Theory HEP Seminar

Price for a NEC-violation

Alex Vikman

CERN

In this talk I will discuss theories which violate the Null Energy Condition (NEC). In particular I will show that the NEC-violation is only possible for systems with the Hamiltonian unbounded from below, provided these systems are Lorentz symmetric. I will also discuss the relation of NEC-violation with superluminality and consequences of this relation for alternative theories of the early universe.