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Numerical Hydrodynamics for Compact Stars

Feghhi, Touhid | 2015

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 47492 (04)
  4. University: Sharif University of Technology
  5. Department: Physics
  6. Advisor(s): Mansouri, Reza; Taghizadeh Firouzjaee, Javad
  7. Abstract:
  8. Compact Objects involve White Dwarfs,Neutron Stars and Black Holes which are formed from the gravitational collapse of main sequence stars after their nuclear fuel is finished.The special characteristic of all Compact Objects is that they are high density which requires a vast knowledge of nuclear physics with strong and weak interactions ,electromagnetic and numerical methods.we need general relativistic simulation of stars because the theories are simple and some are not in agreement with observations. studying of astro physical constraints on equation of state ,stability and cooling of Neutron Stars and pulsation of gravitational waves is needed nowadays. in first part of this thesis,we will review the physical Characteristics of these stars. finally we will simulate general relativistic collapse of a star with hybrid equation of state. in hybrid equation of state, pressure is equivalent to sum of polytropic EOS and thermal pressure. to model the nuclear repulsive force we put r= 2٫5. we use a semi discrete approach, means discretizing Hydrodynamic equations with Method of Lines and integrating with 2nd order Runge-Kutta method. results of simulation showed that the as the star is collapsing to near nuclear density, nuclear repulsive force halts back collapse and the core bounces and finally we have a stable neutron star
  9. Keywords:
  10. Compact Stars ; Numerical Relativity ; Relativistic Structures

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