Calculating the Scattering Cross Section of the Photons Scattered from Particles Associated with the Fifth Force Field in MOG Theory

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Mirzavand, Mahdi | 2020

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 53517 (04)
University: Sharif University of Technology
Department: Physics Science
Advisor(s): Rahvar, Sohrab
Abstract:
In this thesis, we first review MOdified Gravity (MOG) theory as an alternative to dark matter models and then investigate some of the phenomena related to galaxy dynamics and gravitational lensing within the framework of this theory. In the last step, we present a model for the interaction of the fifth force field and the electromagnetic field. This model is based on the definition of a current density of matter using the energy momentum tensor in which the Lorentz symmetry is broken. This is due to the existence of a constant coefficient in the interaction, which can be considered as a fixed background field or observer 4-velocity that couples to energy momentum tensor. After introducing this interaction, we calculate the cross-sectional area of the photon and the particles of the fifth force field in the theory. We perform this calculation by selecting the value of the constant coefficient in two cases, in one of which it is not possible to calculate the total cross-sectional area due to the singularity in the scattering matrix. Finally, we examine the validity of this interaction and list the uses of this scattering cross section in cosmology
Keywords:
Scattering Cross Section ; Gravitational Lensing ; Modified Gravity ; Energy Momentum Tensor