Unnamed: 0 int64 0 18.1k | language stringclasses 4
values | creator stringlengths 2 137 | title stringlengths 2 217 | subject stringclasses 15
values | keyword stringlengths 10 597 | identifier stringlengths 82 244 | description stringlengths 2 2.3k | date stringlengths 14 14 |
|---|---|---|---|---|---|---|---|---|
16,900 | ['eng'] | ['Becchi, C', 'Collina, R', 'Imbimbo, C'] | ['A functional and Lagrangian formulation of two-dimensional topological gravity'] | ['General Theoretical Physics'] | ['gravitation', 'field theory, topological', 'dimension, 2', 'Lagrangian formalism', 'path integral', 'transformation, Becchi-Rouet-Stora'] | ['http://preprints.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=9406096'] | ['We reconsider two-dimensional topological gravity in a functional and lagrangian framework. We derive its Slavnov-Taylor identities and discuss its (in)dependence on the background gauge. Correlators of reparamerization invariant observables are shown to be globally defined forms on moduli space. The potential obstru... | ['1994-06-16'] |
16,901 | ['eng'] | ['Davidson, D R'] | ['Cluster estimates and analytic wavefunctions'] | ['Particle Physics - Theory'] | ['axiomatic field theory', 'wave function', 'expansion, cluster', 'phase space, Hilbert space', 'analytic properties'] | ['http://preprints.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=9406104'] | ['The Tomita-Takesaki modular theory is used to establish a cluster estimate extending and modifying that of Thomas and Wichmann, so as to extend it to regions within which the relevant observables are not necessarily spacelike separated. This sort of estimate is then applied to the case of a massive free field, to sho... | ['1994-06-16'] |
16,902 | ['eng'] | ['Duff, Michael J', 'Rahmfeld, J'] | ['Massive string states as extreme black holes'] | ['Particle Physics - Theory'] | ['string model, heterotic', 'mass spectrum', 'charge, electric', 'black hole', 'field equations, monopole'] | ['http://preprints.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=9406105'] | ['We consider the Schwarz-Sen spectrum of elementary electrically charged massive N_R=1/2 states of the four-dimensional heterotic string and show them to correspond to extreme black hole solutions with scalar-Maxwell parameter a=\\sqrt 3 or 1 according as N_L=1 or N_L>1. The solitonic magnetically charged spectrum con... | ['1994-06-16'] |
16,903 | ['eng'] | ['Okubo, S'] | ['Some new solutions of Yang-Baxter equation'] | ['General Theoretical Physics'] | ['Yang-Baxter equation, solution', 'R-matrix', 'operator, algebra'] | ['http://preprints.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=9406087'] | ['Abstract -- We have found some new solutions of both rational and trigonometric types by rewriting Yang-Baxter equation as a triple product equation in a vector space of matrices.'] | ['1994-06-16'] |
16,904 | ['eng'] | ['Kallosh, R'] | ['Dual waves'] | ['Particle Physics - Theory'] | ['string model', 'supersymmetry', 'dimension, 10', 'effective action', 'dimensional reduction', 'field equations, solution', 'black hole', 'duality, transformation'] | ['http://preprints.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=9406093'] | ['We study the gravitational waves in the 10-dimensional target space of the superstring theory. Some of these waves have unbroken supersymmetries. They consist of Brinkmann metric and of a 2-form field. Sigma-model duality is applied to such waves. The corresponding solutions we call dual partners of gravitational wav... | ['1994-06-16'] |
16,905 | ['eng'] | ['Distler, Jacques', 'Kachru, S'] | ['Singlet couplings and (0,2) models'] | ['General Theoretical Physics'] | ['field theory, conformal', 'dimension, 2', 'field theory, orbifold', 'field theory, deformation', 'supersymmetry', 'quantum group', 'differential geometry, Kaehler', 'moduli space', 'R parity', 'renormalization group'] | ['http://preprints.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=9406090'] | ['We use the quantum symmetries present in string compactification on Landau-Ginzburg orbifolds to prove the existence of a large class of exactly marginal (0,2) deformations of (2,2) superconformal theories. Analogous methods apply to the more general (0,2) models introduced in \\DK, lending further credence to the fa... | ['1994-06-16'] |
16,906 | ['eng'] | ['Lavi, Y', 'Oz, Y', 'Sonnenschein, J'] | ['(1,q=-1) model as a topological description of 2d string theory'] | ['Particle Physics - Theory'] | ['string model', 'field theory, conformal', 'gravitation, topological', 'dimension, 2', 'duality', 'symmetry, W(infinity)', 'Ward identity', 'correlation function', 'Riemann surfaces'] | ['http://preprints.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=9406056'] | ['We study the (1,q=-1) model coupled to topological gravity as a candidate to describing 2d string theory at the self-dual radius. We define the model by analytical continuation of q>1 topological recursion relations to q=-1. We show that at genus zero the q=-1 recursion relations yield the W_{1+\\infty} Ward identiti... | ['1994-06-10'] |
