{"title":"Power law cosmology in Gauss-Bonnet gravity with pragmatic analysis","authors":"Rita Rani , Shaily , G.K. Goswami , J.K. Singh","doi":"10.1016/j.jheap.2024.11.021","DOIUrl":null,"url":null,"abstract":"<div><div>In this study, we present an approach <span><math><mi>f</mi><mo>(</mo><mi>R</mi><mo>,</mo><mi>G</mi><mo>)</mo></math></span> gravity incorporating power law in <em>G</em>. To study the cosmic evolution of the universe given by the reconstruction of the Hubble parameter given by <span><math><mi>E</mi><mo>(</mo><mi>z</mi><mo>)</mo><mo>=</mo><msup><mrow><mo>(</mo><mn>1</mn><mo>+</mo><mfrac><mrow><mi>z</mi><mo>(</mo><mi>α</mi><mo>+</mo><msup><mrow><mo>(</mo><mn>1</mn><mo>+</mo><mi>z</mi><mo>)</mo></mrow><mrow><mi>β</mi></mrow></msup><mo>)</mo></mrow><mrow><mn>2</mn><mi>β</mi><mo>+</mo><mn>1</mn></mrow></mfrac><mo>)</mo></mrow><mrow><mfrac><mrow><mn>3</mn></mrow><mrow><mn>2</mn><mi>β</mi></mrow></mfrac></mrow></msup></math></span>. Subsequently, we use various recent observational datasets of OHD, Pantheon, and BAO to estimate the model parameters <span><math><msub><mrow><mi>H</mi></mrow><mrow><mn>0</mn></mrow></msub><mo>,</mo><mspace></mspace><mi>α</mi></math></span>, and <em>β</em> applying the Markov Chain Monte Carlo (MCMC) technique in the emcee package to establish the validity of the model. In our findings, we observe that our model shows consistency with standard ΛCDM, transits from deceleration to acceleration, and enters the quintessence region in late times. The cosmological model satisfies necessary energy constraints, simultaneously violating the strong energy condition (SEC), indicating a repulsive nature and consistent with accelerated expansion. The cosmic evolution of the Hawking temperature and the total entropy for the various observational datasets also show the validity of the model. Thus, our established model demonstrates sufficient potential for explicitly describing cosmological models.</div></div>","PeriodicalId":54265,"journal":{"name":"Journal of High Energy Astrophysics","volume":"45 ","pages":"Pages 168-180"},"PeriodicalIF":10.2000,"publicationDate":"2024-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of High Energy Astrophysics","FirstCategoryId":"101","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S221440482400140X","RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ASTRONOMY & ASTROPHYSICS","Score":null,"Total":0}
引用次数: 0
Abstract
In this study, we present an approach gravity incorporating power law in G. To study the cosmic evolution of the universe given by the reconstruction of the Hubble parameter given by . Subsequently, we use various recent observational datasets of OHD, Pantheon, and BAO to estimate the model parameters , and β applying the Markov Chain Monte Carlo (MCMC) technique in the emcee package to establish the validity of the model. In our findings, we observe that our model shows consistency with standard ΛCDM, transits from deceleration to acceleration, and enters the quintessence region in late times. The cosmological model satisfies necessary energy constraints, simultaneously violating the strong energy condition (SEC), indicating a repulsive nature and consistent with accelerated expansion. The cosmic evolution of the Hawking temperature and the total entropy for the various observational datasets also show the validity of the model. Thus, our established model demonstrates sufficient potential for explicitly describing cosmological models.
期刊介绍:
The journal welcomes manuscripts on theoretical models, simulations, and observations of highly energetic astrophysical objects both in our Galaxy and beyond. Among those, black holes at all scales, neutron stars, pulsars and their nebula, binaries, novae and supernovae, their remnants, active galaxies, and clusters are just a few examples. The journal will consider research across the whole electromagnetic spectrum, as well as research using various messengers, such as gravitational waves or neutrinos. Effects of high-energy phenomena on cosmology and star-formation, results from dedicated surveys expanding the knowledge of extreme environments, and astrophysical implications of dark matter are also welcomed topics.