Zobrazeno 1 - 10
of 28
pro vyhledávání: '"Khaled Saaidi"'
Autor:
Haidar Sheikhahmadi, Abolhassan Mohammadi, Ali Aghamohammadi, Tiberiu Harko, Ramón Herrera, Christian Corda, Amare Abebe, Khaled Saaidi
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 79, Iss 12, Pp 1-17 (2019)
Abstract We investigate warm inflationary scenario in which the accelerated expansion of the early Universe is driven by chameleon-like scalar fields. Due to the non-minimal coupling between the scalar field and the matter sector, the energy-momentum
Externí odkaz:
https://doaj.org/article/3a310fa1f02e44d6a1d97eac4e25a4b9
Publikováno v:
Physics Letters B, Vol 749, Iss C, Pp 231-235 (2015)
In this work, the effects of non-commutative and commutative vacua on the phase space generated by a scalar field in a scalar torsion scenario are investigated. For both classical and quantum regimes, the commutative and non-commutative cases are com
Externí odkaz:
https://doaj.org/article/1eda5f40f3d043918b6fce5a2ba85f77
Publikováno v:
Advances in High Energy Physics, Vol 2016 (2016)
During this work, using subtraction renormalization mechanism, zero point quantum fluctuations for bosonic scalar fields in a de-Sitter like background are investigated. By virtue of the observed value for spectral index, ns(k), for massive scalar fi
Externí odkaz:
https://doaj.org/article/3b1ec99fe6a0454a9ad529d81888dc0b
Autor:
Abolhassan Mohammadi, Tayeb Golanbari, Jamil Enayati, Shahram Jalalzadeh, Salah Nasri, Khaled Saaidi
Publikováno v:
International Journal of Modern Physics D. 31
The slow-roll inflation scenario is studied in the frame of the scalar–tensor theory of gravity, where the scalar field has a nonminimal coupling to the geometric part. After deriving the main dynamical and observable parameter, the consistency of
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5389b728271c0383119e5e58a2b8e7a0
https://doi.org/10.1142/s0218271822500791
https://doi.org/10.1142/s0218271822500791
Publikováno v:
Physical Review D. 101
The scenario of constant-roll inflation in the frame of the Randall-Sundraum II (RS II) brane gravity model is considered. Based on the scenario, the smallness of the second slow-roll parameter is released and it is assumed as a constant which could
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6b25789455b0220814ffd55bf8648a64
https://doi.org/10.1103/physrevd.101.123537
https://doi.org/10.1103/physrevd.101.123537
We consider inflation in a five -dimensional space time with the inflaton field confined to live on a brane world. In this scenario, we study different types of potentials for the inflaton, discuss their observational consequences, and compare with d
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::80e11c3cea9a0522e09d7ec1b979cecb
http://arxiv.org/abs/2006.09489
http://arxiv.org/abs/2006.09489
Autor:
Mariwan A. Rasheed, T. Golanbari, A. Mohammadi, K. Sayar, L. Akhtari, Khaled Saaidi, Haidar Sheikhahmadi
The scenario of two components warm tachyon inflation is considered where the tachyon field plays the role of inflaton and drives inflation. During inflation, the tachyon scalar field interacts with the other component of the Universe which is consid
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::825f65b1dc5f4aba0b7f7ed8c1d4cd8c
Autor:
Ramón Herrera, A. Mohammadi, Haidar Sheikhahmadi, Christian Corda, Amare Abebe, Khaled Saaidi, Tiberiu Harko, Ali Aghamohammadi
Publikováno v:
European Physical Journal
European Physical Journal C: Particles and Fields, Vol 79, Iss 12, Pp 1-17 (2019)
European Physical Journal C: Particles and Fields, Vol 79, Iss 12, Pp 1-17 (2019)
We investigate warm inflationary scenario in which the accelerated expansion of the early Universe is driven by chameleon-like scalar fields. Due to the non-minimal coupling between the scalar field and the matter sector, the energy-momentum tensor o
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9fcd5eeada3645cfe8b782e291b81cb8
http://repo.scoap3.org/api
http://repo.scoap3.org/api
The beta function formalism is being used to study the constant-roll inflation in the k-essence model. Assuming the second slow-roll parameter as a constant leads to a first-order differential equation for $\beta$-function which is much easier to sol
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4c15dc78d407b9c884420fba38342a12
http://arxiv.org/abs/1912.07006
http://arxiv.org/abs/1912.07006
Publikováno v:
Physical Review D. 100
The scenario of constant-roll inflation is studied where the inflaton is a scalar field with modified kinetic term, known as non-canonical scalar field. This modification leads to some changes in the slow-roll parameters, and also by taking the secon
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::611f47a77cd8b7ca3954b589e579fa64
https://doi.org/10.1103/physrevd.100.083520
https://doi.org/10.1103/physrevd.100.083520