16,907 | ['eng'] | ['Ghosh, S'] | ['Spinning particles in 2+1 dimensions'] | ['Particle Physics - Theory'] | ['particle, relativistic', 'dimension, 3', 'spin', 'postulated particle, anyon', 'Hamiltonian formalism', 'Lagrangian formalism'] | ['http://preprints.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=9406089'] | ['Lagrangian and Hamiltonian formulations of a free spinning particle in 2+1-dimensions or {\\it anyon} are established, following closely the analysis of Hanson and Regge. Two viable (and inequivalent) Lagrangians are derived. It is also argued that one of them is more favourable. In the Hamiltonian analysis non-trivi... | ['1994-06-16'] |
16,908 | ['eng'] | ['Elze, H T'] | ['Entropy, quantum decoherence and pointer states in scalar "parton" fields'] | ['Particle Physics - Theory'] | ['field theory, scalar', 'Schroedinger equation', 'wave function', 'phase space', 'density matrix', 'coherence, decoherence', 'entropy'] | ['http://preprints.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=9406085'] | ['Entropy arises in strong interactions by a dynamical separation of "partons" from unobservable "environment" modes due to confinement. For interacting scalar fields we calculate the statistical entropy of the observable subsystem. Diagonalizing its functional density matrix yields field pointer states and their proba... | ['1994-06-16'] |
16,909 | ['eng'] | ['Borstnik, N M'] | ['Quantum mechanics in grassmann space, supersymmetry and gravity'] | ['Particle Physics - Theory'] | ['quantum mechanics', 'space-time, Grassmann', 'supersymmetry', 'gravitation', 'electromagnetic field', 'dimension, 5', 'spinor', 'algebra, Poincare'] | ['http://preprints.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=9406083'] | ["A particle which lives in a d-dimensional ordinary and a d-dimensional Grassmann space manifests itself in an ordinary four-dimensional subspace as a spinor, a scalar or a vector with charges. Operators of the Lorentz transformations and translations in both spaces form the super- Poincar\\' e algebra. It is the supe... | ['1994-06-16'] |
16,910 | ['eng'] | ['Kiritsis, Elias B', 'Obers, N A'] | ['A new duality symmetry in string theory'] | ['General Theoretical Physics'] | ['string model', 'field theory, conformal', 'dimension, 2', 'gauge field theory', 'duality, transformation'] | ['http://preprints.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=9406082'] | ['We consider the conformal gauging of non-abelian groups. In such cases there are inequivalent ways of gauging (generalizing the axial and vector cases for abelian groups) corresponding to external automorphisms of the group. Different \\s-models obtained this way correspond to the same conformal field theory. We use ... | ['1994-06-16'] |
16,911 | ['eng'] | ['Oehme, Reinhard', 'Xu, W'] | ['Asymptotic limits and sum rules for gauge field propagators'] | ['Particle Physics - Theory'] | ['gauge field theory, Yang-Mills', 'propagator', 'dependence, gauge', 'perturbation theory, higher-order', 'asymptotic behavior', 'sum rule', 'analytic properties'] | ['http://preprints.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=9406081'] | ['Abstract: For gauge field propagators, the asymptotic behavior is obtained in all directions of the complex k^2-plane, and for general, linear, covariant gauges. Asymptotically free theories are considered. Except for coefficients, the functional form of the leading asymptotic terms is gauge-independent. Exponents ar... | ['1994-06-16'] |
16,912 | ['eng'] | ['Frasca, M'] | ['The strong perturbation approach for the dirac equation in a gauge field'] | ['Particle Physics - Theory'] | ['gauge field theory, strong coupling', 'strong coupling, gauge field theory', 'perturbation theory', 'Dirac equation', 'approximation, adiabatic'] | ['http://preprints.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=9406075'] | ['We discuss a possible approach to the problem of a gauge theory with a strong coupling constant. It is seen that, instead of plane waves, we have to consider the adiabatic eigenstates of the perturbation at the leading order to get a meaningful perturbation approach.'] | ['1994-06-14'] |
