Princeton University Gravity Initiative Seminar

Abstract: Motivated by Swampland conjectures, I will present a string theory inspired cosmological model with a coupled dark sector that evolves with a scalar field. When fitted to the recent DESI DR2 results (together with the CMB data and supernova data), this model is statistically comparable to the CPL parameterization in outperforming LCDM! Being physically well-motivated, this model provides an intuitive understanding of the role each cosmological dataset plays throughout the cosmological evolution. Furthermore, this model demystifies the “phantom behavior” of dark energy suggested by the CPL parametrization and has predictions for the fifth force.