Scalar perturbations in cosmological f(R) models: the cosmic screening approach

Özgür Akarsu; Ruslan Brilenkov; Maxim Eingorn; Valerii Shulga; Alexander Zhuk

doi:10.1140/epjc/s10052-018-6091-7

Scalar perturbations in cosmological f(R) models: the cosmic screening approach

Özgür Akarsu^*
, Ruslan Brilenkov
, Maxim Eingorn
, Valerii Shulga
, Alexander Zhuk

^*Bu çalışma için yazışmadan sorumlu yazar

Fizik Mühendisliği Bölümü

University of Innsbruck
University of Rome Tor Vergata
University of Göttingen
North Carolina Central University
Jilin University
NASU - Institute of Radio Astronomy
Istanbul Technical University
Odessa National University

Araştırma sonucu: Dergiye katkı › Makale › bilirkişi

8 Atıf (Scopus)

Özet

We investigate cosmological perturbations for nonlinear f(R) models within the cosmic screening approach. Matter is considered both in the form of a set of discrete point-like massive bodies and in the form of a continuous pressureless perfect fluid. We perform full relativistic analysis of the first-order theory of scalar perturbations for arbitrary nonlinear f(R) models and demonstrate that scalar potentials Φ(t, r) and Ψ(t, r) are determined by a system of only two master equations. Our equations are applicable at all spatial scales as long as the approximation δR/ R¯ ≪ 1 (which is usually assumed in studies devoted to cosmological perturbations in f(R) models) works.

Orijinal dil	İngilizce
Makale numarası	609
Dergi	European Physical Journal C
Hacim	78
Basın numarası	8
DOI'lar	https://doi.org/10.1140/epjc/s10052-018-6091-7
Yayın durumu	Yayınlandı - 1 Ağu 2018

Bibliyografik not

Publisher Copyright:
© 2018, The Author(s).

Finansman

Acknowledgements ÖA acknowledges support by the Distinguished Young Scientist Award BAGEP of the Science Academy. AZ acknowledges financial support from The Scientific and Technological Research Council of Turkey (TUBITAK) in the scheme of Fellowships for Visiting Scientists and Scientists on Sabbatical Leave (BIDEB 2221). AZ also acknowledges the hospitality of Istanbul Technical University (ITU) where parts of this work were carried out. The work of RB was partially supported by the EMJMD Student Scholarship from Erasmus + : Erasmus Mundus Joint Master Degree programme Astro-Mundus in Astrophysics.

Finansörler	Finansör numarası
TUBITAK	BIDEB 2221
Türkiye Bilimsel ve Teknolojik Araştirma Kurumu
Bilim Akademisi

Belgeye Erişim

10.1140/epjc/s10052-018-6091-7

Diğer Dosyalar ve Linkler

Link to publication in Scopus

Alıntı Yap

@article{83f9b270bf6e4a53a47e3b2868f299ab,

title = "Scalar perturbations in cosmological f(R) models: the cosmic screening approach",

abstract = "We investigate cosmological perturbations for nonlinear f(R) models within the cosmic screening approach. Matter is considered both in the form of a set of discrete point-like massive bodies and in the form of a continuous pressureless perfect fluid. We perform full relativistic analysis of the first-order theory of scalar perturbations for arbitrary nonlinear f(R) models and demonstrate that scalar potentials Φ(t, r) and Ψ(t, r) are determined by a system of only two master equations. Our equations are applicable at all spatial scales as long as the approximation δR/ R¯ ≪ 1 (which is usually assumed in studies devoted to cosmological perturbations in f(R) models) works.",

author = "{\"O}zg{\"u}r Akarsu and Ruslan Brilenkov and Maxim Eingorn and Valerii Shulga and Alexander Zhuk",

note = "Publisher Copyright: {\textcopyright} 2018, The Author(s).",

year = "2018",

month = aug,

day = "1",

doi = "10.1140/epjc/s10052-018-6091-7",

language = "English",

volume = "78",

journal = "European Physical Journal C",

issn = "1434-6044",

number = "8",

}

TY - JOUR

T1 - Scalar perturbations in cosmological f(R) models

T2 - the cosmic screening approach

AU - Akarsu, Özgür

AU - Brilenkov, Ruslan

AU - Eingorn, Maxim

AU - Shulga, Valerii

AU - Zhuk, Alexander

PY - 2018/8/1

Y1 - 2018/8/1

N2 - We investigate cosmological perturbations for nonlinear f(R) models within the cosmic screening approach. Matter is considered both in the form of a set of discrete point-like massive bodies and in the form of a continuous pressureless perfect fluid. We perform full relativistic analysis of the first-order theory of scalar perturbations for arbitrary nonlinear f(R) models and demonstrate that scalar potentials Φ(t, r) and Ψ(t, r) are determined by a system of only two master equations. Our equations are applicable at all spatial scales as long as the approximation δR/ R¯ ≪ 1 (which is usually assumed in studies devoted to cosmological perturbations in f(R) models) works.

AB - We investigate cosmological perturbations for nonlinear f(R) models within the cosmic screening approach. Matter is considered both in the form of a set of discrete point-like massive bodies and in the form of a continuous pressureless perfect fluid. We perform full relativistic analysis of the first-order theory of scalar perturbations for arbitrary nonlinear f(R) models and demonstrate that scalar potentials Φ(t, r) and Ψ(t, r) are determined by a system of only two master equations. Our equations are applicable at all spatial scales as long as the approximation δR/ R¯ ≪ 1 (which is usually assumed in studies devoted to cosmological perturbations in f(R) models) works.

UR - https://www.scopus.com/pages/publications/85050733063

U2 - 10.1140/epjc/s10052-018-6091-7

DO - 10.1140/epjc/s10052-018-6091-7

M3 - Article

AN - SCOPUS:85050733063

SN - 1434-6044

VL - 78

JO - European Physical Journal C

JF - European Physical Journal C

IS - 8

M1 - 609

ER -

Scalar perturbations in cosmological f(R) models: the cosmic screening approach

Özet

Bibliyografik not

Finansman

Belgeye Erişim

Diğer Dosyalar ve Linkler

Parmak izi

Alıntı Yap