Defect lines, dualities, and generalised orbifolds (2009)
Fröhlich, Jürg, Fuchs, Jürgen, Runkel, Ingo, Schweigert, Christoph
Defects are a useful tool in the study of quantum field theories. This is illustrated in the example of two-dimensional conformal field theories. We describe how defect lines and their junction...
Effective field theories for the $\nu = 5/2$ edge (2009)
Boyarsky, Alexey, Cheianov, Vadim, Fröhlich, Jürg
We present a list of possible effective theories which may describe a QHE edge at filling fraction $\nu =5/2$. We show that there exist several abelian and non-abelian effective theories (apart from...
Studie des Zentrums für Technologiefolgen-Abschätzung (2008)
Lorenz Hilty, Siegfried Behrendt, Mathias Binswanger, Arend Bruinink, Lorenz Erdmann, Jürg Fröhlich, ...
(SWTR) durchgeführt wurden. TA-SWISS hat zum Ziel, die gesellschaftlichen Auswirkungen neuer Technologien möglichst umfassend zu untersuchen. Es geht darum, die allfälligen positiven und negativen...
On the Absence of Excited Eigenstates of Atoms in QED (2008)
Jürg Fröhlich, Alessandro Pizzo
For the standard model of QED with static nuclei, nonrelativistic electrons and an ultraviolet cutoff, a new simple proof of absence of excited eigenstates with energies above the groundstate energy...
Topological investigations on evolutionary optimized non- periodic optical structures (2007)
Michael Spühler, Daniel Erni, Jürg Fröhlich
In an earlier stage of this work two different non-periodic optical waveguide structures, such as a multi-cavity semiconductor laser diode and a non-periodic segmented mode converter have...
Infraparticle Scattering States in Non-Relativistic QED: II. The BlochNordsieck Paradigm (2007)
Thomas Chen, Jürg Fröhlich, Alessandro Pizzo
Abstract. We construct infraparticle scattering states for Compton scattering in the standard model of non-relativistic QED. In our construction, an infrared cutoff initially introduced to regularize...
Infraparticle Scattering States in Non-Relativistic QED: II. The BlochNordsieck Paradigm (2007)
Thomas Chen, Jürg Fröhlich, Alessandro Pizzo
Abstract. We study the infrared problem in the usual model of QED with non-relativistic matter. We prove spectral and regularity properties characterizing the mass shell of an electron and...
Picard groups in rational conformal field theory (2005)
Fröhlich, Jürg, Fuchs, Jürgen, Runkel, Ingo, Schweigert, Christoph
Algebra and representation theory in modular tensor categories can be combined with tools from topological field theory to obtain a deeper understanding of rational conformal field theories in two...
Lorenz Hilty, Siegfried Behrendt, Mathias Binswanger, Arend Bruinink, Lorenz Erdmann, Jürg Fröhlich, ...
Umwelt“).
Asymptotic form of zero-energy wave functions in supersymmetric matrix models (2000)
Fröhlich, Jürg, Hasler, D., Hoppe, Jens
We derive the power law decay, and asymptotic form, of SU(2)×Spin(d) invariant wavefunctions satisfying Qβψ=0 for all sd=2(d−1) supercharges of reduced (d+1)-dimensional supersymmetric SU(2)...
Fundamental strings in Dp-Dq brane systems. (2000)
Fröhlich, Jürg, Grandjean, Olivier, Recknagel, Andreas, Schomerus, Volker
We study conformal field theory correlation functions relevant for string diagrams with open strings that stretch between several parallel branes of different dimensions. In the framework of...
Spectral Analysis for Systems of Atoms and Molecules coupled to the Quantized Radiation Field (1999)
Volker Bach, Jürg Fröhlich, Israel Michael Sigal, Walter Hunziker
We consider systems of static nuclei and electrons -- atoms and molecules -- coupled to the quantized radiation field. The interactions between electrons and the soft modes of the quantized...
TOPOLOGICAL FIELD THEORY (1999)
The Erwin, Schrödinger International Boltzmanngasse, Giovanni Felder, Jürg Fröhlich, Jürgen Fuchs, Christoph Schweigert, ...
We present a general construction of all correlation functions of a two-dimensional rational conformal field theory, for an arbitrary number of bulk and boundary fields and arbitrary topologies. The...
Daniel Erni, Michael Spühler, Jürg Fröhlich
Two different non-periodic optical waveguide structures, such as a multi-cavity semiconductor laser diode and a non-periodic segmented mode converter have been optimized using a generalized...
Spectral Analysis for Systems of Atoms and Molecules coupled to the Quantized Radiation Field (1998)
Volker Bach, Jürg Fröhlich, Israel Michael Sigal
We consider systems of static nuclei and electrons --atoms and molecules-- coupled to the quantized radiation field. The interactions between electrons and the soft modes of the quantized...
Renormalization Group Analysis of Spectral Problems in Quantum Field Theory (1997)
Volker Bach, Jürg Fröhlich, Israel Michael Sigal
In this paper we present a self-contained and detailed exposition of the new renormalization group technique proposed in [1, 2]. Its main feature is that the renormalization group transformation acts...
Positive Commutators and Spectrum of Nonrelativistic QED (1997)
Nonrelativistic Qed, Volker Bach, Jürg Fröhlich, Israel Michael Sigal, Avy Soffer
In this paper we consider the Hamiltonian of the standard model of nonrelativistic QED. In this model non-relativistic quantum particles interact with quantized electro-magnetic field and their...
Representation Theory of Lattice Current Algebras (1996)
Anton Yu. Alekseev, Ludwig D. Faddeev, Jürg Fröhlich, Volker Schomerus
Lattice current algebras were introduced as a regularization of the left- and right moving degrees of freedom in the WZNW model. They provide examples of lattice theories with a local quantum...
Stability Of Ultraviolet-Cutoff Quantum Electrodynamics With Non-Relativistic Matter (1996)
Charles Fefferman, Jürg Fröhlich, Gian Michele Graf
We prove that the quantum-mechanical ground state energy of a system consisting of an arbitrary number, M , of static nuclei of atomic number Z and of an arbitrary number, N , of Pauli electrons...
Low-Temperature Phase Diagrams of Quantum Lattice Systems. III. Examples. (1996)
. We use the low-temperature expansion and the extension of Pirogov-Sinai theory developed in [1], and the perturbation theory of [2] to describe the phase diagrams of two families of fermionic...
Representation Theory of Lattice Current Algebras (1996)
The Erwin, Schrödinger International Boltzmanngasse, Anton Yu. Alekseev, Ludwig D. Faddeev, Jürg Fröhlich, Volker Schomerus, ...
Lattice current algebras were introduced as a regularization of the left- and right moving degrees of freedom in the WZNW model. They provide examples of lattice theories with a local quantum...
Nilanjana Datta, Roberto Fernández, Jürg Fröhlich
Starting from classical lattice systems in d 2 dimensions with a regular zero-temperature phase diagram, involving a finite number of periodic ground states, we prove that the addition of a small...