3 papers
astro-ph.CO2025
Production of Gravitational Waves from Preheating and Tachyonic Instabilities
Khursid Alam, Koushik Dutta, Ahamadullah Khan
We analyze GW production during preheating for an -attractor potential terminating in the positive-curvature regime, with energy transfer via . Linear Floquet analysis a…
astro-ph.CO2024
CMB Constraints on Natural Inflation with Gauge Field Production
Khursid Alam, Koushik Dutta, Nur Jaman
The natural inflation model with a periodic cosine potential is ruled out by recent Planck 2018 data for the decay constant . If the Planck data is combi…
astro-ph.CO2023
Non-thermal moduli production during preheating in -attractor inflation models
Khursid Alam, Mar Bastero-Gil, Koushik Dutta +1
Production of gravitationally coupled light moduli fields must be suppressed in the early universe, so that its decay products do not alter Big Bang Nucleosynthesis (BBN) predictio…