Luis A. Escamilla, Supriya Pan, Eleonora Di Valentino, Andronikos Paliathanasis, José Alberto Vázquez, Weiqiang Yang
{"title":"测试暗能量的振荡行为","authors":"Luis A. Escamilla, Supriya Pan, Eleonora Di Valentino, Andronikos Paliathanasis, José Alberto Vázquez, Weiqiang Yang","doi":"10.1103/physrevd.111.023531","DOIUrl":null,"url":null,"abstract":"The main aim of this work is to use a model-independent approach, along with late-time observational probes, to reconstruct the dark energy (DE) equation of state w</a:mi></a:mrow>DE</a:mi></a:mrow></a:msub>(</a:mo>z</a:mi>)</a:mo></a:mrow></a:math>. Our analysis showed that, for a late time universe, <e:math xmlns:e=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><e:msub><e:mi>w</e:mi><e:mrow><e:mi>DE</e:mi></e:mrow></e:msub></e:math> deviates from being a constant but in contrast exhibits an oscillatory behavior, hence both quintessence (<g:math xmlns:g=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><g:msub><g:mi>w</g:mi><g:mrow><g:mi>DE</g:mi></g:mrow></g:msub><g:mo>></g:mo><g:mo>−</g:mo><g:mn>1</g:mn></g:math>) and phantom (<i:math xmlns:i=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><i:msub><i:mi>w</i:mi><i:mrow><i:mi>DE</i:mi></i:mrow></i:msub><i:mo><</i:mo><i:mo>−</i:mo><i:mn>1</i:mn></i:math>) regimes are equally allowed. In order to portray this oscillatory behavior, we explored various parametrizations for the equation of state and identified the closest approximation based on the goodness of fit with the data and the Bayesian evidence analysis. Our findings indicated that while all considered oscillating DE parametrizations provide a better fit to the data, when compared to the cosmological constant, they are penalized in the Bayesian evidence analysis due to the additional free parameters. Overall, the present article demonstrates that, in the low redshift regime, the equation of state of the DE prefers to be dynamical and oscillating. We anticipate that future cosmological probes will take a stand in this direction. <jats:supplementary-material> <jats:copyright-statement>Published by the American Physical Society</jats:copyright-statement> <jats:copyright-year>2025</jats:copyright-year> </jats:permissions> </jats:supplementary-material>","PeriodicalId":20167,"journal":{"name":"Physical Review D","volume":"25 1","pages":""},"PeriodicalIF":5.0000,"publicationDate":"2025-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Testing an oscillatory behavior of dark energy\",\"authors\":\"Luis A. Escamilla, Supriya Pan, Eleonora Di Valentino, Andronikos Paliathanasis, José Alberto Vázquez, Weiqiang Yang\",\"doi\":\"10.1103/physrevd.111.023531\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"The main aim of this work is to use a model-independent approach, along with late-time observational probes, to reconstruct the dark energy (DE) equation of state w</a:mi></a:mrow>DE</a:mi></a:mrow></a:msub>(</a:mo>z</a:mi>)</a:mo></a:mrow></a:math>. Our analysis showed that, for a late time universe, <e:math xmlns:e=\\\"http://www.w3.org/1998/Math/MathML\\\" display=\\\"inline\\\"><e:msub><e:mi>w</e:mi><e:mrow><e:mi>DE</e:mi></e:mrow></e:msub></e:math> deviates from being a constant but in contrast exhibits an oscillatory behavior, hence both quintessence (<g:math xmlns:g=\\\"http://www.w3.org/1998/Math/MathML\\\" display=\\\"inline\\\"><g:msub><g:mi>w</g:mi><g:mrow><g:mi>DE</g:mi></g:mrow></g:msub><g:mo>></g:mo><g:mo>−</g:mo><g:mn>1</g:mn></g:math>) and phantom (<i:math xmlns:i=\\\"http://www.w3.org/1998/Math/MathML\\\" display=\\\"inline\\\"><i:msub><i:mi>w</i:mi><i:mrow><i:mi>DE</i:mi></i:mrow></i:msub><i:mo><</i:mo><i:mo>−</i:mo><i:mn>1</i:mn></i:math>) regimes are equally allowed. In order to portray this oscillatory behavior, we explored various parametrizations for the equation of state and identified the closest approximation based on the goodness of fit with the data and the Bayesian evidence analysis. Our findings indicated that while all considered oscillating DE parametrizations provide a better fit to the data, when compared to the cosmological constant, they are penalized in the Bayesian evidence analysis due to the additional free parameters. Overall, the present article demonstrates that, in the low redshift regime, the equation of state of the DE prefers to be dynamical and oscillating. 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The main aim of this work is to use a model-independent approach, along with late-time observational probes, to reconstruct the dark energy (DE) equation of state wDE(z). Our analysis showed that, for a late time universe, wDE deviates from being a constant but in contrast exhibits an oscillatory behavior, hence both quintessence (wDE>−1) and phantom (wDE<−1) regimes are equally allowed. In order to portray this oscillatory behavior, we explored various parametrizations for the equation of state and identified the closest approximation based on the goodness of fit with the data and the Bayesian evidence analysis. Our findings indicated that while all considered oscillating DE parametrizations provide a better fit to the data, when compared to the cosmological constant, they are penalized in the Bayesian evidence analysis due to the additional free parameters. Overall, the present article demonstrates that, in the low redshift regime, the equation of state of the DE prefers to be dynamical and oscillating. We anticipate that future cosmological probes will take a stand in this direction. Published by the American Physical Society2025
期刊介绍：
Physical Review D (PRD) is a leading journal in elementary particle physics, field theory, gravitation, and cosmology and is one of the top-cited journals in high-energy physics.
PRD covers experimental and theoretical results in all aspects of particle physics, field theory, gravitation and cosmology, including:
Particle physics experiments,
Electroweak interactions,
Strong interactions,
Lattice field theories, lattice QCD,
Beyond the standard model physics,
Phenomenological aspects of field theory, general methods,
Gravity, cosmology, cosmic rays,
Astrophysics and astroparticle physics,
General relativity,
Formal aspects of field theory, field theory in curved space,
String theory, quantum gravity, gauge/gravity duality.
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