Interacting Dark Energy after DESI Baryon Acoustic Oscillation measurements

Interacting Dark Energy after DESI Baryon Acoustic Oscillation measurements

2024 | William Giare, Miguel A. Sabogal, Rafael C. Nunes, Eleonora Di Valentino
The authors investigate the implications of Baryon Acoustic Oscillation (BAO) measurements from the Dark Energy Spectroscopic Instrument (DESI) for Interacting Dark Energy (IDE) models, which involve an energy-momentum flow from Dark Matter to Dark Energy. By combining Planck-2018 and DESI data, they find a preference for interactions exceeding the 95% confidence level, yielding a present-day expansion rate \( H_0 = 71.4 \pm 1.5 \) km/s/Mpc, which is consistent with the SH0ES collaboration's measurements. This preference remains robust when including additional data from the expansion rate \( H(z) \) and Type-Ia Supernovae. The IDE framework better explains both high and low redshift data compared to the standard Lambda Cold Dark Matter (LCDM) model, while also yielding higher values of \( H_0 \) that align better with local distance ladder estimates. The results suggest that the DESI data could help resolve the Hubble tension through late-time new physics, specifically in the context of IDE models.The authors investigate the implications of Baryon Acoustic Oscillation (BAO) measurements from the Dark Energy Spectroscopic Instrument (DESI) for Interacting Dark Energy (IDE) models, which involve an energy-momentum flow from Dark Matter to Dark Energy. By combining Planck-2018 and DESI data, they find a preference for interactions exceeding the 95% confidence level, yielding a present-day expansion rate \( H_0 = 71.4 \pm 1.5 \) km/s/Mpc, which is consistent with the SH0ES collaboration's measurements. This preference remains robust when including additional data from the expansion rate \( H(z) \) and Type-Ia Supernovae. The IDE framework better explains both high and low redshift data compared to the standard Lambda Cold Dark Matter (LCDM) model, while also yielding higher values of \( H_0 \) that align better with local distance ladder estimates. The results suggest that the DESI data could help resolve the Hubble tension through late-time new physics, specifically in the context of IDE models.
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