Results 31 to 40 of about 2,711,229 (177)
Anomalies and the Green-Schwarz Mechanism [PDF]
, 2022 Anomalies are a very powerful tool in constraining theories beyond the standard model. We give a pedagogical overview of some topics illustrating the important role played by spacetime anomalies in string theory. After discussing the general problem of anomaly cancellation in quantum field theory, the focus is set on the cancellation of anomalies in ...
arxiv +1 more source
A Modern Point of View on Anomalies [PDF]
, 2019 We review the concept of anomaly field theory, namely the fact that the anomalies of a $d$-dimensional field theory can be encoded in a $d+1$-dimensional field theory functor. We give numerous examples of anomaly field theories, explain how classical facts about anomalies are recovered from the anomaly field theory, and review recent work on global ...
arxiv +1 more source
Scale anomalies, states, and rates in conformal field theory
Journal of High Energy Physics, 2017 This paper presents two methods to compute scale anomaly coefficients in conformal field theories (CFTs), such as the c anomaly in four dimensions, in terms of the CFT data.
Marc Gillioz +2 more
doaj +1 more source
Anomalies for Galilean fields [PDF]
SciPost Phys. 5, 005 (2018), 2014 We initiate a systematic study of `t Hooft anomalies in Galilean field theories, focusing on two questions therein. In the first, we consider the non-relativistic theories obtained from a discrete light-cone quantization (DLCQ) of a relativistic theory with flavor or gravitational anomalies. We find that these anomalies survive the DLCQ, becoming mixed
arxiv +1 more source
Weyl fermions in a non-abelian gauge background and trace anomalies
Journal of High Energy Physics, 2019 We study the trace and chiral anomalies of Weyl fermions in a non-abelian gauge background in four dimensions. Using a Pauli-Villars regularization we identify the trace anomaly, proving that it can be cast in a gauge invariant form, even in the presence
Fiorenza Bastianelli, Matteo Broccoli
doaj +1 more source
Anomaly cancellation in effective supergravity theories from the heterotic string: two simple examples [PDF]
, 2017 We use Pauli-Villars regularization to evaluate the conformal and chiral anomalies in the effective field theories from Z3 and Z7 compactifications of the heterotic string without Wilson lines. We show that parameters for Pauli-Villars chiral multiplets can be chosen in such a way that the anomaly is universal in the sense that its coefficient depends ...
arxiv +1 more source
Heterotic global anomalies and torsion Witten index [PDF]
arXiv, 2022 We study the structure of anomalies in general heterotic string theories by considering general 2-dimensional $\mathcal{N}=(0,1)$ supersymmetric quantum field theories (SQFTs), without assuming conformal invariance nor the correct central charges. First we generalize the precise notion of the $B$-field introduced by Witten.
arxiv
T-duality and the weakly coupled heterotic string [PDF]
AIP Conf.Proc.1200:215-225,2010, 2009 T-duality is a symmetry of the heterotic string to all orders in string perturbation theory. This results in an effective four dimensional supergravity theory with desirable features for phenomenology. T-duality, as well as, generically, an anomalous U(1), is broken by quantum anomalies of the effective field theory.
arxiv +1 more source
The UV fate of anomalous U(1)s and the Swampland
Journal of High Energy Physics, 2020 Massive U(1) gauge theories featuring parametrically light vectors are suspected to belong in the Swampland of consistent EFTs that cannot be embedded into a theory of quantum gravity.
Nathaniel Craig +2 more
doaj +1 more source
Discrete R Symmetries and Anomalies [PDF]
JHEP 01 (2014) 011, 2012 We comment on aspects of discrete anomaly conditions focussing particularly on $R$ symmetries. We review the Green-Schwarz cancellation of discrete anomalies, providing a heuristic explanation why, in the heterotic string, only the "model-independent dilaton" transforms non-linearly under discrete symmetries; this argument suggests that, in other ...
arxiv +1 more source