{"title":"用f(R,T)重力重构常跳参数","authors":"Anirudh Pradhan , Gopikant Goswami , Aroonkumar Beesham","doi":"10.1016/j.jheap.2023.03.001","DOIUrl":null,"url":null,"abstract":"<div><p>In this work, we have developed an FLRW type model of a universe which displays transition from deceleration in the past to the acceleration at the present. For this, we have considered field equations of f(R,T) gravity and have taken <span><math><mi>f</mi><mo>(</mo><mi>R</mi><mo>,</mo><mi>T</mi><mo>)</mo><mo>=</mo><mi>R</mi><mo>+</mo><mn>2</mn><mi>λ</mi><mi>T</mi></math></span>, <em>λ</em> being an arbitrary constant. We have estimated the <em>λ</em> parameter in such a way that the transition red shift is found similar in the deceleration parameter, pressure and the equation of state parameter <em>ω</em>. The present value of Hubble parameter is estimated on the basis of the three types of observational data set: latest compilation of 46 Hubble data set, SNe Ia 580 data sets of distance modulus and 66 Pantheon data set of apparent magnitude which comprised of 40 SN Ia bined and 26 high redshift data's in the range <span><math><mn>0.014</mn><mo>≤</mo><mi>z</mi><mo>≤</mo><mn>2.26</mn></math></span>. These data are compared with theoretical results through the <span><math><msup><mrow><mi>χ</mi></mrow><mrow><mn>2</mn></mrow></msup></math></span> statistical test. Interestingly, the model satisfies all the three weak, strong and dominant energy conditions. The model fits well with observational findings. We have discussed some of the physical aspects of the model, in particular the age of the universe.</p></div>","PeriodicalId":10,"journal":{"name":"ACS Central Science","volume":null,"pages":null},"PeriodicalIF":12.7000,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"6","resultStr":"{\"title\":\"The reconstruction of constant jerk parameter with f(R,T) gravity\",\"authors\":\"Anirudh Pradhan , Gopikant Goswami , Aroonkumar Beesham\",\"doi\":\"10.1016/j.jheap.2023.03.001\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>In this work, we have developed an FLRW type model of a universe which displays transition from deceleration in the past to the acceleration at the present. For this, we have considered field equations of f(R,T) gravity and have taken <span><math><mi>f</mi><mo>(</mo><mi>R</mi><mo>,</mo><mi>T</mi><mo>)</mo><mo>=</mo><mi>R</mi><mo>+</mo><mn>2</mn><mi>λ</mi><mi>T</mi></math></span>, <em>λ</em> being an arbitrary constant. We have estimated the <em>λ</em> parameter in such a way that the transition red shift is found similar in the deceleration parameter, pressure and the equation of state parameter <em>ω</em>. The present value of Hubble parameter is estimated on the basis of the three types of observational data set: latest compilation of 46 Hubble data set, SNe Ia 580 data sets of distance modulus and 66 Pantheon data set of apparent magnitude which comprised of 40 SN Ia bined and 26 high redshift data's in the range <span><math><mn>0.014</mn><mo>≤</mo><mi>z</mi><mo>≤</mo><mn>2.26</mn></math></span>. These data are compared with theoretical results through the <span><math><msup><mrow><mi>χ</mi></mrow><mrow><mn>2</mn></mrow></msup></math></span> statistical test. Interestingly, the model satisfies all the three weak, strong and dominant energy conditions. The model fits well with observational findings. We have discussed some of the physical aspects of the model, in particular the age of the universe.</p></div>\",\"PeriodicalId\":10,\"journal\":{\"name\":\"ACS Central Science\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":12.7000,\"publicationDate\":\"2023-06-01\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"6\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"ACS Central Science\",\"FirstCategoryId\":\"101\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S2214404823000034\",\"RegionNum\":1,\"RegionCategory\":\"化学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"CHEMISTRY, MULTIDISCIPLINARY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"ACS Central Science","FirstCategoryId":"101","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S2214404823000034","RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CHEMISTRY, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 6
摘要
在这项工作中,我们开发了一个FLRW类型的宇宙模型,该模型显示了从过去的减速到现在的加速的转变。为此,我们考虑了f(R,T)重力的场方程,并取f(R、T)=R+2λT,λ为任意常数。我们估计λ参数的方式是,在减速参数、压力和状态方程参数ω中发现过渡红移相似。哈勃参数的现值是根据三种类型的观测数据集估计的:46个哈勃数据集、SNe Ia 580距离模量数据集和66个Pantheon视星等数据集的最新汇编,其中包括40个SN Ia组合数据和26个高红移数据,范围在0.014≤z≤2.26。通过χ2统计检验将这些数据与理论结果进行了比较。有趣的是,该模型满足所有三个弱、强和主导能量条件。该模型与观测结果非常吻合。我们已经讨论了该模型的一些物理方面,特别是宇宙的年龄。
The reconstruction of constant jerk parameter with f(R,T) gravity
In this work, we have developed an FLRW type model of a universe which displays transition from deceleration in the past to the acceleration at the present. For this, we have considered field equations of f(R,T) gravity and have taken , λ being an arbitrary constant. We have estimated the λ parameter in such a way that the transition red shift is found similar in the deceleration parameter, pressure and the equation of state parameter ω. The present value of Hubble parameter is estimated on the basis of the three types of observational data set: latest compilation of 46 Hubble data set, SNe Ia 580 data sets of distance modulus and 66 Pantheon data set of apparent magnitude which comprised of 40 SN Ia bined and 26 high redshift data's in the range . These data are compared with theoretical results through the statistical test. Interestingly, the model satisfies all the three weak, strong and dominant energy conditions. The model fits well with observational findings. We have discussed some of the physical aspects of the model, in particular the age of the universe.
期刊介绍:
ACS Central Science publishes significant primary reports on research in chemistry and allied fields where chemical approaches are pivotal. As the first fully open-access journal by the American Chemical Society, it covers compelling and important contributions to the broad chemistry and scientific community. "Central science," a term popularized nearly 40 years ago, emphasizes chemistry's central role in connecting physical and life sciences, and fundamental sciences with applied disciplines like medicine and engineering. The journal focuses on exceptional quality articles, addressing advances in fundamental chemistry and interdisciplinary research.