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The Effect of Radiation Pressure on Dust and Gas Dynamics in Accretion Disks

Mohammadi, Amir Hossein | 2022

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 55688 (04)
  4. University: Sharif University of Technology
  5. Department: Physics
  6. Advisor(s): Rahvar, Sohrab
  7. Abstract:
  8. The purpose of this study is to investigate the effect of radiation pressure on accretion disks. The radiation density causes the separation of electrons from ions which leads to the creation of an internal electric dipole. In this study Radiation density is calculated using the Eddington limit. Afterwards radiation pressure is calculated with the use of collisions between photons and electrons in the plasma. Collisions are assumed to happen only between photons and electrons, due to the larger cross section of electrons compared to protons. The mentioned assumption causes the creation of an electric dipole and with it an internal electric field. The separation of the charges is assumed to happen in separate plates as in plate capacitors. In order to calculate the electric field pressure in the steady state, we have made use of an RC circuit model. In this model it is assumed that an electric generator and voltage is present; due to photon-electron collision, and that plasma causes the resistance. The aforementioned steady state is a state which occurs when radiation pressure and electric field pressure are equal. The separation length and surface charge density were then calculated in the steady state. Due to the fluctuation of radiation, it is possible that the capacitor plates collide, which in theory would lead to a discharge and therefore the releasing of their internal energy. This energy release can be considered as the cause of the astrophysical radio bursts.

  9. Keywords:
  10. Fluid Mechanics ; Magnetohydrodynamic ; Gravitation ; Radiation Pressure ; Accretion Disks

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