Zobrazeno 1 - 10
of 104
pro vyhledávání: '"M Koussour"'
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 84, Iss 7, Pp 1-11 (2024)
Abstract In this study, we investigate signature flips within the framework of cosmological models featuring a time-varying vacuum energy term $$\Lambda (t)$$ Λ ( t ) . Specifically, we consider the power-law form of $$\Lambda =\alpha H^n$$ Λ = α
Externí odkaz:
https://doaj.org/article/a1795f8e50c14128b4f5f16224245492
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 83, Iss 9, Pp 1-17 (2023)
Abstract This paper investigate the impacts of local density perturbations on the stability of self-gravitating compact objects by utilizing cracking technique within the context of f(R, T) gravity, where R and T represent the Ricci scalar, and the t
Externí odkaz:
https://doaj.org/article/4afdb9ffa0724e29bc0559728351f330
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 83, Iss 8, Pp 1-15 (2023)
Abstract In this work, we have studied the quasinormal modes of a black hole in a model of the type $$f(Q)=\underset{n}{\sum }a_{n}\left( Q-Q_{0}\right) ^{n} $$ f ( Q ) = ∑ n a n Q - Q 0 n in f(Q) gravity by using a recently introduced method known
Externí odkaz:
https://doaj.org/article/448b025eaead45ae85499f258f777254
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 83, Iss 7, Pp 1-14 (2023)
Abstract We propose a logarithmic parametrization form of energy density for the scalar field dark energy in the framework of the standard theory of gravity, which supports the necessary transition from the decelerated to the accelerated behavior of
Externí odkaz:
https://doaj.org/article/312f541a69494a269eafeb3ff7c582f0
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 83, Iss 7, Pp 1-12 (2023)
Abstract In this paper, we propose a new parametrization of dark energy based on the Om(z) diagnostic tool behavior. For this purpose, we investigate a functional form of the Om(z) that predicts the popular dark energy dynamical models, namely phanto
Externí odkaz:
https://doaj.org/article/3d8e9c6314b247c2b8223a48e3e9cadc
Autor:
M. Koussour, Avik De
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 83, Iss 5, Pp 1-15 (2023)
Abstract In the past few years, f(Q) theories have drawn a lot of research attention in replacing Einstein’s theory of gravity successfully. The current study examines the novel cosmological possibilities emerging from two specific classes of f(Q)
Externí odkaz:
https://doaj.org/article/b21bb941abab461cbae67a30edf73e46
A comprehensive parametrization approach for the Hubble parameter in scalar field dark energy models
Publikováno v:
Results in Physics, Vol 55, Iss , Pp 107166- (2023)
This study proposes a novel parametrization approach for the dimensionless Hubble parameter i.e. E2(z)=A(z)+β(1+γB(z)) in the context of scalar field dark energy models. The parametrization is characterized by two functions, A(z) and B(z), carefull
Externí odkaz:
https://doaj.org/article/260f4883e5344f7ead539b5a4915d6b2
Publikováno v:
Nuclear Physics B, Vol 992, Iss , Pp 116233- (2023)
In this paper, we have presented an accelerating cosmological model of the Universe in an extended symmetric teleparallel gravity or f(Q,T) gravity. The parametric form of the Hubble parameter is, H(z)=H0[α+(1−α)(1+z)n]32n, where H0 and n are con
Externí odkaz:
https://doaj.org/article/b17d0cd9a79841c282835a383a8a8217
Publikováno v:
Nuclear Physics B, Vol 990, Iss , Pp 116158- (2023)
On the basis of homogeneous and isotropic Friedmann-Lemaitre-Robertson-Walker (FLRW) geometry, solutions to the issues of cosmic acceleration and dark energy are being put forth within the context of f(Q) gravity. We take into account a power law f(Q
Externí odkaz:
https://doaj.org/article/e7c0f6110a3e4fe8aaba668a33dc2d9a
Publikováno v:
Frontiers in Astronomy and Space Sciences, Vol 9 (2022)
The existing analysis reports a reconstruction scheme of the newly proposed gravity say f(Q) gravity through the scale factor of the form a(t)=a0tn=11+z by describing the power-law cosmology. The reconstructed f(Q) gravity models disclosed how this m
Externí odkaz:
https://doaj.org/article/1b5c91c6ffc149c096dc23042d5d0116