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Extended cosmology in Palatini f (R)-theories

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Extended cosmology in Palatini f (R)-theories. / Pinto, Paolo; Del Vecchio, L.; Fatibene, L.; Ferraris, M.

In: Journal of Cosmology and Astroparticle Physics, Vol. 2018, No. 11, 044, 27.11.2018.

Research output: Contribution to journalJournal articlepeer-review

Harvard

Pinto, P, Del Vecchio, L, Fatibene, L & Ferraris, M 2018, 'Extended cosmology in Palatini f (R)-theories', Journal of Cosmology and Astroparticle Physics, vol. 2018, no. 11, 044. https://doi.org/10.1088/1475-7516/2018/11/044

APA

Pinto, P., Del Vecchio, L., Fatibene, L., & Ferraris, M. (2018). Extended cosmology in Palatini f (R)-theories. Journal of Cosmology and Astroparticle Physics, 2018(11), [044]. https://doi.org/10.1088/1475-7516/2018/11/044

Vancouver

Pinto P, Del Vecchio L, Fatibene L, Ferraris M. Extended cosmology in Palatini f (R)-theories. Journal of Cosmology and Astroparticle Physics. 2018 Nov 27;2018(11). 044. https://doi.org/10.1088/1475-7516/2018/11/044

Author

Pinto, Paolo ; Del Vecchio, L. ; Fatibene, L. ; Ferraris, M. / Extended cosmology in Palatini f (R)-theories. In: Journal of Cosmology and Astroparticle Physics. 2018 ; Vol. 2018, No. 11.

Bibtex

@article{498897daca4549099d5f6579edeb48de,
title = "Extended cosmology in Palatini f (R)-theories",
abstract = "Abstract. We consider the cosmological models based on Palatini f (R)-theory for the function f (R) = αR − 2 β R2 − 3R γ , which, when only dust visible matter is considered, is called dune cosmology in view of the shape of the function f (R(a)) (being a the scale factor). We discuss the meaning of solving the model, and interpret it according to the Ehlers-Pirani-Schild framework as defining a Weyl geometry on spacetime.Accordingly, we extend the definitions of luminosity distance, proper distance, and red-shift to Weyl geometries and fit the values of parameters to SNIa data. Since the theoretical prediction is model-dependent, we argue that the fit is affected by an extra choice, namely a model for atomic clocks, which, in principle, produces observable effects. To the best of our knowledge, these effects have not being considered in the literature before.",
keywords = "dark energy theory, gravity, modified gravity, supernova type Ia - standard candles",
author = "Paolo Pinto and {Del Vecchio}, L. and L. Fatibene and M. Ferraris",
year = "2018",
month = nov,
day = "27",
doi = "10.1088/1475-7516/2018/11/044",
language = "English",
volume = "2018",
journal = "Journal of Cosmology and Astroparticle Physics",
issn = "1475-7516",
publisher = "IOP Publishing",
number = "11",

}

RIS

TY - JOUR

T1 - Extended cosmology in Palatini f (R)-theories

AU - Pinto, Paolo

AU - Del Vecchio, L.

AU - Fatibene, L.

AU - Ferraris, M.

PY - 2018/11/27

Y1 - 2018/11/27

N2 - Abstract. We consider the cosmological models based on Palatini f (R)-theory for the function f (R) = αR − 2 β R2 − 3R γ , which, when only dust visible matter is considered, is called dune cosmology in view of the shape of the function f (R(a)) (being a the scale factor). We discuss the meaning of solving the model, and interpret it according to the Ehlers-Pirani-Schild framework as defining a Weyl geometry on spacetime.Accordingly, we extend the definitions of luminosity distance, proper distance, and red-shift to Weyl geometries and fit the values of parameters to SNIa data. Since the theoretical prediction is model-dependent, we argue that the fit is affected by an extra choice, namely a model for atomic clocks, which, in principle, produces observable effects. To the best of our knowledge, these effects have not being considered in the literature before.

AB - Abstract. We consider the cosmological models based on Palatini f (R)-theory for the function f (R) = αR − 2 β R2 − 3R γ , which, when only dust visible matter is considered, is called dune cosmology in view of the shape of the function f (R(a)) (being a the scale factor). We discuss the meaning of solving the model, and interpret it according to the Ehlers-Pirani-Schild framework as defining a Weyl geometry on spacetime.Accordingly, we extend the definitions of luminosity distance, proper distance, and red-shift to Weyl geometries and fit the values of parameters to SNIa data. Since the theoretical prediction is model-dependent, we argue that the fit is affected by an extra choice, namely a model for atomic clocks, which, in principle, produces observable effects. To the best of our knowledge, these effects have not being considered in the literature before.

KW - dark energy theory

KW - gravity

KW - modified gravity

KW - supernova type Ia - standard candles

U2 - 10.1088/1475-7516/2018/11/044

DO - 10.1088/1475-7516/2018/11/044

M3 - Journal article

VL - 2018

JO - Journal of Cosmology and Astroparticle Physics

JF - Journal of Cosmology and Astroparticle Physics

SN - 1475-7516

IS - 11

M1 - 044

ER -