Abstract
A kinematic treatment to trace out the form of f(R) cosmology, within the Palatini formalism, is discussed by only postulating the universe homogeneity and isotropy. To figure this out we build model-independent approximations of the luminosity distance through rational expansions. These approximants extend the Taylor convergence radii computed for usual cosmographic series. We thus consider both Padé and the rational Chebyshev polynomials. They can be used to accurately describe the universe late-time expansion history, providing further information on the thermal properties of all effective cosmic fluids entering the energy momentum tensor of Palatini’s gravity. To perform our numerical analysis, we relate the Palatini’s Ricci scalar with the Hubble parameter H and thus we write down a single differential equation in terms of the redshift z. Therefore, to bound f(R), we make use of the most recent outcomes over the cosmographic parameters obtained from combined data surveys. In particular our clue is to select two scenarios, i.e. (2, 2) Padé and (2, 1) Chebyshev approximations, since they well approximate the luminosity distance at the lowest possible order. We find that best analytical matches to the numerical solutions lead to \(f(R)=a+bR^n\) with free parameters given by the set \((a, b, n)=(-1.627, 0.866, 1.074)\) for (2, 2) Padé approximation, whereas \(f(R)=\alpha +\beta R^m\) with \((\alpha , \beta , m)=(-1.332, 0.749, 1.124)\) for (2, 1) rational Chebyshev approximation. Finally, our results are compared with the \(\Lambda \)CDM predictions and with previous studies in the literature. Slight departures from General Relativity are also discussed.
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Notes
We work in units of \(c=1\).
This choice is perfectly consistent with the results of the Planck collaboration [6], within the \(1\sigma \) errors: \(\Omega _m=0.308 \pm 0.012\).
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This paper is based upon work from COST action CA15117 (CANTATA), supported by COST (European Cooperation in Science and Technology).
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Appendix: Rational approximations of the luminosity distance
Appendix: Rational approximations of the luminosity distance
We here report the (2, 2) Padé and the (2, 1) rational Chebyshev approximations of \(d_L(z)\), respectively:
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Capozziello, S., D’Agostino, R. & Luongo, O. Kinematic model-independent reconstruction of Palatini f(R) cosmology. Gen Relativ Gravit 51, 2 (2019). https://doi.org/10.1007/s10714-018-2483-0
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DOI: https://doi.org/10.1007/s10714-018-2483-0