From Theory to Observational Results: Baryon Acoustic Oscillations Detected at High Redshift Ranges

The current mission from several space science institutions occurring on a global scale is the search for baryon acoustic oscillation (BAO) peaks. In our work, we were able to successfully discover a BAO peak detected by the Dark Energy Spectroscopic Instrument (DESI) Early Data Release (EDR) at a higher redshift range than the current published work. In our study, we chose a selection of 60,431 quasars between redshifts ranges from 2 < z < 3. We followed the methods used by current scientists which was to compute the correlation function, revealing a peak at roughly 110 h-1 Mpc at a significance value of 4 ⋅ 10-73 compared to a correlation function associated with a pure CDM model. The detection of the BAO peak in the DESI EDR is significant as it shows the potential of DESI as a powerful tool to determine the BAO standard ruler across a wide range of redshifts, with the 2025 official DESI data release providing even more data to conduct in-depth studies on BAOs. Based on this result, future analyses can help refine the position of the BAO peak at high redshifts and uncover new values for cosmological parameters within the early universe.