16 citations · 113 across the 30 of their papers we have counts for
30 papers
Polarization of the CMB in the Standard Model Extension
Iman Motie, Jafar Khodagholizadeh, S. Mahmoudi +2
In standard cosmology, Cosmic Microwave Background photons near the last scattering surface exhibit only linear polarization due to Compton scattering, leading to the assumption th…
Testing loop quantum gravity by quasi-periodic oscillations: rotating blackholes
Jafar Khodagholizadeh, Ghadir Jafari, Alireza Allahyari +1
We investigate a compelling model of a rotating black hole that is deformed by the effects of loop quantum gravity (LQG). We present a simplified metric and explore two distinct ge…
Probing the warped vacuum geometry around a Kerr black hole by quasi-periodic oscillations
M. Hossein Hesamolhokama, Alireza Allahyari, Jafar Khodagholizadeh +1
We investigate quasi-periodic oscillations (QPOs) in the context of a new rotating black hole solution that incorporates a cosmological constant. Recent work by the authors in \cit…
Generation of the CMB cosmic Birefringence through Axion-like particles, Sterile and Active neutrinos
Somayyeh Mahmoudi, Mahdi Sadegh, Jafar Khodagholizadeh +3
The cosmic birefringence (CB) angle refers to the rotation of the linear polarization plane of Cosmic Microwave Background (CMB) radiations when parity-violating theories are consi…
Muon anomalous magnetic moment and Right handed sterile neutrino
Iman Motie, S. Mahmoudi, Mahdi Sadegh +3
The muon's magnetic moment is a fundamental quantity in particle physics and the deviation of its value from quantum electrodynamics (QED), motivates research beyond the standard m…
Constraints on Dark Energy from the Gravitational Wave Background
Jafar Khodagholizadeh
Current observational data indicate that dark energy (DE) is a cosmological constant without considering its conclusiveness evidence. Considering the dynamic nature of individu…
Cosmic Birefringence as a probe of dark matter nature: Sterile neutrino and dipolar dark matter
Jafar Khodagholizadeh, S. Mahmoudi, R. Mohammadi +1
Recently, non-zero rotation angle [Phys. Rev. Lett. \textbf{128}, no.9, 091302 (2022)] has been reported for linear polarization of…
CMB Polarization by the Asymmetric Template of Scalar Perturbations
Jafar Khodagholizadeh, Rohoollah Mohammadi, S. M. S. Movahed
Inspired by a dipole asymmetric template for the CMB temperature map in the primordial scalar fluctuations observed by Planck at a large scale, we examine the contribution of a sim…
Gravitational Waves with Dark Energy
J. Khodagholizadeh
In this article, we study the tensor mode equation of perturbation in the presence of nonzero-Lambda as dark energy, the dynamic nature of which depends on the Hubble parameter H a…
Cross-correlation Power Spectra and Cosmic Birefringence of the CMB via Photon-neutrino Interaction
Roohollah Mohammadi, Jafar Khodagholizadeh, Mahdi Sadegh +2
In the context of the standard model of particles, the weak interaction of cosmic microwave background (CMB) and cosmic neutrino background (CB), can generate non-vanishing TB a…
Neutrinos as a probe of curvature
Jafar Khodagholizadeh
Neutrinos, as the anisotropic stress tensor, have a damping effect on the tensor mode perturbation from inflation to the dominated era. First, we study the squared amplitude r…
A new experiment for the gravitational waves detection
Basem Ghayour, Jafar Khodagholizadeh, Christian Corda +2
A new experiment for the gravitational waves (GWs) detection is proposed. It is indeed shown that the effect of GWs on sound waves (SWs) in a fluid is that GWs vary the pressure of…
Gravitational Waves in a Closed Spacetime via Deviation Equation
Jafar Khodagholizadeh, Amir H. Abbassi, Ali Vahedi +1
Within the closed universe, we obtain the amplitude and frequency of gravitational waves in the terms of discrete wave numbers, wave propagation time, and cosmological constant usi…
Aschenbach effect for spinning particles in Kerr-(A)dS spacetime
Ali Vahedi, Jafar Khodagholizadeh, Arman Tursunov
A non-monotonic behavior of the velocity gradient of a test particle revolving around a rapidly rotating black hole in the locally non-rotating frame of reference is known as the A…
Are latest detected events of gravitational waves in favor of some models of inflation based on string theory?
Basem Ghayour, Jafar Khodagholizadeh, M. Afkani +2
The general potential of power-law inflation is as with scalar field . The behavior of inflation is often known as power-law expansion like $S(η)\propto η^…
Aschenbach effect for spinning particles in Kerr spacetime
Jafar Khodagholizadeh, Volker Perlick, Ali Vahedi
The orbital velocity profile of circular timelike geodesics in the equatorial plane of a Kerr black hole has a non-monotonic radial behavior, provided that the spin parameter o…
Curvature and topology dependency of the cosmological spectra
Ali A. Asgari, Amir H. Abbassi, Jafar Khodagholizadeh
In this article we investigate dependency of the adiabatic and entropy spectral indices of the cosmological perturbations on the geometry and topology of the background universe. O…
Detection relic gravitational waves in thermal case by using Adv.LIGO data of GW150914
Basem Ghayour, Jafar Khodagholizadeh
The thermal spectrum of relic gravitational waves causes the new amplitude that called `modified amplitude'. Our analysis shows that, there exist some chances for detection of the…
Tensor Modes Damping in Matter and Vacuum Dominated Era
Jafar Khodagholizadeh, Amir H. Abbassi, Ali A. Asgari
The present paper has developed an integro-differential equation to propagate cosmological gravitation waves in matter-dominated era in accounting for the presence of free streamin…
The B-mode polarization of CMB and Cosmic Neutrino Background
Rohoollah Mohammadi, Jafar Khodagholizadeh, Mahdi Sadegh +1
It is known that in contrast with the E-mode polarization, the B-mode polarization of the Cosmic Microwave Background cannot be generated by the Compton scattering in the case of s…
Supernova Neutrino Background Bound on the SFR History
Jafar Khodagholizadeh, Sepehr Arbabi Bidgoli, Zamri Zainal Abidin
The purpose of the present study is to compare the predictions of different models of star formation rate (SFR) history in the universe with the upper limit of Super Kamiokande for…
Relativistic generalization of the Born rule
Mohammad Javad Kazemi, Mohammad Hosein Barati, Yahya Rokni +1
We have shown that the Born rule is inconsistent with Lorentz symmetry of the Salpeter equation (square root Klein-Gordon equation). So we find relativistic modificat…
Lorentz violation and red shift of gravitational waves in brane-worlds
Fatemeh Ahmadi, Jafar Khodagholizadeh, H. R. Sepangi
In this paper we study the speed of gravitational waves in a brane world scenario and show that if the extra dimension is space-like, the speed of the propagation of such waves is…
Effect of GUP on the Kepler problem and a variable minimal length
Fatemeh Ahmadi, Jafar Khodagholizadeh
Various approaches to quantum gravity, such as string theory, predict a minimal measurable length and a modification of the Heisenberg Uncertainty Principle near the Plank scale, k…