Publication:

In this page you can find my publications journal references.                                                                                                                                                      Also the title and  the abstract of the latest paper is here. The articles are  available at  arXiv page:

1) Shant Baghram and Sohrab Rahvar, Phys. Rev. D. 80, 124049 (2009).

Title:Inverse problem: Reconstruction of the modified gravity action in the Palatini formalism
by supernova type Ia data

Abstract: We introduce in f(R) gravity-Palatini formalism the method of the inverse problem to extract the action
from the expansion history of the Universe. First, we use an ansatz for the scale factor and apply the
inverse method to derive an appropriate action for the gravity. In the second step we use the supernova
type Ia data set from the Union sample and obtain a smoothed function for the Hubble parameter up to the
redshift 1.7. We apply the smoothed Hubble parameter in the inverse approach and reconstruct the
corresponding action in f(R) gravity. In the next step we investigate the viability of reconstruction
method, doing a Monte Carlo simulation we generate synthetic SNIa data with the quality of the Union
sample and show that roughly more than 1500 SNIa data is essential to reconstruct correct action. Finally,
with enough SNIa data, we propose two diagnosis in order to distinguish between the CDM model and
an alternative theory for the acceleration of the Universe.

2) Shant Baghram, M. Sadegh Movahed, and Sohrab Rahvar, Phys. Rev. D. 80, 064003 (2009)

3) M. Sadegh Movahed, Shant Baghram and Sohrab Rahvar, Phys. Rev. D. 76, 044008 (2007)

4) Shant Baghram, Marzieh Farhang, and Sohrab Rahvar,  Phys. Rev. D. 75, 044024 (2007)

*******************************************************************