Phantom inflation and the "Big Trip"

Abstract

Primordial inflation is regarded to be driven by a phantom field which is here implemented as a scalar field satisfying an equation of state $p=ωρ$, with $ω<-1$. Being even aggravated by the weird properties of phantom energy, this will pose a serious problem with the exit from the inflationary phase. We argue however in favor of the speculation that a smooth exit from the phantom inflationary phase can still be tentatively recovered by considering a multiverse scenario where the primordial phantom universe would travel in time toward a future universe filled with usual radiation, before reaching the big rip. We call this transition the &#34;big trip&#34; and assume it to take place with the help of some form of anthropic principle which chooses our current universe as being the final destination of the time transition.