Marcel van der Westhuizen , David Figueruelo , Rethabile Thubisi , Shambel Sahlu , Amare Abebe , Andronikos Paliathanasis
{"title":"DESI DR2 BAO数据后宇宙黑暗区域的划分","authors":"Marcel van der Westhuizen , David Figueruelo , Rethabile Thubisi , Shambel Sahlu , Amare Abebe , Andronikos Paliathanasis","doi":"10.1016/j.dark.2025.102107","DOIUrl":null,"url":null,"abstract":"<div><div>We study a non-linear interaction between the dark matter and dark energy components of the universe. Within a spatially flat FLRW geometry, dark matter is described by a dust fluid and dark energy by an ideal gas with a constant equation-of-state parameter, allowing for energy transfer between the two sectors. The resulting effective fluid leads to a unified dynamical dark energy model in which the Hubble function admits an analytic expression. We constrain this model using the DESI DR2 Baryon Acoustic Oscillation (BAO) measurements and the Pantheon+ Type Ia supernovae (SNe Ia) compilation. For the combined dataset, the interacting model provides a better fit than <span><math><mi>Λ</mi></math></span>CDM, with <span><math><mrow><msubsup><mrow><mi>χ</mi></mrow><mrow><mi>Interaction</mi></mrow><mrow><mn>2</mn></mrow></msubsup><mo>−</mo><msubsup><mrow><mi>χ</mi></mrow><mrow><mi>Λ</mi><mi>CDM</mi></mrow><mrow><mn>2</mn></mrow></msubsup><mo>=</mo><mo>−</mo><mn>5</mn></mrow></math></span>. Using the Akaike Information Criterion (AIC), we find <span><math><mrow><msub><mrow><mtext>AIC</mtext></mrow><mrow><mi>Interaction</mi></mrow></msub><mo>−</mo><msub><mrow><mtext>AIC</mtext></mrow><mrow><mi>Λ</mi><mi>CDM</mi></mrow></msub><mo>=</mo><mo>−</mo><mn>1</mn></mrow></math></span>, indicating that the interacting model is weakly preferred, though the difference is not statistically significant and disappears when considering BAO data alone. Finally, when comparing the interaction with the <span><math><mrow><msub><mrow><mi>w</mi></mrow><mrow><mn>0</mn></mrow></msub><msub><mrow><mi>w</mi></mrow><mrow><mi>a</mi></mrow></msub></mrow></math></span>CDM (CPL) model, we find a small preference for the interaction in the BAO-only case, with <span><math><mrow><msub><mrow><mtext>AIC</mtext></mrow><mrow><mi>Interaction</mi></mrow></msub><mo>−</mo><msub><mrow><mtext>AIC</mtext></mrow><mrow><msub><mrow><mi>w</mi></mrow><mrow><mn>0</mn></mrow></msub><msub><mrow><mi>w</mi></mrow><mrow><mi>a</mi></mrow></msub></mrow></msub><mo>=</mo><mo>−</mo><mn>1</mn><mo>.</mo><mn>5</mn></mrow></math></span>.</div></div>","PeriodicalId":48774,"journal":{"name":"Physics of the Dark Universe","volume":"50 ","pages":"Article 102107"},"PeriodicalIF":6.4000,"publicationDate":"2025-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Compartmentalization in the dark sector of the universe after DESI DR2 BAO data\",\"authors\":\"Marcel van der Westhuizen , David Figueruelo , Rethabile Thubisi , Shambel Sahlu , Amare Abebe , Andronikos Paliathanasis\",\"doi\":\"10.1016/j.dark.2025.102107\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><div>We study a non-linear interaction between the dark matter and dark energy components of the universe. Within a spatially flat FLRW geometry, dark matter is described by a dust fluid and dark energy by an ideal gas with a constant equation-of-state parameter, allowing for energy transfer between the two sectors. The resulting effective fluid leads to a unified dynamical dark energy model in which the Hubble function admits an analytic expression. We constrain this model using the DESI DR2 Baryon Acoustic Oscillation (BAO) measurements and the Pantheon+ Type Ia supernovae (SNe Ia) compilation. For the combined dataset, the interacting model