16,913 | ['eng'] | ['Minic, D', 'Nair, V P'] | ['Wave functionals, hamiltonians and renormalization group'] | ['Particle Physics - Theory'] | ['phi**n model, 4', 'Schroedinger equation', 'wave function', 'energy levels', 'renormalization group'] | ['http://preprints.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=9406074'] | ['We analyze the renormalization of wave functionals and energy eigenvalues in field theory. A discussion of the structure of the renormalization group equation for a general Hamiltonian system is also given.'] | ['1994-06-14'] |
16,914 | ['eng'] | ['Johnson, C V', 'Myers, R C'] | ['Taub--nut dyons in heterotic string theory'] | ['Particle Physics - Theory'] | ['string model, heterotic', 'effective action', 'Einstein equation, solution', 'electromagnetic interaction', 'field theory, dilaton', 'duality', 'field theory, dyon', 'symmetry, O(1,1)', 'symmetry, SL(2,R)'] | ['http://preprints.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=9406069'] | ["Starting with the Taub--NUT solution to Einstein's equations, together with a constant dilaton, a dyonic Taub--NUT solution of low energy heterotic string theory with non--trivial dilaton, axion and U(1) gauge fields is constructed by employing O(1,1) transformations. The electromagnetic dual of this solution is cons... | ['1994-06-13'] |
16,915 | ['eng'] | ['Niemi, Antti J', 'Palo, K'] | ['Equivariant morse theory and quantum integrability'] | ['Particle Physics - Theory'] | ['partition function', 'field theory, topological', 'cohomology', 'differential geometry, symplectic', 'differential forms', 'supersymmetry', 'Morse theory', 'integrability'] | ['http://preprints.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=9406068'] | ["We investigate an equivariant generalization of Morse theory for a general class of integrable models. In particular, we derive equivariant versions of the classical Poincar\\'e-Hopf and Gauss-Bonnet-Chern theorems and present the corresponding path integral generalizations. Our approach is based on equivariant cohom... | ['1994-06-13'] |
16,916 | ['eng'] | ['Kim, B', 'Rocek, Martin'] | ['Complex structures, duality and wzw-models in extended superspace'] | ['Particle Physics - Theory'] | ['Wess-Zumino-Witten model', 'duality', 'supersymmetry, superspace', 'sigma model, nonlinear', 'integrability', 'torsion', 'symmetry, SU(2) x SU(2)', 'symmetry, SU(2) x U(1)'] | ['http://preprints.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=9406063'] | ['We find the complex structure on the dual of a complex target space. We then analyze the particular case of SU(2)\\times SU(2), and are led to a new N=2 superspace formulation of the SU(2)\\times U(1) WZW-model. We also find that for generic N=2 WZW-models, the kernel of the commutator of the left and right complex s... | ['1994-06-13'] |
16,917 | ['fre'] | ['Gieres, François'] | ['Supersymétrie et mathématiques'] | ['General Theoretical Physics'] | ['talk', 'supersymmetry, algebra', 'quantum mechanics', 'Morse theory', 'differential geometry', 'bibliography'] | ['http://preprints.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=9405101'] | ["Nous presentons une introduction aux concepts de la supersymetrie par l'intermediaire de trois exemples: (i) Mecanique quantique supersymetrique, (ii) Superalgebres de Lie, (iii) Superconnexions de Quillen. Les points communs a toutes ces notions sont soulignes et des applications sont indiquees. En particulier nous ... | ['1994-05-17'] |
16,918 | ['eng'] | ['Robson, M A'] | ['Geometric quantization on homogeneous spaces and the meaning of "inequivalent" quantizations'] | ['Particle Physics - Theory'] | ['gauge field theory, Yang-Mills', 'particle, relativistic', 'quantization, geometrical', 'differential geometry, symplectic', 'coset space, phase space', 'fibre bundle'] | ['http://preprints.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=9406057'] | ["Consideration of the geometric quantization of the phase space of a particle in an external Yang-Mills field allows the results of the Mackey-Isham quantization procedure for homogeneous configuration spaces to be reinterpreted. In particular, a clear physical interpretation of the `inequivalent' quantizations occurr... | ['1994-06-10'] |
16,919 | ['eng'] | ['Hosono, S', 'Klemm, A D', 'Theisen, Stefan J', 'Yau, S T'] | ['Mirror symmetry, mirror map and applications to complete intersection Calabi-Yau spaces'] | ['General Theoretical Physics'] | ['string model, heterotic', 'field theory, Calabi-Yau', 'fermion, mirror particle', 'field theory, instanton', 'coupling, Yukawa', 'Yukawa, coupling', 'geometry, algebra', 'bibliography'] | ['http://preprints.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=9406055'] | ['We extend the discussion of mirror symmetry, Picard-Fuchs equations, instanton corrected Yukawa couplings and the topological one loop partition function to the case of complete intersections with higher dimensional moduli spaces. We will develop a new method of obtaining the instanton corrected Yukawa couplings thro... | ['1994-06-10'] |
