Brane Bremsstrahlung in DBI Inflation

Understand

We consider the effect of trapped branes on the evolution of a test brane whose motion generates DBI inflation along a warped throat.

• The coupling between the inflationary brane and a trapped brane leads to the radiation of non-thermal particles on the trapped brane.
• We calculate the Gaussian spectrum of the radiated particles and their backreaction on the DBI motion of the inflationary brane.
• Radiation occurs for momenta lower than the speed of the test brane when crossing the trapped brane.