Interacting Dark Energy after DESI Baryon Acoustic Oscillation measurements

Interacting Dark Energy after DESI Baryon Acoustic Oscillation measurements

23 Apr 2024 | William Giarè, Miguel A. Sabogal, Rafael C. Nunes, Eleonora Di Valentino
The paper investigates the implications of the 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 (DM) to Dark Energy (DE). Combining Planck-2018 and DESI data, the study finds 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, consistent with the SH0ES collaboration. This preference remains robust when including measurements of $ H(z) $ from cosmic chronometers and distance moduli from Type Ia Supernovae. The IDE framework can equally or better explain high and low redshift data compared to the $ \Lambda $ CDM model, while yielding higher $ H_0 $ values in better agreement with local distance ladder estimates. The discrepancy between the present-day expansion rate $ H_0 $ measured by SH0ES (73 ± 1 km/s/Mpc) and the Planck collaboration (67.4 ± 0.5 km/s/Mpc) has reached a statistical significance of over 5σ, suggesting a possible need for new physics beyond the standard $ \Lambda $ CDM model. The study explores IDE as a potential solution, where energy-momentum transfer from DM to DE is quantified by a coupling parameter $ \xi $. The analysis shows a preference for $ \xi \neq 0 $ at more than 95% confidence level, with $ \xi = -0.38_{-0.16}^{+0.18} $, indicating a non-vanishing energy-momentum flow from DM to DE. The IDE model can fully resolve the Hubble tension when combined with Planck-2018 and DESI data, and the results are consistent with SH0ES measurements. The study also compares the best-fit predictions of IDE and $ \Lambda $ CDM models against observed cosmic distances, finding that IDE can better explain certain BAO measurements, particularly at z=0.71. The DESI data significantly support the possibility of non-vanishing energy-momentum transfer from DM to DE, resulting in a pronounced negative correlation between $ \xi $ and $ H_0 $. The results suggest that IDE can address the Hubble tension through late-time new physics, as supported by the DESI BAO measurements. The study concludes that DESI data (re-)open the possibility of addressing the Hubble tension through late-time new physics, as argued for IDE.The paper investigates the implications of the 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 (DM) to Dark Energy (DE). Combining Planck-2018 and DESI data, the study finds 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, consistent with the SH0ES collaboration. This preference remains robust when including measurements of $ H(z) $ from cosmic chronometers and distance moduli from Type Ia Supernovae. The IDE framework can equally or better explain high and low redshift data compared to the $ \Lambda $ CDM model, while yielding higher $ H_0 $ values in better agreement with local distance ladder estimates. The discrepancy between the present-day expansion rate $ H_0 $ measured by SH0ES (73 ± 1 km/s/Mpc) and the Planck collaboration (67.4 ± 0.5 km/s/Mpc) has reached a statistical significance of over 5σ, suggesting a possible need for new physics beyond the standard $ \Lambda $ CDM model. The study explores IDE as a potential solution, where energy-momentum transfer from DM to DE is quantified by a coupling parameter $ \xi $. The analysis shows a preference for $ \xi \neq 0 $ at more than 95% confidence level, with $ \xi = -0.38_{-0.16}^{+0.18} $, indicating a non-vanishing energy-momentum flow from DM to DE. The IDE model can fully resolve the Hubble tension when combined with Planck-2018 and DESI data, and the results are consistent with SH0ES measurements. The study also compares the best-fit predictions of IDE and $ \Lambda $ CDM models against observed cosmic distances, finding that IDE can better explain certain BAO measurements, particularly at z=0.71. The DESI data significantly support the possibility of non-vanishing energy-momentum transfer from DM to DE, resulting in a pronounced negative correlation between $ \xi $ and $ H_0 $. The results suggest that IDE can address the Hubble tension through late-time new physics, as supported by the DESI BAO measurements. The study concludes that DESI data (re-)open the possibility of addressing the Hubble tension through late-time new physics, as argued for IDE.
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Understanding Interacting Dark Energy after DESI Baryon Acoustic Oscillation Measurements.