16,920 | ['eng'] | ['Popowicz, Z'] | ['The extended supersymmetrization of the nonlinear schrodinger equation'] | ['Particle Physics - Theory'] | ['supersymmetry, superfield', 'Schroedinger equation, nonlinear', 'operator, Lax', 'conservation law', 'Hamiltonian formalism'] | ['http://preprints.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=9406054'] | ['Abstract We present the new extended supersymmetrization of the Nonlinear Schrodinger Equation by introducing two superbosons fields with the different gradation. Our model is different from this considered by Toppan and in the reduced case (nonextended supersymmetry) is also different from this considered by Kulish ... | ['1994-06-10'] |
16,921 | ['eng'] | ['Cadoni, M'] | ['Cosmological and wormhole solutions in low-energy effective string theory'] | ['Particle Physics - Theory'] | ['string model', 'effective action', 'field equations, solution', 'wormhole', 'duality', 'moduli space'] | ['http://preprints.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=9406053'] | ['We derive and study a class of cosmological and wormhole solutions of low-energy effective string field theory. We consider a general four-dimensional string effective action where moduli of the compactified manifold and the electromagnetic field are present. The cosmological solutions of the two-dimensional effectiv... | ['1994-06-10'] |
16,922 | ['eng'] | ['Barbón, J L F'] | ['Effective hamiltonians for 1/N expansion in two-dimensional QCD'] | ['Particle Physics - Theory'] | ['gauge field theory, SU(N)', 'quantum chromodynamics', 'fermion', 'dimension, 2', 'quantization', 'Hamiltonian formalism', 'light cone gauge', 'bound state', 'effective Hamiltonian', 'form factor', 'expansion 1/N'] | ['http://preprints.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=9406046'] | ["We discuss the general structure of effective hamiltonians for systematic 1/N expansion in QCD using the light-cone quantization. These are second-quantized hamiltonians acting on the Fock space of mesons and glueballs defined by the solution of the N=\\infty problem. In the two-dimensional case we find only cubic an... | ['1996-06-24'] |
16,923 | ['eng'] | ['Fairlie, David B', 'Nuyts, J'] | ['On certain quantum deformations of gl(N,R)'] | ['Particle Physics - Theory'] | ['group theory, GL(N,R)', 'group theory, representation', 'group theory, deformation', 'quantum group', 'quantum algebra'] | ['http://preprints.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=9406044'] | ['In this paper all deformations of the general linear group, subject to certain restrictions which in particular ensure a smooth passage to the Lie group limit, are obtained. Representations are given in terms of certains sets of creation and annihilation operators. These creation and annihilation operators may belong... | ['1996-06-24'] |
16,924 | ['eng'] | ['Bender, C M', 'Milton, K A'] | ['Casimir effect for a D-dimensional sphere'] | ['Particle Physics - Theory'] | ['field theory, scalar', 'space-time, sphere', 'any-dimensional', 'effect, Casimir', 'propagator', 'analytic properties', 'numerical calculations'] | ['http://preprints.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=9406048'] | ["The Casimir force on a D-dimensional sphere due to the confinement of a massless scalar field is computed as a function of D, where D is a continuous variable that ranges from -\\infty to \\infty. The dependence of the force on the dimension is obtained using a simple and straightforward Green's function technique. W... | ['1996-06-24'] |
16,925 | ['eng'] | ['Robson, M A'] | ['Geometric quantization of the phase space of a particle in a Yang-Mills field'] | ['Particle Physics - Theory'] | ['particle, relativistic', 'gauge field theory, Yang-Mills', 'gauge field theory, external field', 'quantization, geometrical', 'Aharonov-Bohm effect', 'differential geometry, symplectic', 'algebra, Lie', 'coset space'] | ['http://preprints.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=9406041'] | ['The method of geometric quantization is applied to a particle moving on an arbitrary Riemannian manifold Q in an external gauge field, that is a connection on a principal H-bundle N over Q. The phase space of the particle is a Marsden-Weinstein reduction of T^*N, hence this space can also be considered to be the redu... | ['1994-06-09'] |