provides a better fit than <span><math><mi>Λ</mi></math></span>CDM, with <span><math><mrow><msubsup><mrow><mi>χ</mi></mrow><mrow><mi>Interaction</mi></mrow><mrow><mn>2</mn></mrow></msubsup><mo>−</mo><msubsup><mrow><mi>χ</mi></mrow><mrow><mi>Λ</mi><mi>CDM</mi></mrow><mrow><mn>2</mn></mrow></msubsup><mo>=</mo><mo>−</mo><mn>5</mn></mrow></math></span>. Using the Akaike Information Criterion (AIC), we find <span><math><mrow><msub><mrow><mtext>AIC</mtext></mrow><mrow><mi>Interaction</mi></mrow></msub><mo>−</mo><msub><mrow><mtext>AIC</mtext></mrow><mrow><mi>Λ</mi><mi>CDM</mi></mrow></msub><mo>=</mo><mo>−</mo><mn>1</mn></mrow></math></span>, indicating that the interacting model is weakly preferred, though the difference is not statistically significant and disappears when considering BAO data alone. Finally, when comparing the interaction with the <span><math><mrow><msub><mrow><mi>w</mi></mrow><mrow><mn>0</mn></mrow></msub><msub><mrow><mi>w</mi></mrow><mrow><mi>a</mi></mrow></msub></mrow></math></span>CDM (CPL) model, we find a small preference for the interaction in the BAO-only case, with <span><math><mrow><msub><mrow><mtext>AIC</mtext></mrow><mrow><mi>Interaction</mi></mrow></msub><mo>−</mo><msub><mrow><mtext>AIC</mtext></mrow><mrow><msub><mrow><mi>w</mi></mrow><mrow><mn>0</mn></mrow></msub><msub><mrow><mi>w</mi></mrow><mrow><mi>a</mi></mrow></msub></mrow></msub><mo>=</mo><mo>−</mo><mn>1</mn><mo>.</mo><mn>5</mn></mrow></math></span>.</div></div>\",\"PeriodicalId\":48774,\"journal\":{\"name\":\"Physics of the Dark Universe\",\"volume\":\"50 \",\"pages\":\"Article 102107\"},\"PeriodicalIF\":6.4000,\"publicationDate\":\"2025-09-27\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Physics of the Dark Universe\",\"FirstCategoryId\":\"101\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S2212686425003000\",\"RegionNum\":2,\"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}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Physics of the Dark Universe","FirstCategoryId":"101","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S2212686425003000","RegionNum":2,"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}
Compartmentalization in the dark sector of the universe after DESI DR2 BAO data
We study a non-linear interaction between the dark matter and dark energy components of the universe. Within a spatially flat FLRW geometry, dark matter is described by a dust fluid and dark energy by an ideal gas with a constant equation-of-state parameter, allowing for energy transfer between the two sectors. The resulting effective fluid leads to a unified dynamical dark energy model in which the Hubble function admits an analytic expression. We constrain this model using the DESI DR2 Baryon Acoustic Oscillation (BAO) measurements and the Pantheon+ Type Ia supernovae (SNe Ia) compilation. For the combined dataset, the interacting model provides a better fit than CDM, with . Using the Akaike Information Criterion (AIC), we find , indicating that the interacting model is weakly preferred, though the difference is not statistically significant and disappears when considering BAO data alone. Finally, when comparing the interaction with the CDM (CPL) model, we find a small preference for the interaction in the BAO-only case, with .
期刊介绍:
Physics of the Dark Universe is an innovative online-only journal that offers rapid publication of peer-reviewed, original research articles considered of high scientific impact.
The journal is focused on the understanding of Dark Matter, Dark Energy, Early Universe, gravitational waves and neutrinos, covering all theoretical, experimental and phenomenological aspects.