Publication:
Constraints on Cosmographic Functions of Cosmic Chronometers Data Using Gaussian Processes

Дата
2022
Авторы
Velasquez-Toribio, A. M.
Fabris, J. C.
Journal Title
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Научные группы
Организационные подразделения
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Организационная единица
Институт ядерной физики и технологий
Цель ИЯФиТ и стратегия развития - создание и развитие научно-образовательного центра мирового уровня в области ядерной физики и технологий, радиационного материаловедения, физики элементарных частиц, астрофизики и космофизики.
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Аннотация
© 2022, The Author(s) under exclusive licence to Sociedade Brasileira de Física.We study observational constraints on the cosmographic functions up to the fourth derivative of the scale factor with respect to cosmic time, i.e., the so-called snap function, using the nonparametric method of Gaussian processes. As observational data, we use the Hubble parameter data. Also we use mock data sets to estimate the future forecast and study the performance of this type of data to constrain cosmographic functions. The combination between a nonparametric method and the Hubble parameter data is investigated as a strategy to reconstruct cosmographic functions. In addition, our results are quite general because they are not restricted to a specific type of functional dependency of the Hubble parameter. We investigate some advantages of using cosmographic functions instead of cosmographic series, since the former are general definitions free of approximations. In general, our results do not deviate significantly from Λ CDM. We determine a transition redshift ztr=0.637-0.175+0.165 and H= 69.45 ± 4.34. Also assuming priors for the Hubble constant, we obtain ztr=0.670-0.120+0210 with H= 67.44 (Planck) and ztr=0.710-0.111+0.159 with H= 74.03 (SH0ES). Our main results are summarized in Table 2.
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Цитирование
Velasquez-Toribio, A. M. Constraints on Cosmographic Functions of Cosmic Chronometers Data Using Gaussian Processes / Velasquez-Toribio, A.M., Fabris, J.C. // Brazilian Journal of Physics. - 2022. - 52. - № 4. - 10.1007/s13538-022-01113-8
URI
https://www.doi.org/10.1007/s13538-022-01113-8
 https://www.scopus.com/record/display.uri?eid=2-s2.0-85129330009&origin=resultslist
 http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=Alerting&SrcApp=Alerting&DestApp=WOS_CPL&DestLinkType=FullRecord&UT=WOS:000790198300001
 https://openrepository.mephi.ru/handle/123456789/29043
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