16,926 | ['eng'] | ['Avramidi, I G'] | ['A new algebraic approach for calculating the heat kernel in quantum gravity'] | ['Particle Physics - Theory'] | ['quantum gravity', 'effective action', 'regularization, heat kernel', 'coset space', 'differential geometry', 'analytic properties', 'bibliography'] | ['http://preprints.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=9406047'] | ['It is shown that the heat kernel operator for the Laplace operator on any covariantly constant curved background, i.e. in symmetric spaces, may be presented in form of an averaging over the Lie group of isometries with some nontrivial measure. Using this representation the heat kernel diagonal, i.e. the heat kernel i... | ['1996-06-24'] |
16,927 | ['eng'] | ['Giacconi, P', 'Ouvry, S', 'Soldati, R'] | ['Axial anomaly in the presence of the aharonov-bohm gauge field'] | ['Particle Physics - Theory'] | ['dimension, 2', 'fermion, Dirac', 'gauge field theory, U(1)', 'anomaly, axial', 'Aharonov-Bohm effect', 'effective action', 'regularization, zeta function'] | ['http://preprints.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=9406039'] | ['We investigate on the plane the axial anomaly for euclidean Dirac fermions in the presence of a background Aharonov--Bohm gauge potential. The non perturbative analysis depends on the self--adjoint extensions of the Dirac operator and the result is shown to be influenced by the actual way of understanding the local a... | ['1994-06-09'] |
16,928 | ['eng'] | ['Kao, H C', 'Lee, K'] | ['Self-dual SU(3) Chern-Simons Higgs systems'] | ['Particle Physics - Theory'] | ['gauge field theory, SU(3)', 'Chern-Simons term', 'dimension, 3', 'Higgs model', 'symmetry, U(1)', 'vacuum state', 'duality', 'symmetry, spontaneously broken', 'particle, spectra', 'spectra, particle'] | ['http://preprints.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=9406049'] | ['We explore self-dual Chern-Simons Higgs systems with the local SU(3) and global U(1) symmetries where the matter field lies in the adjoint representation. We show that there are three degenerate vacua of different symmetries and study the unbroken symmetry and particle spectrum in each vacuum. We classify the self-du... | ['1996-06-24'] |
16,929 | ['eng'] | ['Chen, W'] | ['Topological invariance at finite temperature'] | ['Particle Physics - Theory'] | ['field theory, vector', 'gauge field theory, U(1)', 'Chern-Simons term', 'dimension, 3', 'finite temperature', 'symmetry breaking', 'critical phenomena', 'partition function, measure', 'topology, effect'] | ['http://preprints.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=9406038'] | ['We examine the thermal behavior of a theory with charged massive vector matter coupled to Chern-Simons gauge field. We obtain a critical temperature Tc, at which the effective mass of vector field vanishes, and the system transfers from a symmetry broken phase to topological phase. The phase transition is suggested t... | ['1994-06-09'] |
16,930 | ['eng'] | ['Fumita, N'] | ['Quantum vacuum and anomalies'] | ['General Theoretical Physics'] | ['gauge field theory, U(1)', 'fermion, Dirac', 'dimension, 1', 'dimension, 2', 'anomaly, chiral', 'field theory, conformal', 'anomaly, conformal', 'ghost'] | ['http://preprints.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=9406037'] | ['Chiral, conformal and ghost number anomalies are discussed from the viewpoint of the quantum vacuum in Hamiltonian formalism. After introducing the energy cut-off, we derive known anomalies in a new way. We show that the physical origin of the anomalies is the zero point fluctuation of bosonic or fermionic field. We ... | ['1994-06-09'] |
16,931 | ['eng'] | ['Sonoda, H'] | ['Geometrical expression for short-distance singularities in field theory'] | ['Particle Physics - Theory'] | ['talk, Bombay 1994/01/05', 'field theory, composite', 'fibre bundle', 'renormalization group', 'operator product expansion', 'regularization, dimensional', 'phi**n model, 4'] | ['http://preprints.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=9406035'] | ['We consider the linear space of composite fields as an infinite dimensional vector bundle over the theory space whose coordinates are simply the parameters of a renormalized field theory. We discuss a geometrical expression for the short distance singularities of the composite fields in terms of beta functions, anoma... | ['1994-06-09'] |
16,932 | ['eng'] | ['Bonneau, G'] | ['BRS renormalisation of some on-shell closed algebras of symmetry transformations'] | ['General Theoretical Physics'] | ['sigma model, nonlinear', 'supersymmetry, superfield', 'dimension, 2', 'transformation, Becchi-Rouet-Stora', 'cohomology', 'renormalization', 'ghost', 'anomaly'] | ['http://preprints.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=9406031'] | ['We analyse with the algebraic, regularisation independant, cohomological B.R.S. methods, the renormalisability of torsionless N=2 and N= 4 supersymmetric non-linear \\si models built on K\\"ahler spaces. Surprisingly enough with respect to the common wisdom, in the case of N=2 supersymmetry, we obtain an anomaly cand... | ['1994-06-07'] |
