Uncovering the secrets of dark matter is one of the greatest challenges in modern cosmology. In this thought-provoking episode, we're joined by Dr. Giacomo Cacciapaglia, who shares his latest findings on the role of gravitons, hypothetical quantum particles that mediate the force of gravity, in the composition of dark matter.

Dr. Cacciapaglia and his team discovered a chiral enhancement in the production cross sections of massive spin-2 gravitons that may suggest their potential role as dark matter candidates for the freeze-in mechanism. These findings point towards graviton masses in the keV–MeV range, positioning gravitons as sub-MeV dark matter particles, a concept that aligns with our understanding of small-scale galaxy structures.

The team applied their novel calculations to a Randall-Sundrum model with multiple branes, demonstrating a significant parameter space where the first two massive gravitons can account for the dark matter relic density.

Join us as we delve into the intricate world of dark matter, gravitons, and the mysteries of the cosmos with Dr. Cacciapaglia.

Keywords: Dr. Giacomo Cacciapaglia, Dark Matter, Gravitons, Randall-Sundrum Model, Chiral Enhancement, Freeze-in Mechanism, Cosmology, Physics, Astrophysics, Quantum Particles.

DOI: 10.1103/PhysRevLett.128.081806