Violation of the Equivalence Principle in Modified Theories of Gravity

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dc.creatorOlmo, Gonzalo J.
dc.date2006-11-30
dc.date2007-01-09
dc.date.accessioned2026-07-07T11:21:34Z
dc.date.available2026-07-07T11:21:34Z
dc.descriptionWe study modified theories of gravity of the f(R) type in Palatini formalism. For a generic f(R) lagrangian, we show that the metric can be solved as the product of a scalar function times a rank-two tensor (or auxiliary metric). The scalar function is sensitive to the local energy-momentum density. The auxiliary metric satisfies a set of equations very similar to Einstein's equations and, for weak sources, it can be approximated by the Minkowski metric. According to this, the metric coupled to the matter strongly departs from the Minkowskian one in the neighbourhood of any microscopic physical system. As a consequence, new gravitationally-induced interactions arise and lead to observable effects at microscopic and macroscopic scales. In particular, test body trajectories experience self-accelerations which depend on the internal structure and composition of the body. These facts make very unlikely the viability of Palatini f(R) models designed to change the late-time cosmic evolution.
dc.description4 pages, references and small comments added, to appear in Phys.Rev.Lett
dc.identifierhttps://arxiv.org/abs/gr-qc/0612002
dc.identifierhttp://arxiv.org/abs/gr-qc/0612002
dc.identifierPhys.Rev.Lett.98:061101,2007
dc.identifierdoi:10.1103/PhysRevLett.98.061101
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/194298
dc.subjectGeneral Relativity and Quantum Cosmology
dc.subjectAstrophysics
dc.subjectHigh Energy Physics - Theory
dc.titleViolation of the Equivalence Principle in Modified Theories of Gravity
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