16,933 | ['eng'] | ['Diamandis, G A', 'Georgalas, B C', 'Papantonopoulos, E'] | ['Tachyon effects on the 2-dim black hole geometry'] | ['General Theoretical Physics'] | ['string model', 'dimension, 2', 'gravitation', 'field theory, dilaton', 'field equations, tachyon', 'black hole'] | ['http://preprints.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=9406028'] | ['We study solutions of the tree level string effective action in the presence of the tachyon mode.We find that the 2-dim. static black hole is stable against tachyonic perturbations.For a particular ansatz for the tachyon field we find an exact solution of the equations of motion which exhibits a naked singularity.In ... | ['1994-06-07'] |
16,934 | ['eng'] | ['Crane, L', 'Frenkel, I B'] | ['Four dimensional topological field theories, hopf categories, and the canonical bases'] | ['Particle Physics - Theory'] | ['field theory, topological', 'dimension, 4', 'dimension, 3', 'algebra, Hopf', 'quantum group, SL(2)'] | ['http://preprints.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=9405183'] | ["abstract: We propose a new construction of 4D TQFT, using a new class of algebraic structure, called a Hopf category. We also indicate how to construct a family of examples, using methods related to Lusztig's construction of the canonical bases."] | ['1994-05-30'] |
16,935 | ['eng'] | ['Chamseddine, A H', 'Fröhlich, J'] | ['The Chern-Simons action in non-commutative geometry'] | ['General Theoretical Physics'] | ['gauge field theory, Yang-Mills', 'Chern-Simons term', 'dimension, >=3', 'space-time', 'differential geometry, noncommutative', 'gravitation', 'supergravity'] | ['http://preprints.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=9406013'] | ["Abstract A general definition of Chern-Simons actions in non-commutative geometry is proposed and illustrated in several examples. These are based on ``space-times'' which are products of even-dimensional, Riemannian spin manifolds by a discrete (two-point) set. If the *algebras of operators describing the non-commut... | ['1994-06-06'] |
16,936 | ['eng'] | ['Kachkachi, H'] | ['N=1, 2d-induced Polyakov supergravity on a super Riemann surface'] | ['Particle Physics - Theory'] | ['thesis', 'supergravity, induced', 'Riemann surfaces', 'dimension, 2', 'effective action', 'gauge, chiral', 'topology', 'tensor, energy-momentum', 'differential forms', 'transformation, conformal', 'transformation, Becchi-Rouet-Stora', 'field theory, torus', 'operator product expansion', 'bibliography'] | ['http://preprints.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=9406014'] | ['An effective action describing N=1, 2d-induced supergravity in the chiral gauge is obtained on a compact super Riemann surface without boundary of arbitrary genus'] | ['1994-06-06'] |
16,937 | ['eng'] | ['Chaichian, Masud', 'Felipe, R G', 'Pérez-Rojas, Hugo Celso'] | ['Conserved quantities and electroweak phase transition'] | ['Particle Physics - Theory'] | ['electroweak interaction, density matrix', 'density matrix, electroweak interaction', 'symmetry, spontaneously broken', 'charge, electric', 'W, condensation', 'critical phenomena', 'astrophysics', 'baryon, asymmetry', 'conservation law, B-L number'] | ['http://preprints.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=9405170'] | ['Some cosmological consequences of including the adequate conserved quantities in the density matrix of the electroweak theory are investigated. Several arguments against including the charges associated to the spontaneously broken symmetry are presented. Special attention is focused on the phenomenon of W-boson conde... | ['1994-05-27'] |
16,938 | ['eng'] | ['Kieu, T D'] | ["What's wrong with anomalous chiral gauge theory?"] | ['Particle Physics - Theory'] | ['talk, Taipei 1994/05/16', 'gauge field theory, Yang-Mills', 'fermion, chiral', 'anomaly', 'quantization, 2', 'renormalization', 'Schwinger model'] | ['http://preprints.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=9406026'] | ['It is argued on general ground and demonstrated in the particular example of the Chiral Schwinger Model that there is nothing wrong with apparently anomalous chiral gauge theory. If quantised correctly, there should be no gauge anomaly and chiral gauge theory should be renormalisable and unitary, even in higher dimen... | ['1994-06-06'] |
