J. C. Bueno Sánchez

DBI Softens Stiff-Phase Gravitational-Wave Spectra

We investigate the effect of non-canonical kinetic terms on the present-day density spectrum of primordial gravitational waves (GWs), by considering the dynamics of a scalar field governed by the Dirac--Born--Infeld (DBI) action and a runaway potential. The field, responsible for a period of inflation, subsequently ent...