Testing the direction of dark sector interaction using late-time datasets
EUROPEAN PHYSICAL JOURNAL C, cilt.86, sa.10, 2026 (SCI-Expanded, Scopus)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 86 Sayı: 10
- Basım Tarihi: 2026
- Doi Numarası: 10.1140/epjc/s10052-026-16492-4
- Dergi Adı: EUROPEAN PHYSICAL JOURNAL C
- Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Aerospace Database, Chemical Abstracts Core, Compendex, INSPEC, zbMATH, Directory of Open Access Journals, Academic Search Ultimate (EBSCO), Engineering Source (EBSCO), Technology Collection (ProQuest)
- Açık Arşiv Koleksiyonu: AVESİS Açık Erişim Koleksiyonu
- İstanbul Üniversitesi Adresli: Evet
Özet
We constrain the phenomenological interacting dark energy ( xi IDE) model, in which the relative evolution of dark matter and dark energy is characterized by the scaling relation rho(X)/rho(m )proportional to a(xi) , using baryon acoustic oscillation measurements from DESI Data Releases 1 and 2, combined with cosmic chronometers, compressed CMB likelihoods, and the Pantheon + , DES-Dovekie, and Union3 Type Ia supernova samples. Parameter constraints are obtained using the cosmological inference code SimpleMC. Relative to Lambda CDM, the xi IDE model mildly favors higher values of the Hubble constant, reducing but not resolving the H0 tension. The parameter xi remains close to its Lambda CDM limit, while most dataset combinations favor w(X)>-1 , indicating a mild preference for quintessence-like dark energy. The interaction combination xi+3w(X) is negative for all dataset combinations, corresponding to energy transfer from dark energy to dark matter. The strongest deviation from the non-interacting limit is obtained for CMB + DESI DR2 + CC + Union3, with xi+3w(X)=-0.035 +/- 0.023 , corresponding to only 1.52 sigma . Although the N sigma statistic shows a weak preference for the interacting scenario, Bayesian evidence consistently favors Lambda CDM. Overall, observations provide no compelling evidence for a nonzero dark-sector interaction, despite a consistent mild preference for energy transfer from dark energy to dark matter.