3 papers
hep-ph2026
String Axiverse Enhancement of Superradiant Dark Matter Production
Diogo S. Gorgulho, Jacob A. Litterer, João G. Rosa
We study the effects of string axion emission on dark matter production by light primordial black holes (PBHs), through both evaporation and superradiance. We show, in particular,…
hep-th2026
Tachyonic Encore: A universal shift of inflationary observables
Diogo S. Gorgulho, Margherita Putti, Rodrigo Gonzalez Quaglia +3
We propose a generic, largely inflaton-potential-independent mechanism in which a light axion spectator, initialized near the hilltop of its potential, reshapes inflationary observ…
hep-ph2025
Preheated inflation
Diogo S. Gorgulho, João G. Rosa
We propose a new mechanism of non-thermal particle production during inflation based on a narrow parametric resonance, akin to the dynamics of post-inflationary preheating. The mec…