1.1k citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- Institute for Research in Fundamental SciencesIR578 papers
- Centre National de la Recherche ScientifiqueFR221 papers
- Istituto Nazionale di Fisica Nucleare, Sezione di NapoliIT204 papers
- California Institute of TechnologyUS193 papers
- The Ohio State UniversityUS193 papers
- University of WarsawPL190 papers
- Isfahan University of TechnologyIR188 papers
- TU WienAT172 papers
- Universität HamburgDE172 papers
- University of California, Santa BarbaraUS164 papers
- University of Notre DameUS162 papers
- Texas A&M UniversityUS161 papers
64 papers · 1 filter
Alleviating Cosmological Tensions with the Hadrosymmetric Twin Higgs
Mohammad Soroori Sotudeh, Zahra Davari, Sara Khatibi +1
The Hadrosymmetric Twin Higgs (HTH) model provides a natural solution to the little hierarchy problem by incorporating all three generations of quarks in a twin sector. Unlike othe…
Luminosity Function of Galaxies in Voids: A Modification Inspired by Excursion Set Theory
Zeynab Ashurikisomi, Shant Baghram
In the standard picture of cosmology, the galaxies reside in dark matter (DM) halos. DM halos are distributed in the cosmic web in different environments. The luminosity of the gal…
Non-relativistic effective theories for fields with general potentials and their implications for cosmology
H. S. Modirzadeh, R. Moti, M. H. Namjoo
Non-relativistic effective field theories (NREFTs) play a crucial role in various areas of physics, from cold atom experiments to cosmology. In this paper, we present a systematic…
Addressing the too-big-to-fail problem and the void phenomenon through a modified initial power spectrum
Hamed Kameli, Shant Baghram
We investigate the impact of early-time initial conditions on nonlinear structure formation and evolution within the framework of the semi-analytical Excursion Set Theory (EST). Ou…
One-point Statistics in various cosmic environments in the presence of massive neutrinos
Mohadese Khoshtinat, Hossein Hatamnia, Shant Baghram
Studying the structures (halos and galaxies) within the cosmic environments (void, sheet, filament, and node) where they reside is an ongoing attempt in cosmological studies. The l…
Clustering of dark matter in the cosmic web as a probe of massive neutrinos
Mohadese Khoshtinat, Mohammad Ansarifard, Farbod Hassani +1
The large-scale structure of the Universe is distributed in a cosmic web. Studying the distribution and clustering of dark matter particles and halos may open up a new horizon for…
Nearest neighbour analysis as a new probe for fuzzy dark matter
Hamed Manouchehri Kousha, Mohammad Ansarifard, Aliakbar Abolhasani
Fuzzy dark matter (FDM) is a promising candidate for dark matter, characterized by its ultra-light mass, which gives rise to wave effects at astrophysical scales. These effects off…
Clusternets: A deep learning approach to probe clustering dark energy
Amirmohammad Chegeni, Farbod Hassani, Alireza Vafaei Sadr +2
Machine Learning (ML) algorithms are becoming popular in cosmology for extracting valuable information from cosmological data. In this paper, we evaluate the performance of a Convo…
The Effective Field Theory of Large Scale Structures of a Fuzzy Dark Matter Universe
Hamed Manouchehri Kousha, Sina Hooshangi, Aliakbar Abolhasani
Ultra-light scalar fields and their non-interacting class, the so-called fuzzy dark matter (FDM), are candidates for dark matter, introduced to solve the small-scale problems of th…
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…
Voids and Halos in Voids statistics as a probe of the Expansion History of the Universe
Laya Parkavousi, Hamed Kameli, Shant Baghram
Structures in the Universe are arranged into the cosmic web. Distributions, statistics, and evolutions of the structures can be used as probes for cosmological models. We investiga…
Cosmic velocity, density and halo mass function: Insights from deep learning
Saba Etezad-Razavi, Erfan Abbasgholinejad, Mohammad-Hadi Sotoudeh +3
We discuss an implementation of a deep learning framework to gain insight into dark matter (DM) structure formation. We investigate the contribution of velocity and density field i…
Spin Alignment of Dark Matter Halos: Mad Halos
E. Ebrahimian, A. A. Abolhasani
We investigate the spin alignment of the dark matter halos by considering a mechanism somewhat similar to tidal locking. We dubbed it Tidal Locking Theory (TLT). While Tidal Torque…
MOG cosmology without dark matter and the cosmological constant
Zahra Davari, Sohrab Rahvar
In this work, we investigate the MOdified Gravity (MOG) theory for dynamics of the universe and compare the results with the CDM cosmology. We study the background cosmological…
Structure of cosmic web in non-linear regime: the nearest neighbour and spherical contact distributions
Mohammad Ansari Fard, Zahra Baghkhani, Laya Ghodsi +3
In non-linear scales, the matter density distribution is not Gaussian. Consequently, the widely used two-point correlation function is not adequate anymore to capture the matter de…
Imprints of Gravitational Millilensing on the Light Curve of GRBs
Zeinab Kalantari, Alaa Ibrahim, Mohammad Reza Rahimi Tabar +1
In this work, we search for signatures of gravitational millilensing in Gamma-ray bursts (GRB) in which the source-lens-observer geometry produces two images that manifest in the G…
Primordial Black Holes in the Excursion Set Theory
Encieh Erfani, Hamed Kameli, Shant Baghram
We study primordial black holes (PBHs) formation in the excursion set theory (EST) in a vast range of PBHs masses with and without confirmed constraints on their abundance. In this…
CMB lensing in a modified CDM model in light of the tension
Hossein Moshafi, Shant Baghram, Nima Khosravi
The observed discrepancy of the Hubble parameter measurements in the local universe with the cosmic microwave background (CMB) data may indicate a new physics. It is vital to test…
Mass assembly history of dark matter halos in the light of tension
Hamed Kameli, Shant Baghram
The Hubble tension may introduce a new course of action to revise the standard CDM model to unravel dark energy and dark matter physics. The Hubble parameter can be reconstructe…
Dynamical Tidal Locking Theory: A new source of the Spin of Dark Matter Halos
E. Ebrahimian, A. A. Abolhasani
We revisit the question of what mechanism is responsible for the spins of halos of dark matter. The answer to this question is of high importance for modeling galaxy intrinsic alig…
Modified initial power spectrum and too big to fail problem
Hamed Kameli, Shant Baghram
The galactic scale challenges of dark matter such as "missing satellite" problem and "too big to fail" problem are the main caveats of standard model of cosmology. These challenges…
Investigation of two colliding solitonic cores in Fuzzy Dark Matter models
Alireza Maleki, Shant Baghram, Sohrab Rahvar
One of the challenging questions in cosmology is the nature of dark matter particles. Fuzzy Dark Matter (FDM) is one of the candidates which is made of very light ($m_{FDM}\simeq 1…
Cherenkov in the Sky: Measuring the Sound Speed of Primordial Scalar Fluctuations
Ali Akbar Abolhasani, Sadra Jazayeri
We consider production of additional relativistic particles coupled to the inflaton. We show that the imprints of these particles on the spectrum of primordial perturbations can be…
Resonant Reconciliation of Convex Models and the Planck
Ali Akbar Abolhasani, M. M. Sheikh-Jabbari
We consider single field chaotic inflationary models plus a cosine modulation term, as in axion monodromy models, and augment it by a light scalar field with similar cosine couplin…