Conformal Covariance and Positivity of Energy in Charged Sectors

It has been recently noted that diffeomorphism covariance of a Chiral Conformal QFT in the vacuum sector automatically ensures Möbius covariance in all charged sectors. In this article it is shown that diffeomorphism covariance and positivity of the energy in the vacuum sector even ensure the positivity of energy in the charged sectors.The main observation of this paper is that the positivity of energy — at least in case of a Chiral Conformal QFT — is a local concept: it is related to the fact that the energy density, when smeared with some local nonnegative test functions, remains bounded from below (with the bound depending on the test function).The presented proof relies in an essential way on recently developed methods concerning the smearing of the stress-energy tensor with nonsmooth functions.