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F(R) gravity: From the Pioneer anomaly to cosmic acceleration

Saffari, R ; Sharif University of Technology | 2008

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  1. Type of Document: Article
  2. DOI: 10.1103/PhysRevD.77.104028
  3. Publisher: 2008
  4. Abstract:
  5. We use metric formalism in f(R) modified gravity to study the dynamics of various systems from the solar system to the cosmological scale. We assume an ansatz for the derivative of action as a function of distance and describe the Pioneer anomaly and the flat rotation curve of the spiral galaxies. Having the asymptotic behavior of action, we propose the action of f(R)=(R+Λ)(1+ln (R/Rc)/(R/R0+2/α)) where in galactic and solar system scales it can recover our desired form. The vacuum solution of this action also results in a positive late time acceleration for the Universe. We fix the parameters of this model, comparing with the Pioneer anomaly, rotation curve of spiral galaxies, and supernova type Ia gold sample data. © 2008 The American Physical Society
  6. Keywords:
  7. Modified Gravity ; Cosmology ; Noether
  8. Source: Physical Review D - Particles, Fields, Gravitation and Cosmology ; Volume 77, Issue 10 , 2008 ; 15507998 (ISSN)
  9. URL: https://journals.aps.org/prd/abstract/10.1103/PhysRevD.77.104028