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Observational Constraints on Yukawa f(R) Gravity in Palatine Formalism

Abbar, Sajad | 2009

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 39584 (04)
  4. University: Sharif University of Technology
  5. Department: Physics
  6. Advisor(s): Rahvar, Sohrab
  7. Abstract:
  8. The increasing acceleration of the universe is one of the most challenging problems that cosmology has ever faced. Several models are presented to explain this increasing acceleration and one of the most famous models is “Dark Energy”. According to this model, all of the universe is filled by a fluid with a negative pressure and the equation of state of . Despite all of the achievements in explaining the observations, this model has very important problems in its basis. As a result, recently some other models have been considered to explain this increasing acceleration, including f(R) generalized gravity. In this final thesis, f(R) generalized gravity within Palatini formalism by a Yukawa potential has been explored and the free parameters of the model has been confined by means of observations. To confine the parameters, we used the data of supernova Ia, CMB shift parameter, baryonic acoustic oscillations, growth index parameter and Hubble parameter. After determining the best confidence contours, we reached some interesting results. First of all, at the best confidence contour, our model transforms to “R inverse” model that was the first considered model. Also we found that at the best confidence contours, the Union sample of 307 SNe Ia is more consistent with other data than SNIa Gold sample. Finally, we showed the recent Hubble parameter data are consistent with other observational constraints.

  9. Keywords:
  10. Cosmology ; Dark Energy ; Generalized Gravity ; Increasing Acceleration of the Universe

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