Interacting dark sectors in light of DESI DR2
Article Type
Research Article
Publication Title
Monthly Notices of the Royal Astronomical Society
Abstract
Possible interaction between dark energy and dark matter has previously shown promise in alleviating the clustering tension, without exacerbating the Hubble tension, when Baryon Acoustic Oscillations (BAO) data from the Sloan Digital Sky Survey (SDSS) DR16 is combined with Cosmic Microwave Background (CMB) and Type-Ia Supernovae (SNIa) data sets. With the recent Dark Energy Spectroscopic Instrument (DESI) BAO DR2, there is now a compelling need to re-evaluate this scenario. We combine DESI DR2 with Planck 2018 and Pantheon + SNIa data sets to constrain interacting dark matter dark energy models, accounting for interaction effects in both the background and perturbation sectors. Our results exhibit similar trends to those observed with SDSS, albeit with improved precision, reinforcing the consistency between the two BAO data sets. In addition to offering a resolution to the tension, in the phantom-limit, the dark energy equation of state exhibits an early-phantom behaviour, aligning with DESI DR2 findings, before transitioning to at lower redshifts, regardless of the DE parametrization. However, the statistical significance of excluding is reduced compared to their non-interacting counterparts.
First Page
2936
Last Page
2942
DOI
10.1093/mnras/staf1442
Publication Date
10-1-2025
Recommended Citation
Shah, Rahul; Mukherjee, Purba; and Pal, Supratik, "Interacting dark sectors in light of DESI DR2" (2025). Journal Articles. 5437.
https://digitalcommons.isical.ac.in/journal-articles/5437