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Quantum Instability of the Cauchy Horizon in Reissner-Nordstr\"om-deSitter Spacetime.
In classical General Relativity, the values of fields on spacetime are uniquely determined by their values at an initial time within the domain of dependence of this initial data surface. However, itExpand
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Self-intersecting fuzzy extra dimensions from squashed coadjoint orbits in N=4$$ \mathcal{N}=4 $$ SYM and matrix models
A bstractWe find new vacuum solutions of N=4$$ \mathcal{N}=4 $$ super-Yang-Mills with totally antisymmetric cubic soft SUSY breaking terms, or equivalently solutions of the IKKT matrix model of typeExpand
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Divergences in Quantum Field Theory on the Noncommutative Two-Dimensional Minkowski Space with Grosse–Wulkenhaar Potential
  • J. Zahn
  • Mathematics, Physics
  • 4 May 2010
Quantum field theory on the noncommutative two-dimensional Minkowski space with Grosse–Wulkenhaar potential is discussed in two ways: in terms of a continuous set of generalised eigenfunctions of theExpand
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Locally covariant chiral fermions and anomalies
  • J. Zahn
  • Physics, Mathematics
  • 8 July 2014
Abstract We define chiral fermions in the presence of non-trivial gravitational and gauge background fields in the framework of locally covariant field theory. This allows to straightforwardlyExpand
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Generalized Wentzell boundary conditions and holography
We discuss a free scalar field subject to generalized Wentzell boundary conditions. On the classical level, we prove well-posedness of the Cauchy problem and in particular causality. UponExpand
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The wave front set of oscillatory integrals with inhomogeneous phase function
  • J. Zahn
  • Mathematics, Physics
  • 10 January 2011
A generalized notion of oscillatory integrals that allows for inhomogeneous phase functions of arbitrary positive order is introduced. The wave front set of the resulting distributions isExpand
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Locally covariant charged fields and background independence
  • J. Zahn
  • Physics, Mathematics
  • 29 November 2013
We discuss gauge background independence at the example of the charged Dirac field. We show that a perturbative version of background independence, termed perturbative agreement by Hollands and Wald,Expand
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Energy flow in acoustic black holes
We present the results of an analysis of superradiant energy flow due to scalar fields incident on an acoustic black hole. In addition to providing independent confirmation of the recent results inExpand
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Global anomalies on physical space-times
We formulate an algebraic criterion for the presence of global anomalies on globally hyperbolic space-times in the framework of locally covariant field theory. We discuss some consequences and checkExpand
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Remarks on twisted noncommutative quantum field theory
We review recent results on twisted noncommutative quantum field theory by embedding it into a general framework for the quantization of systems with a twisted symmetry. We discuss commutationExpand
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