Microscopic and Macroscopic Behaviors of Palatini Modified Gravity Theories

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dc.creatorLi, Baojiu
dc.creatorMota, David F.
dc.creatorShaw, Douglas J.
dc.date2008-05-22
dc.date2008-05-30
dc.date.accessioned2026-07-07T11:51:01Z
dc.date.available2026-07-07T11:51:01Z
dc.descriptionWe show that, within modified gravity, the non-linear nature of the field equations implies that the usual naive averaging procedure (replacing the microscopic energy-momentum by its cosmological average) is invalid. We discuss then how the averaging should be performed correctly and show that, as a consequence, at classical level the physical masses and geodesics of particles, cosmology and astrophysics in Palatini modified gravity theories are all indistinguishable from the results of general relativity plus a cosmological constant. Palatini gravity is however a different theory from general relativity and predicts different internal structures of particles from the latter. On the other hand, and in contrast to classical particles, the electromagnetic field permeates in the space, hence a different averaging procedure should be applied here. We show that in general Palatini gravity theories would then affect the propagation of photons, thus changing the behaviour of a Universe dominated by radiation. Finally, Palatini theories also predict alterations to particle physics laws. For example, it can lead to sensitive corrections to the hydrogen energy levels, the measurements of which could be used to place very strong constraints on the properties of viable Palatini gravity theories
dc.description21 pages
dc.identifierhttps://arxiv.org/abs/0805.3428
dc.identifierhttp://arxiv.org/abs/0805.3428
dc.identifierPhys.Rev.D78:064018,2008
dc.identifierdoi:10.1103/PhysRevD.78.064018
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/203758
dc.subjectGeneral Relativity and Quantum Cosmology
dc.subjectAstrophysics
dc.subjectHigh Energy Physics - Phenomenology
dc.subjectHigh Energy Physics - Theory
dc.titleMicroscopic and Macroscopic Behaviors of Palatini Modified Gravity Theories
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