Zobrazeno 1 - 10
of 4 238
pro vyhledávání: '"H. Mohseni"'
Autor:
Sadjadi, H. Mohseni
Publikováno v:
Phys. Lett. B 857,138967(2024)
We present a model in which the Gauss-Bonnet invariant holds the quintessence at a fixed point, respecting an initial $Z_2$ symmetry in the radiation-dominated era. This results in an early dark energy that becomes significant around the matter-radia
Externí odkaz:
http://arxiv.org/abs/2404.19695
Autor:
Sadjadi, H. Mohseni
We consider a model consisting of a quintessence coupled to the Ricci scalar and the Gauss-Bonnet invariant. We propose a mechanism for the rising of dark energy in the matter era, alleviating the coincidence problem. The role of the Gauss-Bonnet inv
Externí odkaz:
http://arxiv.org/abs/2310.03697
Autor:
Sadjadi, H. Mohseni
Publikováno v:
Phys. Lett. B 850, 138508 (2024)
We introduce a dynamical dark energy model wherein quintessence interacts with both the Gauss-Bonnet invariant and dark matter. Initially, the Gauss-Bonnet invariant stabilizes the quintessence at a fixed point, resulting in a negligible density of d
Externí odkaz:
http://arxiv.org/abs/2309.07816
Autor:
H. Mohseni Sadjadi
Publikováno v:
Physics Letters B, Vol 857, Iss , Pp 138967- (2024)
We present a model in which the Gauss-Bonnet invariant holds the quintessence at a fixed point, respecting an initial Z2 symmetry in the radiation-dominated era. This results in an early dark energy that becomes significant around the matter-radiatio
Externí odkaz:
https://doaj.org/article/285f8fe83c7940b0aab07c2019a12b14
A vector field is assumed to be conformally coupled to the matter components through a screening mechanism. The matter density implicitly affects the neutrino flavor transitions through the vector field. We study the neutrino-vector field interaction
Externí odkaz:
http://arxiv.org/abs/2209.13367
Autor:
Sadjadi, H. Mohseni, Anari, V.
Publikováno v:
Eur. Phys. J. Plus 138, 84 (2023)
In the early Universe, dark energy may have a non-negligible contribution. If this dark energy corresponds to an early cosmological constant, it leads to a late-time huge dark energy density which is much larger than what is expected for the current
Externí odkaz:
http://arxiv.org/abs/2205.15693
Autor:
Anari, V., Sadjadi, H. Mohseni
Publikováno v:
JCAP07(2022)043
We propose a model to describe the late-time cosmic acceleration in the context of the constant-roll model. By considering a coupling between massive neutrinos and the quintessence, the onset of evolution of the quintessence is related to the neutrin
Externí odkaz:
http://arxiv.org/abs/2203.02467
Publikováno v:
Phys. Lett. B 850, 138493 (2024)
A modified version of the MSW effect is studied within the framework of screening models through conformal couplings of a scalar field within matter. Such a coupling leads to a new, unknown interaction between the scalar field and the neutrino. We ma
Externí odkaz:
http://arxiv.org/abs/2201.02927
Publikováno v:
Phys. Dark Univ. 37, 101067 (2022)
In screening models with scalar-matter conformal coupling, we study the flavor transition of neutrinos. We employ an analytical method for studying the oscillation phase in a spherically symmetric spacetime filled by a scalar field. Since the ambient
Externí odkaz:
http://arxiv.org/abs/2111.03054
Publikováno v:
Physics Letters B, Vol 850, Iss , Pp 138493- (2024)
A modified version of the MSW effect is studied within the framework of screening models through conformal couplings of a scalar field within matter. Such a coupling leads to a new, unknown interaction between the scalar field and the neutrino. We ma
Externí odkaz:
https://doaj.org/article/c872cdb1e5a248b79126e7aada1d5bf0