2014
DOI: 10.1007/s10714-014-1699-x
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Particle creation in a $$f(R)$$ f ( R ) theory with cosmological constraints

Abstract: In this paper we study the creation of super-massive real scalar particles in the framework of a f (R) = R − β/R n modified gravity theory, with parameters constrained by observational data.The analysis is restrict to a homogeneous and isotropic flat and radiation dominated universe. We compare the results to the standard Einstein gravity with cosmological constant (ΛCDM model), and we show that the total number density of created particles in the f (R) model is very close to the standard case. Another interes… Show more

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Cited by 8 publications
(5 citation statements)
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“…If one considers GR, then there is no creation of massless particles (no photon, graviton or any other kind of massless particles) in a radiation dominated universe due to conformal invariance of the metric. However, recently in case of modified theories of gravity, in particular, in case of f (R) theory of gravity massless particle creation has been reported [80][81][82]. The study of particle creation problem is complicated, since exists the problem of the definition of the particles and the vacuum states.…”
Section: Varying Ghost Sark Energy Modelsmentioning
confidence: 99%
“…If one considers GR, then there is no creation of massless particles (no photon, graviton or any other kind of massless particles) in a radiation dominated universe due to conformal invariance of the metric. However, recently in case of modified theories of gravity, in particular, in case of f (R) theory of gravity massless particle creation has been reported [80][81][82]. The study of particle creation problem is complicated, since exists the problem of the definition of the particles and the vacuum states.…”
Section: Varying Ghost Sark Energy Modelsmentioning
confidence: 99%
“…Não à toa, conforme Pereira (2020) À vista disso, uma ênfase recai sobre o nacionalismo ou apelos indentitários de grupos específicos já que ações podem ser fomentadas mais por preocupações com o bem-estar daqueles com quem compartilham uma identidade comum, sendo distinto daquele deduzido da agregação de interesses individuais pautadas em capacidade e retorno destas colaborações (Hafner-Burton et al, 2017).…”
Section: Aplicando O Estudo Deunclassified
“…A integração deste aspecto em processos terapêuticos é, cada vez mais, um tema que precisa ser debatido (Borges, 2015;Freitas, 2014;Machado & Holanda, 2016;Marques, 2017;Neubern, 2013;Paiva, 2021). Contudo, ainda nos deparamos com um abismo considerável a ser atravessado para efetivar a real inclusão da dimensão espiritual na atenção à saúde, especialmente na Psicologia -com as devidas implicações no campo da formação profissional Holanda & Pereira, 2020;Machado et al, 2019;Paiva & Freitas, 2019;Pereira & Holanda, 2016.…”
Section: Introductionunclassified