Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- University of GothenburgSE951 papers
- Centre National de la Recherche ScientifiqueFR805 papers
- Leiden UniversityNL590 papers
- Max Planck Institute for Radio AstronomyDE405 papers
- European Southern ObservatoryCL356 papers
- Center for Astrophysics Harvard & SmithsonianUS313 papers
- Leiden Observatory304 papers
- California Institute of TechnologyUS296 papers
- National Astronomical Observatory of JapanJP280 papers
- Observatoire de ParisFR268 papers
- Stockholm UniversitySE262 papers
- Centro de AstrobiologíaES252 papers
21 papers · 1 filter
Real-Time Thermal Propagators and the QED Effective Action for an External Magnetic Field
P. Elmfors, D. Persson, B. -S. Skagerstam
The thermal averaged real-time propagator of a Dirac fermion in a static uniform magnetic field is derived. At non-zero chemical potential and temperature we find explicitly th…
Representations of the -algebra and the loop representation in -dimensions
J. Hallin
We consider the phase-space of Yang-Mills on a cylindrical space-time () and the associated algebra of gauge-invariant functions, the -variables. We solve th…
A Note on the Relation between Different Forms of Superparticle Dynamics'
Martin Cederwall
A formulation of $D\is 10$ superparticle dynamics is given that contain space-time and twistor variables. The set of constraints is entirely first class, and gauge conditions may b…
Frustrated Honeycomb Heisenberg Antiferromagnet: A Schwinger Boson Approach
Ann Mattsson, Per Fröjdh, Torbjörn Einarsson
We analyze the frustrated Heisenberg antiferromagnet defined on a honeycomb lattice using a Schwinger-boson mean-field theory. The spin-wave velocity and the susceptibility are pre…
Representations of the -Extended Heisenberg Algebra and Relations Between Knizhnik-Zamolodchikov Equations and Quantum Calogero Model
Lars Brink, Mikhail A. Vasiliev
We discuss lowest-weight representations of the -Extended Heisenberg Algebras underlying the -body quantum-mechanical Calogero model. Our construction leads to flat derivat…
The Untruncated Marinari-Parisi Superstring
G. Ferretti
It is shown that the bosonic angular degrees of freedom in the one dimensional Marinari-Parisi superstring can be integrated out exactly in the Hamiltonian formulation without havi…
The Seven-sphere and its Kac-Moody Algebra
Martin Cederwall, Christian R. Preitschopf
We investigate the seven-sphere as a group-like manifold and its extension to a Kac-Moody-like algebra. Covariance properties and tensorial composition of spinors under are d…
A note on path integrals and time evolutions in BRST quantization
Robert Marnelius
Recent formal solutions of BRST quantization on inner product spaces within the operator method are shown to lead to an unexpected interpretation of the conventional path integral…
Proper BRST quantization of relativistic particles
Robert Marnelius
Recently derived general formal solutions of a BRST quantization on inner product spaces of irreducible Lie group gauge theories are applied to trivial models and relativistic part…
The Vacuum Energy Density for Spherical and Cylindrical Universes
E. Elizalde
The vacuum energy density (Casimir energy) corresponding to a massless scalar quantum field living in different universes (mainly no-boundary ones), in several dimensions, is calcu…
Gauge fixing and abelianization in simple BRST quantization
Robert Marnelius
In a previous paper \cite{Simple} it was shown that the BRST charge for any gauge model with a Lie algebra symmetry may be decomposed as $Q=\del+\del^†,\;\;\;\del^2=\del^{†2}=0…
strings, parafermions and the Ising model
M. Freeman, P. West
We show that any covariant scattering amplitude of the string will contain, as part of its integrand, a factor that obeys the differential equations satisfied by an Ising mod…
The BRST formulation of G/H WZNW models
Stephen Hwang, Henric Rhedin
We consider a BRST approach to G/H coset WZNW models, {\it i.e.} a formulation in which the coset is defined by a BRST condition. We will give the precise ingrediences needed for t…
Charged Boson Stars and Vacuum Instabilities
P. Jetzer, P. Liljenberg, B. -S. Skagerstam
We consider charged boson stars and study their effect on the structure of the vacuum. For very compact particle like ``stars", with constituent mass close to the Planck ma…
QED effective action at finite temperature and density
Per Elmfors, Bo-Sture Skagerstam, David Persson
The QED effective action at finite temperature and density is calculated to all orders in an external homogeneous and time-independent magnetic field in the weak coupling limit. Th…
Gluing of Branched Surfaces by Sewing of Fermionic String Vertices
Bengt E. W. Nilsson, Per Sundell
We glue together two branched spheres by sewing of two Ramond (dual) two-fermion string vertices and present a rigorous analytic derivation of the closed expression for the four-fe…
On Functional Determinants of Laplacians in Polygons and Simplices
Erik Aurell, Per Salomonson
The functional determinant of an elliptic operator with positive, discrete spectrum may be defined as , where , the zeta function, is the sum $\sum_n^{\infty} λ_n…
Superconformal Algebra and the Superstring
Lars Brink, Martin Cederwall, Christian R. Preitschopf
The superstring in and 6 is invariant under an superconformal algebra based on . There is a direct relationship between this (world-s…
Scaling Properties of the Two-Chain Model
A. A. Nersesyan, A. Luther, F. V. Kusmartsev
Scaling properties of a self-dual field-theoretical model, describing two weakl$spinless Luttinger chains, are studied. A crossover to a sine-Gordon massive phase, with strongly de…
A Four-Reggeon Vertex for Twisted Fermionic Fields
Niclas Engberg, Bengt E. W. Nilsson
Using operator sewing techniques we construct the Reggeon vertex involving four external -twisted complex fermionic fields. Generalizing a procedure recently applied to…
An Algorithm for Computing Four-Ramond Vertices at Arbitrary Level
Niclas Engberg, Bengt E. W Nilsson, Per Sundell
We perform the sewing of two (dual) Ramond reggeon vertices and derive an algorithm by means of which the so obtained four-Ramond reggeon vertex may be explicitly computed at arbit…