A bstract We present the low-energy effective theory on long strings in quantum field theory,
including a streamlined review of previous literature on the subject. Such long strings can …

The definition of the locally covariant Dirac field is adapted such that it may be charged
under a gauge group and in the presence of generic gauge and Yukawa background fields …

We construct perturbative quantum gravity in a generally covariant way. In particular our
construction is background independent. It is based on the locally covariant approach to …

We demonstrate that perturbative algebraic QFT methods, as developed by Fredenhagen
and Rejzner, naturally yields a factorization algebras of observables for a large class of …

Abstract We study the Sine-Gordon model with Minkowski signature in the framework of
perturbative algebraic quantum field theory. We calculate the vertex operator algebra …

The perturbative approach to nonlinear Sigma models and the associated renormalization
group flow are discussed within the framework of Euclidean algebraic quantum field theory …

A bstract It is argued that the complete S-matrix of string theory at tree level in a flat
background can be obtained from a small set of target space properties, without recourse to …

We consider the QCD string as an effective string, whose action describes long-range
stringy fluctuations. The leading infrared contribution to the ground state energy is given by …

Recent insights into the conceptual structure of localization in QFT (modular localization) led
to clarifications of old unsolved problems. The oldest one is the Einstein–Jordan conundrum …

We implement a proper-time UV regularization of the Nambu-Goto string, introducing an
independent metric tensor and the corresponding Lagrange multiplier, and treating them in …