Zobrazeno 1 - 10
of 39
pro vyhledávání: '"Sahlu, Shambel"'
This paper investigates the impact of the effects of bulk viscosity on the accelerating expansion and large-scale structure formation of a universe in which the underlying gravitational interaction is described by $f(Q)$ gravity. Various toy models o
Externí odkaz:
http://arxiv.org/abs/2408.02775
This paper delves into the late-time accelerated expansion of the universe and the evolution of cosmic structures within the context of a specific \( f(R, L_m) \) gravity model, formulated as \( f(R, L_m) = \lambda R + \beta L_m^\alpha + \eta \). To
Externí odkaz:
http://arxiv.org/abs/2406.08303
We take into account redshift-space distortion measurements to investigate the growth of cosmological large-scale structures within the framework of modified symmetric teleparallel $f(Q)$ gravity. After comparing the predictions of the $f(Q)$-gravity
Externí odkaz:
http://arxiv.org/abs/2405.07361
Autor:
Sahlu, Shambel, Tsegaye, Endalkachew
In this manuscript, we studied the accelerated expansion history of the universe and the formations of large-scale structures using $f(Q)$ gravity model. The expansion rate of the universe within distance modulus and redshift has been performed in $f
Externí odkaz:
http://arxiv.org/abs/2206.02517
In this paper, we undertake a unified study of background dynamics and cosmological perturbations in the presence of the Chaplygin gas. This is done by first constraining the background cosmological parameters of different Chaplygin gas models with S
Externí odkaz:
http://arxiv.org/abs/2112.11695
We investigate classes of shear-free cosmological dust models with irrotational fluid flows within the framework of $f(T)$ gravity. In particular, we use the $1 + 3$ covariant formalism and present the covariant linearised evolution and constraint eq
Externí odkaz:
http://arxiv.org/abs/2105.00646
In this paper the scalar-tensor theory is applied to the study of perturbations in a multi-fluid universe, using the 1+3 covariant approach. Both scalar and harmonic decompositions are instituted on the perturbation equations. In particular, as an ap
Externí odkaz:
http://arxiv.org/abs/2011.13198
Publikováno v:
SAIP2019 Proceedings
In this paper we study the perturbations of a cosmic multi-fluid medium consisting of radiation, dust and a Chaplygin gas. To do so, we follow the 1 + 3 covariant formalism and derive the evolution equations of the fluctuations in the energy density
Externí odkaz:
http://arxiv.org/abs/2010.05173
Publikováno v:
Proc. IAU 15 (2019) 397-399
This paper studies the cosmology of accelerating expansion of the universe in modified teleparallel gravity theory. We discuss the cosmology of $f(T,B)$ gravity theory and its implication to the new general form of the equation of state parameter $w_
Externí odkaz:
http://arxiv.org/abs/2003.10908
Autor:
Sahlu, Shambel, Ntahompagaze, Joseph, Abebe, Amare, de la Cruz-Dombriz, Alvaro, Mota, David F.
The cosmological scalar perturbations of standard matter are investigated in the context of extended teleparallel $f(T)$ gravity theories using the $1+3$ covariant formalism. After a review of the background, gravitational field equations of $f(T)$ g
Externí odkaz:
http://arxiv.org/abs/1907.03563