59 citations · 557 across the 31 of their papers we have counts for
31 papers
A semi-model-independent approach to describe a cosmological database
Ahmad Mehrabi
A model-independent or non-parametric approach for modeling a database has been widely used in cosmology. In these scenarios, the data has been used directly to reconstruct an unde…
Model-independent estimation of the cosmography parameters using cosmic chronometers
Faeze Jalilvand, Ahmad Mehrabi
Measurement of the universe expansion rate through the cosmic chronometers proves to be a novel approach to understanding cosmic history. Although it provides a direct determinatio…
Gaussian discriminators between CDM and wCDM cosmologies using expansion data
Ahmad Mehrabi, Jackson Levi Said
The Gaussian linear model provides a unique way to obtain the posterior probability distribution as well as the Bayesian evidence analytically. Considering the expansion rate data,…
Reconstruction of dark energy density by non-parametric approaches
Ahmad Mehrabi, Maryam Vazirnia
The evolution of dark energy density is a crucial quantity in understanding the nature of dark energy. Often, the quantity is described by the so-called equation of state, that is…
Cosmographic parameters in model-independent approaches
Ahmad Mehrabi, Mehdi Rezaei
Cosmographic approach, a Taylor expansion of the Hubble function, has been used as a model-independent method to investigate the evolution of the universe in the presence of cosmol…
Non-parametric modeling of the cosmological data, base on the distribution
Maryam Vazirnia, Ahmad Mehrabi
In the CDM model, cosmological observations from the late and recent universe reveal a puzzling tension in the current rate of universe expansion. In addition to the…
Using newest VLT-KMOS HII Galaxies and other cosmic tracers to test the CDM tension
Ahmad Mehrabi, Spyros Basilakos, Pavlina Tsiapi +8
We place novel constraints on the cosmokinetic parameters by using a joint analysis of the newest VLT-KMOS HII galaxies (HIIG) with the Supernovae Type Ia (SNIa) Pantheon sample. W…
Flare Activity and Magnetic Feature Analysis of the Flare Stars II: Sub-Giant Branch
Hadis Goodarzi, Ahmad Mehrabi, Habib G. Khosroshahi +1
We present an investigation of the magnetic activity and flare characteristics of the sub-giant stars mostly from F and G spectral types and compare the results with the main-seque…
A Bayesian comparison between CDM and phenomenologically emergent dark energy models
M. Rezaei, T. Naderi, M. Malekjani +1
In this work we examine the recently proposed phenomenological emergent dark energy (PEDE) model by \cite{Li:2019yem}, using the latest observational data in both expansion and per…
Does CDM really be in tension with the Hubble diagram data?
Ahmad Mehrabi, Spyros Basilakos
In this article, we elaborate further on the CDM "tension", suggested recently by the authors \cite{Lusso:2019akb,Risaliti:2018reu}. We combine Supernovae type Ia (SNIa) with qu…
The growth of DM and DE perturbations in DBI non-canonical scalar field scenario
K. Rezazadeh, S. Asadzadeh, K. Fahimi +2
We study the effect of varying sound speed on clustering dark energy in the Dirac-Born-Infeld (DBI) scenario. The DBI action is included in the class of -essence models, and it…
Flare Activity and Magnetic Feature Analysis of the Flare Stars
Hadis Goodarzi, Ahmad Mehrabi, Habib khosroshahi +1
We analyze the light curve of 1740 flare stars to study the relationship between the magnetic feature characteristics and the identified flare activity. Coverage and stability of m…
Information gains from Monte Carlo Markov Chains
Ahmad Mehrabi, A. Ahmadi
In this paper, we present a novel method for computing the relative entropy as well as the expected relative entropy using an MCMC chain. The relative entropy from information theo…
Growth of perturbations in dark energy parametrization scenarios
A. Mehrabi
In this paper, we study the evolution of dark matter perturbations in the linear regime by considering the possibility of dark energy perturbations. To do this, two popular paramet…
Dark energy reconstruction based on the PADE approximation; an expansion around the CDM
A. Mehrabi, S. Basilakos
We study the dynamical properties of dark energy based on a large family of PADE parameterizations for which the dark energy density evolves as a ratio between two polynomials in t…
Primordial black hole detection through diffractive microlensing
T. Naderi, A. Mehrabi, S. Rahvar
Recent observations of gravitational waves motivate investigations for the existence of Primordial Black Holes (PBHs). We propose the observation of gravitational microlensing of d…
Constraints to dark energy using PADE parameterisations
Mehdi Rezaei, Mohammad Malekjani, Spyros Basilakos +2
We put constraints on dark energy properties using the PADE parameterisation, and compare it to the same constraints using Chevalier-Polarski-Linder (CPL) and CDM, at both the b…
Measuring the effects of Loop Quantum Cosmology in the CMB data
Spyros Basilakos, Vahid Kamali, Ahmad Mehrabi
In this Essay we investigate the observational signatures of Loop Quantum Cosmology (LQC) in the CMB data. First, we concentrate on the dynamics of LQC and we provide the basic cos…
Activity Analyses for Solar-type Stars Observed with Kepler. II. Magnetic Feature Versus Flare Activity
Han He, Huaning Wang, Mei Zhang +3
The light curves of solar-type stars present both periodic fluctuation and flare spikes. The gradual periodic fluctuation is interpreted as the rotational modulation of magnetic fe…
Tachyon warm inflation with the effects of Loop Quantum Cosmology in the light of Planck 2015
Vahid Kamali, Spyros Basilakos, Ahmad Mehrabi +2
We investigate the observational signatures of quantum cosmology in the Cosmic Microwave Background data provided by Planck collaboration. We apply the warm inflationary paradigm w…
Magnetic activity analysis for a sample of G-type main sequence \emph{Kepler} targets
A. Mehrabi, H. He, H. Khosroshahi
The variation of a stellar light curve owing to the rotational modulation by the magnetic features (starspots and faculae) on the star's surface can be used to investigate the magn…
Consistency of nonlinear interacting ghost dark energy with recent observations
E. Ebrahimi, H. Golchin, A. Mehrabi +1
In this paper we investigate ghost dark energy model in the presence of non-linear interaction between dark energy and dark matter. We also extend the analysis to the so called gen…
Agegraphic dark energy: growth index and cosmological implications
M. Malekjani, S. Basilakos, A. Mehrabi +2
We study the main cosmological properties of the agegraphic dark energy model at the expansion and perturbation levels. Initially, using the latest cosmological data we implement a…
Constraints on shear and rotation with massive galaxy clusters
Ahmad Mehrabi, Francesco Pace, Mohammad Malekjani +1
A precise determination of the mass function is an important tool to verify cosmological predictions of the CDM model and to infer more precisely the better model describing the…