Monodromic dark energy and DESI

Recent baryon acoustic oscillation (BAO) measurements from the Dark Energy Spectroscopic Instrument (DESI) Collaboration have renewed interest in dynamical dark energy models, particularly those that cross the “phantom divide” ( w DE = − 1 ). We present leading observational constraints on , a physically motivated scalar field dark energy scenario capable of realizing rapid oscillations about the phantom divide. Using cosmic microwave background (CMB) information, DESI DR2 BAO measurements, and type Ia supernova observations, we constrain the amplitude, frequency, phase, and power-law index describing the monodromic k-essence scenario at the background level. We find that the monodromic dark energy…

• FA
  Fondazione Angelo Della Riccia
• NS
  National Science Foundation

  Award: AST-2307727
• NY
  New York State Foundation for Science, Technology and Innovation

  Award: C090171
• UO
  University of Texas at Austin
• NI
  National Institutes of Health

  Award: 1G20RR030893-01