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37 papers · 1 filter
Spherical Collapse in Modified Newtonian Dynamics (MOND)
M. Malekjani, S. Rahvar, H. Haghi
Modeling the structure formation in the universe, we extend the spherical collapse model in the context of MOND starting with the linear Newtonian structure formation followed by t…
Third Order Effect of Rotation on Stellar Oscillations of a -Cephei Star
K. Karami
Here the effect of rotation up to third order in the angular velocity of a star on the p, f and g modes is investigated. To do this, the third-order perturbation formalism presente…
Application of a New Non-Linear Least Squares Velocity Curve Analysis Technique for Spectroscopic Binary Stars
K. Karami, R. Mohebi, M. M. Soltanzadeh
Using measured radial velocity data of nine double lined spectroscopic binary systems NSV 223, AB And, V2082 Cyg, HS Her, V918 Her, BV Dra, BW Dra, V2357 Oph, and YZ Cas, we find c…
A nanoflare model for active region radiance: application of artificial neural networks
M. Bazarghan, H. Safari, D. E. Innes +2
Context. Nanoflares are small impulsive bursts of energy that blend with and possibly make up much of the solar background emission. Determining their frequency and energy input is…
Consistency Condition of Spherically Symmetric Solutions in Gravity
Reza Saffari, Sohrab Rahvar
In this work we study the spherical symmetric solutions of gravity in the metric formalism. We show that for a generic gravity, the spherical symmetric solution is co…
f(R) Gravity: From the Pioneer Anomaly to the Cosmic Acceleration
Reza Saffari, Sohrab Rahvar
We use metric formalism in modified gravity to study the dynamics of various systems from the solar system to the cosmological scale. we assume an ansatz for the derivative…