16,939 | ['eng'] | ['Green, M B', 'Polchinski, Joseph'] | ['Summing over world-sheet boundaries'] | ['Particle Physics - Theory'] | ['string model', 'dimension, 2', 'Riemann surfaces', 'boundary condition', 'moduli space'] | ['http://preprints.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=9406012'] | ['The moduli associated with boundaries in a Riemann surface are parametrized by the positions and strengths of electric charges. This suggests a method for summing over orientable Riemann surfaces with Dirichlet boundary conditions on the embedding coordinates. A light-cone parameterization of such boundaries is also ... | ['1994-06-06'] |
16,940 | ['eng'] | ['Chaichian, Masud', 'Gomes, J F', 'Felipe, R G'] | ['New phenomenon of nonlinear regge trajectory and quantum dual string theory'] | ['Particle Physics - Theory'] | ['string model, deformation', 'dual resonance model', 'particle, mass', 'mass, particle', 'particle, spin', 'spin, particle', 'scattering amplitude', 'linear spaces, Fock space', 'Regge poles, nonlinear', 'quantum group', 'numerical calculations'] | ['http://preprints.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=9405169'] | ['The relation between the spin and the mass of an infinite number of particles in a q-deformed dual string theory is studied. For the deformation parameter q a root of unity, in addition to the relation of such values of q with the rational conformal field theory, the Fock space of each oscillator mode in the Fubini-V... | ['1994-05-27'] |
16,941 | ['eng'] | ['Lee, K', 'Weinberg, Erick J'] | ['Nontopological magnetic monopoles and new magnetically charged black holes'] | ['Particle Physics - Theory'] | ['gauge field theory, U(1)', 'field theory, vector', 'field theory, scalar', 'space-time', 'black hole', 'field equations, monopole'] | ['http://preprints.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=9406021'] | ['The existence of nonsingular classical magnetic monopole solutions is usually understood in terms of topologically nontrivial Higgs field configurations. We show that finite energy magnetic monopole solutions also exist within a class of purely Abelian gauge theories containing charged vector mesons, even though the ... | ['1994-06-06'] |
16,942 | ['eng'] | ['Nanopoulos, Dimitri V'] | ['As time goes by ..'] | ['General Theoretical Physics'] | ['talk, New York 1994/06', 'talk, Beijing 1994/06/15', 'string model', 'space-time', 'astrophysics, wave function', 'quantum mechanics, measurement', 'black hole', 'relativity theory, general', 'history', 'target space', 'bibliography'] | ['http://preprints.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=9406016'] | ['A rather simple and non-technical exposition of our new approach to {\\em Time, Quantum Physics, Black-Hole dynamics}, and {\\em Cosmology}, based on non-critical string theory, is provided. A new fundamental principle, the {\\em Procrustean Principle}, that catches the essence of our approach is postulated: the low-... | ['1994-06-06'] |
16,943 | ['eng'] | ['Kofman, L A', 'Linde, Andrei D', 'Starobinsky, A A'] | ['Reheating after inflation'] | ['General Theoretical Physics'] | ['inflationary universe', 'space-time', 'field theory, scalar', 'fermion'] | ['http://preprints.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=9405187'] | ['The theory of reheating of the Universe after inflation is developed. The transition from inflation to the hot Universe turns out to be strongly model-dependent and typically consists of several stages. Immediately after inflation the field \\phi begins rapidly rolling towards the minimum of its effective potential. ... | ['1994-05-31'] |
16,944 | ['eng'] | ['Ellis, Jonathan Richard', 'Mavromatos, Nikolaos E', 'Nanopoulos, D V'] | ['Some physical aspects of liouville string dynamics'] | ['Particle Physics - Theory'] | ['talk, Rome 1994/03/22', 'string model, Liouville', 'space-time', 'statistical mechanics', 'black hole, string', 'dimension, 2', 'renormalization group', 'violation, CPT', 'angular momentum, violation', 'K0 anti-K0', 'bibliography'] | ['http://preprints.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=9405196'] | ["We discuss some physical aspects of our Liouville approach to non-critical strings, including the emergence of a microscopic arrow of time, effective field theories as classical ``pointer'' states in theory space, CPT violation and the possible apparent non-conservation of angular momentum. We also review the applica... | ['1994-06-02'] |
16,945 | ['eng'] | ['Hoppe, J'] | ['Surface motions and fluid dynamics'] | ['Particle Physics - Theory'] | ['membrane model', 'model, fluid', 'relativistic', 'field equations, solution'] | ['http://preprints.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=9405001'] | ['A certain class of surface motions, including those of a relativistic membrane minimizing the 3-dimensional volume swept out in Minkowski-space, is shown to be equivalent to 3-dimensional steady-state irrotational inviscid isentropic gas-dynamics. The SU(\\infty ) Nahm equations turn out to correspond to motions wher... | ['1994-05-03'] |
