{"title":"Possible evidences from H(z) parameter data for physics beyond ΛCDM","authors":"Rong-Jia Yang","doi":"10.1016/j.newast.2023.102180","DOIUrl":null,"url":null,"abstract":"<div><p>We analyze <span><math><mrow><mi>H</mi><mrow><mo>(</mo><mi>z</mi><mo>)</mo></mrow></mrow></math></span> parameter data with some conditions by using Lagrange mean value theorem in Calculus. We find that: (1) there exists decelerated phase at 1 <span><math><mi>σ</mi></math></span> confidence level in the redshift range <span><math><mrow><mo>(</mo><mn>0</mn><mo>.</mo><mn>38</mn><mo>,</mo><mn>0</mn><mo>.</mo><mn>59</mn><mo>)</mo></mrow></math></span>; (2) the equation of state of dark energy may be less than <span><math><mrow><mo>−</mo><mn>1</mn></mrow></math></span> at 1 <span><math><mi>σ</mi></math></span> confidence level at some redshifts in the redshift range <span><math><mrow><mo>(</mo><mn>1</mn><mo>.</mo><mn>3</mn><mo>,</mo><mn>1</mn><mo>.</mo><mn>53</mn><mo>)</mo></mrow></math></span>; (3) there exists accelerated phase at 1 <span><math><mi>σ</mi></math></span> confidence level in the redshift range <span><math><mrow><mo>(</mo><mn>1</mn><mo>.</mo><mn>037</mn><mo>,</mo><mn>1</mn><mo>.</mo><mn>944</mn><mo>)</mo></mrow></math></span>. These results may provide possible evidences for physics beyond <span><math><mi>Λ</mi></math></span>CDM.</p></div>","PeriodicalId":54727,"journal":{"name":"New Astronomy","volume":"108 ","pages":"Article 102180"},"PeriodicalIF":1.9000,"publicationDate":"2023-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S1384107623001811/pdfft?md5=cb4f49c0ba75364e3eca93a0e4d11d81&pid=1-s2.0-S1384107623001811-main.pdf","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"New Astronomy","FirstCategoryId":"101","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S1384107623001811","RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"ASTRONOMY & ASTROPHYSICS","Score":null,"Total":0}
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Abstract
We analyze parameter data with some conditions by using Lagrange mean value theorem in Calculus. We find that: (1) there exists decelerated phase at 1 confidence level in the redshift range ; (2) the equation of state of dark energy may be less than at 1 confidence level at some redshifts in the redshift range ; (3) there exists accelerated phase at 1 confidence level in the redshift range . These results may provide possible evidences for physics beyond CDM.
期刊介绍：
New Astronomy publishes articles in all fields of astronomy and astrophysics, with a particular focus on computational astronomy: mathematical and astronomy techniques and methodology, simulations, modelling and numerical results and computational techniques in instrumentation.
New Astronomy includes full length research articles and review articles. The journal covers solar, stellar, galactic and extragalactic astronomy and astrophysics. It reports on original research in all wavelength bands, ranging from radio to gamma-ray.
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