156 citations · 1.1k across the 74 of their papers we have counts for
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Detectability of 21-cm Power Spectra from the Epoch of Reionization using Modern Radio Telescopes
Ali Bagheri Koochaksaraei, Lily Mobahat, Sara Gholamhosseinian +1
One of the unsolved questions in astrophysics and cosmology is the development of a robust physical model to explain the thermal history of the intergalactic medium during the epoc…
When Dark Energy Turns On: Constraints on a Critical Emergence Model
Mahdi Najafi, Mahdi Habibollahi, Masoume Reyhani +4
We investigate a specific emergent dark energy scenario, known as critically emergent dark energy (CEDE), in which dark energy is effectively absent in the early Universe and becom…
A Multi-Probe ISW Study of Dark Energy Models with Negative Energy Density: Galaxy Correlations, Lensing Bispectrum, and Planck ISW-Lensing Likelihood
Payam Ghafari, Mahdi Najafi, Mina Ghodsi Yengejeh +3
We investigate the late-time imprints of three dark energy (DE) models, namely, the Chevallier-Polarski-Linder (CPL) parametrization, CDM, and an Omnipotent DE model, on…
Dynamical dark energy confronted with multiple CMB missions
Mahdi Najafi, Supriya Pan, Eleonora Di Valentino +1
The measurements of the cosmic microwave background (CMB) have played a significant role in understanding the nature of dark energy. In this article, we investigate the dynamics of…
Robust Preference for Dynamical Dark Energy in DESI BAO and SN Measurements
William Giarè, Mahdi Najafi, Supriya Pan +2
Recent Baryon Acoustic Oscillation (BAO) measurements released by DESI, when combined with Cosmic Microwave Background (CMB) data from Planck and two different samples of Type Ia s…
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…
Structure Formation in Various Dynamical Dark Energy Scenarios
Masoume Reyhani, Mahdi Najafi, Javad T. Firouzjaee +1
This research investigates the impact of the nature of Dark Energy (DE) on structure formation, focusing on the matter power spectrum and the Integrated Sachs-Wolfe effect (ISW). B…
SVR Algorithm as a Tool for More Optimal Intergalactic Medium Simulation in the Epoch of Reionization
Mahsa Berahman, Seyed Sajad Tabasi, Javad T. Firouzjaee +1
All kinds of simulations of the intergalactic medium, such as hydrodynamic simulation, N-body simulation, numerical and semi-numerical simulation, etc., have been used to realize t…
A New Constraint on the Simulation of the Intergalactic Medium through the Evolution of the Neutral Hydrogen Fraction in the Epoch of Reionization
S. Mobina Hosseini, Bahareh Soleimanpour Salmasi, Seyed Sajad Tabasi +1
The thermal history of the intergalactic medium is full of extremely useful data in the field of astrophysics and cosmology. In other words, by examining this environment in differ…
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…
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.…
New Accretion Constraint on the Evaporation of Primordial Black Holes
Seyed Sajad Tabas, Mahsa Berahman, Javad T. Firouzjaee
In this paper, we have investigated the processes of evaporation and accretion of primordial black holes during the radiation-dominated era and the matter-dominated era. This subje…
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…
A new constraint on the Hawking evaporation of primordial black holes in the radiation-dominated era
Seyed Sajad Tabasi, Javad T. Firouzjaee
In this paper, we revisit the evaporation and accretion of primordial black holes (PBHs) during cosmic history and compare them to see if both of these processes are constantly act…
Searching for the hydrogen 21 cm line in cosmos
Mahta Moazzenzadeh, Javad T. Firouzjaee
It is widely agreed that studying the 21 cm emission line from neutral hydrogen may be our best hope for understanding the creation of the first structures during the dark ages and…
The Integrated Sachs-Wolfe Effect in 4D Einstein-Gauss-Bonnet Gravity
Mina Ghodsi Y., Aryan Behnamfard, Saeed Fakhry +1
A novel 4-dimensional Einstein-Gauss-Bonnet (4D EGB) gravity has been proposed that asserts to bypass the Lovelock's theorem and to result in a non-trivial contribution to the grav…
Primordial Black Hole Merger Rate in Self-Interacting Dark Matter Halo Models
Saeed Fakhry, Mahdi Naseri, Javad T. Firouzjaee +1
We study the merger rate of primordial black holes (PBHs) in self-interacting dark matter (SIDM) halo models. To explore a numerical description for the density profile of SIDM hal…
Primordial Black Hole Merger Rate in Ellipsoidal-Collapse Dark Matter Halo Models
Saeed Fakhry, Javad T. Firouzjaee, Mehrdad Farhoudi
We have studied the merger rate of primordial black holes (PBHs) in the ellipsoidal-collapse model of halo to explain the dark matter abundance by the PBH merger estimated from the…
Examining the end of inflation with primordial black holes mass distribution and gravitational waves
Amjad Ashoorioon, Abasalt Rostami, Javad T. Firouzjaee
We explicitly construct a double-field inflationary model, which satisfies the latest Planck constraints at the cosmic microwave background (CMB) scales and produces the whole dark…
Super Interacting Dark Sector: An Improvement on Self-Interacting Dark Matter via Scaling Relations of Galaxy Clusters
Mahdi Naseri, Javad T. Firouzjaee
Self-interacting dark matter is known as one of the most appropriate candidates for dark matter. Due to its excellent success in removing many astrophysical problems, particularly…
The Effect of Interacting Dark Energy on Mass-Temperature Relation in Galaxy Clusters
Mahdi Naseri, Javad T. Firouzjaee
There are a variety of cosmological models for dark matter and dark energy in which a possible interaction is considered between these two significant components of the universe. W…
EFT Compatible PBHs: Effective Spawning of the Seeds for Primordial Black Holes during Inflation
Amjad Ashoorioon, Abasalt Rostami, Javad T. Firouzjaee
Most of the inflationary scenarios that try to explain the origin of Primordial Black Holes (PBHs) from the enhancements of the power spectrum to values of order one, at the releva…
Black hole shadow with a cosmological constant for cosmological observers
Javad T. Firouzjaee, Alireza Allahyari
We investigate the effect of the cosmological constant on the angular size of a black hole shadow. It is known that the accelerated expansion which is created by the cosmological c…