{"title":"Evolutionary phases of the accelerating universe in modified gravity and its solar system test","authors":"Tame Achi, H. S. Singh","doi":"10.1139/cjp-2023-0090","DOIUrl":null,"url":null,"abstract":"Einstein’s gravity is modified to explain an accelerating universe’s present and past scenarios by numerically exploring different cosmological parameters. A new f(R) gravity model constrained with coupling constants is introduced in the Einstein-Hilbert action to explain current issues and open up new possibilities in gravity physics by fitting the model with newly collected data from observations. It is proposed that the current universe is undergoing an accelerating expansion which behaves as Chaplygin Gas-type dark energy. The values of the coupling constants involved in f(R) gravity are chosen so that the current value of the effective equation of state (ωeff0) is shown within the observational approximation, that is, between −0.8 and −1.0. Cosmological parameters such as deceleration, cosmic jerk, and snap are consistent with the fundamental observational constraint, and their relevance in terms of coupling constant is also emphasized. The viability of the model as well as the existence and origin of scalaron mass are also investigated.","PeriodicalId":9413,"journal":{"name":"Canadian Journal of Physics","volume":"69 1","pages":""},"PeriodicalIF":1.1000,"publicationDate":"2023-06-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Canadian Journal of Physics","FirstCategoryId":"101","ListUrlMain":"https://doi.org/10.1139/cjp-2023-0090","RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"PHYSICS, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
Abstract
Einstein’s gravity is modified to explain an accelerating universe’s present and past scenarios by numerically exploring different cosmological parameters. A new f(R) gravity model constrained with coupling constants is introduced in the Einstein-Hilbert action to explain current issues and open up new possibilities in gravity physics by fitting the model with newly collected data from observations. It is proposed that the current universe is undergoing an accelerating expansion which behaves as Chaplygin Gas-type dark energy. The values of the coupling constants involved in f(R) gravity are chosen so that the current value of the effective equation of state (ωeff0) is shown within the observational approximation, that is, between −0.8 and −1.0. Cosmological parameters such as deceleration, cosmic jerk, and snap are consistent with the fundamental observational constraint, and their relevance in terms of coupling constant is also emphasized. The viability of the model as well as the existence and origin of scalaron mass are also investigated.
期刊介绍:
The Canadian Journal of Physics publishes research articles, rapid communications, and review articles that report significant advances in research in physics, including atomic and molecular physics; condensed matter; elementary particles and fields; nuclear physics; gases, fluid dynamics, and plasmas; electromagnetism and optics; mathematical physics; interdisciplinary, classical, and applied physics; relativity and cosmology; physics education research; statistical mechanics and thermodynamics; quantum physics and quantum computing; gravitation and string theory; biophysics; aeronomy and space physics; and astrophysics.