88 citations · 389 across the 30 of their papers we have counts for
32 papers
Black Hole Shadows and Quasinormal Modes with Dark Matter at the Horizon
Armin Sadeghi, Javad T. Firouzjaee, Saeed Fakhry
In this work, we study the effect of a surrounding dark matter halo on two horizon-scale observables of a black hole: its shadow and quasinormal-mode spectrum. We consider a Schwar…
Scalar-Assisted Growth of Supermassive Black Holes: Boson-Mass Windows and Observational Constraints
Jorge Castelo Mourelle, Darío Núñez Zúñiga, Saeed Fakhry +1
We study a phenomenological cosmological model of black-hole growth in which a finite baryonic reservoir and a bosonic scalar cloud feed the black hole simultaneously. The baryonic…
Primordial Black Hole Seeds for Little Red Dots in Gravity
Saeed Fakhry
The discovery by the James Webb Space Telescope (JWST) of an abundant population of compact little red dots (LRDs) and supermassive black holes at high redshifts poses a severe tim…
Dark-to-black super-accretion as a spin-imprinting mechanism for supermassive Kerr black holes
Saeed Fakhry, Nicolas Sanchis-Gual, Jorge Castelo Mourelle +2
The existence of supermassive black holes with masses and large dimensionless spins at high redshift remains a challenge to our understand…
Cosmological Inflation in f(R,T) Gravity with Chern-Simons Correction
Maryam Shiravand, Saeed Fakhry, Mehrdad Farhoudi
We investigate cosmological inflation within the framework of a linear form of f (R, T ) gravity that incorporates an inflaton scalar field augmented by a Chern-Simons correction i…
Rotating Fermion-Boson Stars in -squared Gravity
Saeed Fakhry, Jorge Castelo Mourelle, Nicolas Sanchis-Gual +3
Fermion-boson stars are compact equilibrium configurations composed of ordinary fermionic matter and a bosonic dark component interacting only through gravity. Such systems provide…
Luminosity-Temperature Relation as a Probe for Modified Gravity
Antonino Del Popolo, Saeed Fakhry, David F. Mota
We investigate the luminosity-temperature (-) relation of galaxy clusters as a probe for testing modified gravity (MG) theories, focusing on gravity and symmetron mode…
Cosmological Inflation in Gravity
Maryam Shiravand, Saeed Fakhry, Javad T. Firouzjaee +1
Cosmological inflation remains a key paradigm for explaining the earliest stages of the Universe, yet the theoretical limitations of General Relativity (GR) motivate the developmen…
Dynamical friction shear and rotation in Chaplygin cosmology
A. Del Popolo, Saeed Fakhry, Maryam Shiravand +1
In this study, we build upon the findings of Del Popolo et al. (2013) by further analyzing the influence of dynamical friction on the evolution of cosmological perturbations within…
Matching JWST UV Luminosity Functions with Refined CDM Halo Models
Saeed Fakhry, Maryam Shiravand, Antonino Del Popolo
The James Webb Space Telescope (JWST) has unveiled a population of unexpectedly massive and luminous galaxies at redshifts , posing a significant challenge to the stan…
High-redshift Galaxies from JWST Observations in More Realistic Dark Matter Halo Models
Saeed Fakhry, Reyhaneh Vojoudi Salmani, Javad T. Firouzjaee
The James Webb Space Telescope (JWST) has unveiled unexpectedly massive galaxy candidates at high redshifts, challenging standard CDM cosmological predictions. In this work, we…
Ultradense Dark Matter Halos with Poisson Noise from Stellar-Mass Primordial Black Holes
Saeed Fakhry, Javad T. Firouzjaee
In this work, we investigate the impact of Poisson noise from stellar-mass primordial black holes (PBHs) on the formation of ultradense dark matter halos (UDMHs). Our findings reve…
Toward Gravitational Lensing in Modified Theories of Gravity
Ali Tizfahm, Saeed Fakhry, Javad T. Firouzjaee +1
In this study, we investigate gravitational lensing within modified gravity frameworks, focusing on the Hu-Sawicki and normal branch Dvali-Gabadadze-Porrati (nDGP) models, a…
Compact Binary Merger Rate with Modified Gravity in Dark-Matter Spikes
Saeed Fakhry, Sara Gholamhoseinian, Marzieh Farhang
In this study, we investigate the impact of modified gravity on the merger rate of compact binaries within dark-matter spikes surrounding super-massive black holes (SMBHs). Specifi…
Gravitational Lensing in More Realistic Dark Matter Halo Models
Ali Tizfahm, Saeed Fakhry, Javad T. Firouzjaee +1
In this study, we explore gravitational lensing using more realistic dark matter halo models, moving beyond the limitations of spherical-collapse approximations. Through analytical…
Primordial Black Hole-Neutron Star Merger Rate in Modified Gravity
Saeed Fakhry, Maryam Shiravand, Marzieh Farhang
In this work we investigate the merger rate of primordial black hole-neutron star (PBH-NS) binaries in two widely-studied modified gravity (MG) models: Hu-Sawicki gravity an…
Toward More Realistic Mass Functions For Ultradense Dark Matter Halos
Saeed Fakhry, Marzieh Farhang, Antonino Del Popolo
Ultradense dark matter halos (UDMHs) are high concentrations of dark matter, assumed to have formed deep in the radiation-dominated era from amplified primordial perturbations. In…
Primordial Black Hole Merger Rate in Gravity
Saeed Fakhry
Primordial black holes (PBHs) are known as one of the potential candidates for dark matter. They are expected to have formed due to the direct gravitational collapse of density flu…
On the effect of angular momentum on the prompt cusp formation via the gravitational collapse
Antonino Del Popolo, Saeed Fakhry
In this work, we extend the model proposed by White concerning the post-collapse evolution of density peaks while considering the role of angular momentum. On a timescale smaller t…
Compact Binary Merger Rate in Dark-Matter Spikes
Saeed Fakhry, Zahra Salehnia, Azin Shirmohammadi +2
Nowadays, the existence of supermassive black holes (SMBHs) in the center of galactic halos is almost confirmed. An extremely dense region referred to as dark-matter spike is expec…
Effect of a High-Precision Semi-Analytical Mass Function on the Merger Rate of Primordial Black Holes in Dark Matter Halos
Saeed Fakhry, Antonino Del Popolo
In this work, we study the effect of a high-precision semianalytical mass function on the merger rate of primordial black holes (PBHs) in dark matter halos. For this purpose, we fi…
On the Merger Rate of Primordial Black Holes in Cosmic Voids
Saeed Fakhry, Seyed Sajad Tabasi, Javad T. Firouzjaee
Cosmic voids are known as underdense substructures of the cosmic web that cover a large volume of the Universe. It is known that cosmic voids contain a small number of dark matter…
The Merger Rate of Primordial Black Hole-Neutron Star Binaries in Ellipsoidal-Collapse Dark Matter Halo Models
Saeed Fakhry, Zahra Salehnia, Azin Shirmohammadi +1
Primordial black holes (PBHs), as a potential macroscopic candidate for dark matter, can encounter other compact objects in dark matter halos because of their random distribution.…
The Integrated Sachs-Wolfe Effect in Interacting Dark Matter-Dark Energy Models
Mina Ghodsi Yengejeh, Saeed Fakhry, Javad T. Firouzjaee +1
Interacting dark matter-dark energy (IDMDE) models can be taken to account as one of the present challenges that may affect the cosmic structures. In this work, we study the integr…