutions of Einstein field equations. We first study some physical properties of a solution which can be co…
Static Cylindrical Matter Shells
Metin Arik, Ozgur Delice
Static cylindrical shells composed of massive particles arising from matching of two different Levi-Civita space-times are studied for the shell satisfying either isotropic or anis…
Gravitational hedgehog, stringy hedgehog and stringy sphere
Ozgur Delice
We investigate the solutions of Einstein equations such that a hedgehog solution is matched to different exterior or interior solutions via a spherical shell. In the case where bot…