Yilmaz, Nejat Tevfik
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Nejat Tevfik Yilmaz
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Doç.Dr.
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01.01.09.02. Elektrik- Elektronik Mühendisliği
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Former Staff
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Documents
26
Citations
87
h-index
5
Documents
31
Citations
127
Scholarly Output
11
Articles
11
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0
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0
WoS Citation Count
11
Scopus Citation Count
6
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0
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0
WoS Citations per Publication
1.00
Scopus Citations per Publication
0.55
Open Access Source
5
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0
| Journal | Count |
|---|---|
| Journal of Cosmology and Astroparticle Physics | 3 |
| Modern Physics Letters A | 2 |
| Physical Review D | 2 |
| Physics of the Dark Universe | 2 |
| Chinese Physics B | 1 |
Current Page: 1 / 2
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11 results
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Now showing 1 - 10 of 11
Article Citation - WoS: 6Effective matter cosmologies of massive gravity I: non-physical fluids(IOP PUBLISHING LTD, 2014) Nejat Tevfik Yilmaz; Yilmaz, Nejat TevfikFor the massive gravity after decoupling from the metric equation we find a broad class of solutions of the Stuckelberg sector by solving the background metric in the presence of a diagonal physical metric. We then construct the dynamics of the corresponding FLRW cosmologies which inherit effective matter contribution through the decoupling solution mechanism of the scalar sector.Article Decoupling solution moduli of bigravity(Elsevier B.V., 2016) Nejat Tevfik Yilmaz; Yilmaz, Nejat TevfikA complete classification of exact solutions of ghost-free massive bigravity is derived which enables the dynamical decoupling of the background and the foreground metrics. The general decoupling solution space of the two metrics is constructed. Within this branch of the solution space the foreground metric theory becomes general relativity (GR) with an additional effective cosmological constant and the background metric dynamics is governed by plain GR. © 2016 Elsevier B.V. All rights reserved.Article Effective matter cosmologies of massive gravity: Physical fluids(AMER PHYSICAL SOC, 2014) Nejat Tevfik YilmazWe derive new cosmological solutions of the ghost-free massive gravity with a general background metric in which the contribution of the mass sector to the metric one is modeled by an effective cosmological constant and an ideal fluid which obeys the first law of thermodynamics, thus it satisfies the ordinary energy-momentum conservation or continuity equation.Article Citation - WoS: 2Citation - Scopus: 4Supergravity-induced interactions on thick branes(Institute of Physics Publishing custserv@iop.org, 2014) Nejat Tevfik Yilmaz; Yilmaz, Nejat T.The gravity coupling of the symmetric space sigma model is studied in the solvable Lie algebra parametrization. The corresponding Einstein equations are derived and the energy-momentum tensor is calculated. The results are used to derive the dynamical equations of the warped five-dimensional (5D) geometry for localized bulk scalar interactions in the framework of thick brane world models. The Einstein and scalar field equations are derived for flat brane geometry in the context of minimal and non-minimal gravity-bulk scalar couplings. © 2014 Chinese Physical Society and IOP Publishing Ltd. © 2014 Elsevier B.V. All rights reserved.Article Integrated Lax formalism for principal chiral model(Amer Inst Physics, 2010) Nejat Tevfik Yilmaz; Yilmaz, Nejat T.By solving the first-order algebraic field equations which arise in the dual formulation of the D=2 principal chiral model (PCM) we construct an integrated Lax formalism built explicitly on the dual fields of the model rather than the currents. The Lagrangian of the dual scalar field theory is also constructed. Furthermore we present the first-order partial differential equation (PDE) system for an exponential parametrization of the solutions and discuss the integrability of this system. © 2010 American Institute of Physics. © 2010 Elsevier B.V. All rights reserved.Article Effective fluid FLRW cosmologies of minimal massive gravity(WORLD SCIENTIFIC PUBL CO PTE LTD, 2015) Nejat Tevfik YilmazBy using a solution ansatz we partially decouple the metric and the Stuckelberg sectors of the minimal massive gravity (MMGR). In this scheme for a diagonal physical metric we find the general solutions for the scalars of the theory and the particular fiducial (background) metric which leads to these solutions. Then we adopt this general formalism to construct the derivation of new Friedmann-Lemaitre-Robertson-Walker (FLRW) cosmologies of the theory in the presence of a so-called effective ideal fluid which arises from our solution ansatz as a modifying non-physical source for the Einstein and the corresponding Friedmann equations.Article Decoupling solution moduli of bigravity(ELSEVIER SCIENCE BV, 2016) Nejat Tevfik YilmazA complete classification of exact solutions of ghost-free massive bigravity is derived which enables the dynamical decoupling of the background and the foreground metrics. The general decoupling solution space of the two metrics is constructed. Within this branch of the solution space the foreground metric theory becomes general relativity (GR) with an additional effective cosmological constant and the background metric dynamics is governed by plain GR. (C) 2016 Elsevier B.V. All rights reserved.Article Citation - WoS: 1Effective fluid FLRW cosmologies of minimal massive gravity(World Scientific, 2015) Nejat Tevfik Yilmaz; Yilmaz, Nejat TevfikBy using a solution ansatz we partially decouple the metric and the Stückelberg sectors of the minimal massive gravity (MMGR). In this scheme for a diagonal physical metric we find the general solutions for the scalars of the theory and the particular fiducial (background) metric which leads to these solutions. Then we adopt this general formalism to construct the derivation of new Friedmann-Lemaitre-Robertson-Walker (FLRW) cosmologies of the theory in the presence of a so-called effective ideal fluid which arises from our solution ansatz as a modifying non-physical source for the Einstein and the corresponding Friedmann equations. © 2021 Elsevier B.V. All rights reserved.Article Cosmological solution moduli of bigravity(Institute of Physics Publishing michael.roberts@iop.org, 2015) Nejat Tevfik YilmazWe construct the complete set of metric-configuration solutions of the ghost-free massive bigravity for the scenario in which the g-metric is the Friedmann-Lemaitre-Robertson-Walker (FLRW) one and the interaction Lagrangian between the two metrics contributes an effective ideal fluid energy-momentum tensor to the g-metric equations. This set corresponds to the exact background cosmological solution space of the theory. © 2015 Elsevier B.V. All rights reserved.Article Citation - WoS: 2Citation - Scopus: 2Effective matter cosmologies of massive gravity: Physical fluids(American Physical Society revtex@aps.org, 2014) Nejat Tevfik Yilmaz; Yilmaz, Nejat TevfikWe derive new cosmological solutions of the ghost-free massive gravity with a general background metric in which the contribution of the mass sector to the metric one is modeled by an effective cosmological constant and an ideal fluid which obeys the first law of thermodynamics, thus it satisfies the ordinary energy-momentum conservation or continuity equation. © 2020 Elsevier B.V. All rights reserved.
