It was recently demonstrated that, when coupled to N = 1 supergravity, the Dirac-Born-Infeld (DBI) action constructed from a single chiral superfield has the property that when the higher-derivative terms become important, the potential becomes negative. Thus, DBI inflation cannot occur in its most interesting, relativistic regime. In this paper, it is shown how to overcome this problem by coup...

It was recently demonstrated that, when coupled to N = 1 supergravity, the Dirac-Born-Infeld (DBI) action constructed from a single chiral superfield has the property that when the higher-derivative terms become important, the potential becomes negative. Thus, DBI inflation cannot occur in its most interesting, relativistic regime. In this paper, it is shown how to overcome this problem by coup...

Abstract We review a technique for solving class of classical linear partial diferential systems relevance to physics in Minkowski spacetime. All the equations are amenable analysis terms complex solutions kernel scalar Laplacian and complexifed Hertz potential. The complexifcation prescription ensures existence regular physical with chirality propagating, non-singular, pulse-like characteristi...