Power-laws f(R) theories are cosmologically unacceptable

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dc.creatorAmendola, Luca
dc.creatorPolarski, David
dc.creatorTsujikawa, Shinji
dc.date2006-05-16
dc.date2007-12-26
dc.date.accessioned2026-07-07T11:57:23Z
dc.date.available2026-07-07T11:57:23Z
dc.descriptionIn a recent paper [1] (PRL 98,131302,2007) we have shown that f(R)=R + mu R^{n} modified gravity dark energy models are not cosmologically viable because during the matter era that precedes the accelerated stage the cosmic expansion is given by a sim t^{1/2} rather than a sim t^{2/3}, where a is a scale factor and t is the cosmic time. A recent work [2] (PLB 639,135-143,2006) by Capozziello et al. criticised our results presenting some apparent counter-examples to our claim in f(R)= mu R^{n} models. We show here that those particular R^{n} models can produce an expansion as a sim t^{2/3} but this does not connect to a late-time acceleration. Hence, though acceptable f(R) dark energy models may exist, the R^{n} models presented in Capozziello et al. are not cosmologically viable, confirming our previous results in Ref. [1].
dc.description4 pages, 1 figure, title changed
dc.identifierhttps://arxiv.org/abs/astro-ph/0605384
dc.identifierhttp://arxiv.org/abs/astro-ph/0605384
dc.identifierInt.J.Mod.Phys.D16:1555-1561,2007
dc.identifierdoi:10.1142/S0218271807010936
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/205864
dc.subjectAstrophysics
dc.subjectGeneral Relativity and Quantum Cosmology
dc.subjectHigh Energy Physics - Phenomenology
dc.subjectHigh Energy Physics - Theory
dc.titlePower-laws f(R) theories are cosmologically unacceptable
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