Zobrazeno 1 - 10
of 25
pro vyhledávání: '"Boumaza, Hamza"'
We study the existence and structure of static and slowly rotating neutron stars (NSs) in a particular truncation of scalar torsion theory with a scalar field $ \phi $ non-minimally coupled to the torsion scalar, and a potential of the form $ V(\phi)
Externí odkaz:
http://arxiv.org/abs/2305.12155
Autor:
Boumaza, Hamza
In the present work, we study the radial and non-radial perturbative stability of neutron stars in which the matter is disformally coupled to the metric. First, we derive the gravitational and the fluid equations of the neutron star in a static and s
Externí odkaz:
http://arxiv.org/abs/2303.16664
Autor:
Boumaza, Hamza, Langlois, David
We study neutron star configurations in a simple shift-symmetric subfamily of degenerate higher-order scalar-tensor (DHOST) theories, whose deviations from General Relativity (GR) are characterized by a single parameter. We compute the radial profile
Externí odkaz:
http://arxiv.org/abs/2207.13624
Autor:
Boumaza, Hamza
In this present work, the axial quasi-normal modes of neutron stars, with a shift symmetric conformal coupling, are studied for different realistic equations of state. First, we derive the background equations in static and spherically symmetric spac
Externí odkaz:
http://arxiv.org/abs/2110.14480
Autor:
Boumaza, Hamza
Publikováno v:
Phys. Rev. D 104, 084098 (2021)
In this present work, we suggest studying neutron star with a conformal coupling by using the analytical expressions of realistic equations of state. The equations of perturbed and nonperturbed metrics, scalar field and the pressure of the matter are
Externí odkaz:
http://arxiv.org/abs/2107.09837
Publikováno v:
Phys. Rev. D 102, 024018 (2020)
We study the late cosmological evolution, from the nonrelativistic matter dominated era to the dark energy era, in modified gravity models described by Degenerate Higher-Order Scalar-Tensor (DHOST) theories. They represent the most general scalar-ten
Externí odkaz:
http://arxiv.org/abs/2004.10260
Autor:
Boumaza, Hamza, Nouicer, Khireddine
Publikováno v:
Phys. Rev. D 100, 124047 (2019)
We study a dark energy cubic bi-Galileons field model based on truncation of the recently proposed generalized covariant multi-Galileons model. We investigate the cosmological dynamic of the model by the theory of dynamical systems through the analys
Externí odkaz:
http://arxiv.org/abs/1909.07504
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Autor:
Boumaza, Hamza1 (AUTHOR) boumaza14@yahoo.com
Publikováno v:
European Physical Journal C -- Particles & Fields. May2021, Vol. 81 Issue 5, p1-13. 13p.
Akademický článek
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