Permanent URL to this publication: http://dx.doi.org/10.5167/uzh-59979
Lubini, M; Tortora, C; Näf, J; Jetzer, P; Capozziello, S (2011). Probing the dark matter issue in f(R)-gravity via gravitational lensing. European Physical Journal C - Particles and Fields, 71(12):1834.
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For a general class of analytic f(R)-gravity theories, we discuss the weak field limit in view of gravitational lensing. Though an additional Yukawa term in the gravitational potential modifies dynamics with respect to the standard Newtonian limit of General Relativity, the motion of massless particles results unaffected thanks to suitable cancellations in the post-Newtonian limit. Thus, all the lensing observables are equal to the ones known from General Relativity. Since f(R)-gravity is claimed, among other things, to be a possible solution to overcome for the need of dark matter in virialized systems, we discuss the impact of our results on the dynamical and gravitational lensing analyses. In this framework, dynamics could, in principle, be able to reproduce the astrophysical observations without recurring to dark matter, but in the case of gravitational lensing we find that dark matter is an unavoidable ingredient. Another important implication is that gravitational lensing, in the post-Newtonian limit, is not able to constrain these extended theories, since their predictions do not differ from General Relativity.
|Item Type:||Journal Article, refereed, original work|
|Communities & Collections:||07 Faculty of Science > Institute of Theoretical Physics|
|Deposited On:||23 Feb 2012 22:45|
|Last Modified:||23 Feb 2014 11:54|
|Additional Information:||The original publication is available at www.springerlink.com|
|Citations:||Web of Science®. Times Cited: 5|
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