3 papers
astro-ph.CO2024
First Constraints on a Pixelated Universe in Light of DESI
Jonathan J. Heckman, Omar F. Ramadan, Jeremy Sakstein
Pixelated dark energy is a string theory scenario with a quantum mechanically stable cosmological constant. The number of pixels that make up the universe slowly increases, manifes…
hep-ph2024
Cosmology and Astrophysics of CP-Violating Axions
Omar F. Ramadan, Jeremy Sakstein, Djuna Croon
We study the cosmology and astrophysics of axion-like particles (ALPs) with CP-violating Yukawa couplings to nucleons. At finite nucleon density, the ALP's dynamics is governed by…
astro-ph.CO2024
DESI Constraints on Exponential Quintessence
Omar F. Ramadan, Jeremy Sakstein, David Rubin
The DESI collaboration have recently analyzed their first year of data, finding a preference for thawing dark energy scenarios when using parameterized equations of state for dark…