20 citations · 43 across the 12 of their papers we have counts for
12 papers
Neutron stars with primary scalar hair
Hamza Boumaza, Christos Charmousis, David Langlois +1
We investigate static and spherically symmetric neutron star solutions endowed with primary scalar hair in a subfamily of Degenerate-Higher-Order-Scalar-Tensor (DHOST) theories of…
Axial Quasi-normal Modes of Boson-Fermion Stars
Hamza Boumaza, Boris Betancourt Kamenetskaia
We study axial quasi-normal modes of boson-fermion stars composed of ordinary nuclear matter and a self-interacting bosonic dark matter component. The equilibrium configurations ar…
Radial Oscillations of Neutron Stars with Vector-Induced Scalar Hair
Hamza Boumaza
In this paper, we investigate the equilibrium configurations and radial perturbations of neutron stars within a subclass of gauge-invariant Scalar-Vector-Tensor (SVT) theories. By…
Neutron stars in degenerate higher-order scalar-tensor theories: Axial perturbations
Hamza Boumaza, David Langlois
We study the axial (or odd-parity) perturbations of neutron stars in a one-parameter subclass of Degenerate Higher-Order Scalar-tensor (DHOST) theories. After recalling the equilib…
Scalar quasinormal modes of gravastars
Hamza Boumaza
In this work, we present a detailed investigation of gravastars within the framework of scalar-tensor theories, emphasizing both the background and perturbed levels for trivial and…
Neutron Stars in Scalar Torsion Theories with Nonminimal Coupling
Youcef Kehal, Khireddine Nouicer, Hamza Boumaza
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 non-minimally co…
Axial and polar stability of neutron stars in scalar-tensor theories with disformal coupling
Hamza Boumaza
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 gravi…
Neutron stars in degenerate higher-order scalar-tensor theories
Hamza Boumaza, David Langlois
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)…
Axial perturbations of neutron stars with shift symmetric conformal coupling
Hamza Boumaza
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 de…
Tidal love number of neutron stars with conformal coupling
Hamza Boumaza
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…
Late time cosmological evolution in DHOST models
Hamza Boumaza, David Langlois, Karim Noui
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 Scal…
Growth of Matter Perturbations in the Bi-Galileons Field Model
Hamza Boumaza, Khireddine Nouicer
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 dyna…