1. Constraining f(R) theories with cosmography
- Author
-
Florencia Anabella Teppa Pannia and Santiago Esteban Perez Bergliaffa
- Subjects
Physics ,Ciencias Astronómicas ,Cosmology and Nongalactic Astrophysics (astro-ph.CO) ,Ciencias Físicas ,FOS: Physical sciences ,Astronomy and Astrophysics ,Observable ,purl.org/becyt/ford/1.3 [https] ,General Relativity and Quantum Cosmology (gr-qc) ,Type (model theory) ,Otras Ciencias Físicas ,General Relativity and Quantum Cosmology ,Cosmology ,Redshift ,Exponential function ,gravity ,purl.org/becyt/ford/1 [https] ,Gravitation ,Limit (mathematics) ,Series expansion ,modified gravity ,cosmology of theories beyond the SM ,CIENCIAS NATURALES Y EXACTAS ,Astrophysics - Cosmology and Nongalactic Astrophysics ,Mathematical physics - Abstract
A method to set constraints on the parameters of extended theories of gravitation is presented. It is based on the comparison of two series expansions of any observable that depends on H(z). The first expansion is of the cosmographical type, while the second uses the dependence of H with z furnished by a given type of extended theory. When applied to f(R) theories together with the redshift drift, the method yields limits on the parameters of two examples (the theory of Hu and Sawicki (2007), and the exponential gravity introduced by Linder (2009)) that are compatible with or more stringent than the existing ones, as well as a limit for a previously unconstrained parameter., Comment: 9 pages, 2 figures; v2: modifications in title and presentation, results unchanged
- Published
- 2013