9 papers · 1 filter
The Cosmological Moduli Problem and Preheating
G. F. Giudice, A. Riotto, I. Tkachev
Many models of supersymmetry breaking, in the context of either supergravity or superstring theories, predict the presence of particles with Planck-suppressed couplings and masses…
Standard Model Neutrinos as Warm Dark Matter
Gian F. Giudice, Edward W. Kolb, Antonio Riotto +2
Standard Model neutrinos are not usually considered plausible dark matter candidates because the usual treatment of their decoupling in the early universe implies that their mass m…
Thermal and Non-Thermal Production of Gravitinos in the Early Universe
G. F. Giudice, A. Riotto, I. Tkachev
The excessive production of gravitinos in the early universe destroys the successful predictions of nucleosynthesis. The thermal generation of gravitinos after inflation leads to t…
Probing Planckian physics: resonant production of particles during inflation and features in the primordial power spectrum
Daniel J. H. Chung, Edward W. Kolb, Antonio Riotto +1
The phenomenon of resonant production of particles {\it after} inflation has received much attention in the past few years. In a new application of resonant production of particles…
Non-Thermal Production of Dangerous Relics in the Early Universe
G. F. Giudice, A. Riotto, I. Tkachev
Many models of supersymmetry breaking, in the context of either supergravity or superstring theories, predict the presence of particles with weak scale masses and Planck-suppressed…
Production of Massive Fermions at Preheating and Leptogenesis
G. F. Giudice, M. Peloso, A. Riotto +1
We present a complete computation of the inflaton decay into very massive fermions during preheating. We show that heavy fermions are produced very efficiently up to masses of orde…