16,946 | ['eng'] | ['Guruswamy, S', 'Rajeev, S G', 'Vitale, P'] | ['O(N) sigma model as a three dimensional conformal field theory'] | ['Particle Physics - Theory'] | ['space-time', 'critical phenomena', 'finite temperature', 'sigma model, nonlinear', 'symmetry, O(N)', 'dimension, 3', 'field theory, conformal', 'path integral', 'propagator', 'regularization, zeta function', 'space-time', 'critical phenomena', 'finite temperature', 'expansion 1/N', 'expansion 1/N'] | ['http://preprints.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=9406010'] | ['We study a three dimensional conformal field theory in terms of its partition function on arbitrary curved spaces. The large N limit of the nonlinear sigma model at the non-trivial fixed point is shown to be an example of a conformal field theory, using zeta--function regularization. We compute the critical propertie... | ['1994-06-06'] |
16,947 | ['eng'] | ['Bergshoeff, E A', 'Kallosh, R', 'Ortín, Tomas'] | ['Black-hole-wave duality in string theory'] | ['Particle Physics - Theory'] | ['string model', 'supersymmetry', 'effective action', 'field theory, dilaton', 'sigma model, nonlinear', 'duality, transformation', 'gravitational radiation', 'black hole'] | ['http://preprints.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=9406009'] | ['Extreme 4-dimensional dilaton black holes embedded into 10-dimensional geometry are shown to be dual to the gravitational waves in string theory. The corresponding gravitational waves are the generalization of pp-fronted waves, called supersymmetric string waves. They are given by Brinkmann metric and the two-form fi... | ['1994-06-06'] |
16,948 | ['eng'] | ['Berglund, P', 'Katz, S'] | ['Mirror symmetry constructions'] | ['Particle Physics - Theory'] | ['field theory, conformal', 'dimension, 2', 'supersymmetry, superfield', 'symmetry, mirror', 'fermion, mirror particle', 'field theory, orbifold', 'geometry, algebra'] | ['http://preprints.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=9406008'] | ['We review various constructions of mirror symmetry in terms of Landau-Ginzburg orbifolds for arbitrary central charge c and \\CY\\ hypersurfaces and complete intersections in toric varieties. In particular it is shown how the different techniques are related.'] | ['1994-06-06'] |
16,949 | ['eng'] | ['Marotta, V', 'Sciarrino, A'] | ['Structure of lorentzian algebras and conformal field theory'] | ['Particle Physics - Theory'] | ['field theory, conformal', 'dimension, 2', 'algebra, Lorentz', 'algebra, Virasoro', 'algebra, Kac-Moody', 'operator, vertex', 'algebra, representation'] | ['http://preprints.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=9405192'] | ['The main properties of indefinite Kac-Moody and Borcherds algebras, considered in a unified way as Lorentzian algebras, are reviewed. The connection with the conformal field theory of the vertex operator construction is discussed. By the folding procedure a class of subalgebras is obtained.'] | ['1994-06-02'] |
16,950 | ['eng'] | ['Sundborg, B'] | ['Strongly topological interactions of tensionless strings'] | ['Particle Physics - Theory'] | ['string model', 'string tension, 0', 'path integral', 'invariance, Weyl', 'field theory, topological'] | ['http://preprints.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=9405195'] | ['The tensionless limit of classical string theory may be formulated as a topological theory on the world-sheet. A vector density carries geometrical information in place of an internal metric. It is found that path-integral quantization allows for the definition of several, possibly inequivalent quantum theories. Stri... | ['1994-06-02'] |
16,951 | ['eng'] | ['Solodukhin, S N'] | ['On higher derivative gravity in two dimensions'] | ['Particle Physics - Theory'] | ['quantum gravity', 'dimension, 2', 'field equations, solution', 'integrability', 'renormalization', 'coupling, matter', 'matter, coupling', 'matter, conformal', 'black hole', 'gravitation, dilaton', 'correction, higher-order', 'effect, back reaction'] | ['http://preprints.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=9405132'] | ['The 2D gravity described by the action which is an arbitrary function of the scalar curvature f(R) is considered. The classical vacuum solutions are analyzed. The one-loop renormalizability is studied. For the function f=R \\ln R the model coupled with scalar (conformal) matter is exactly integrated and is shown to d... | ['1994-05-25'] |
16,952 | ['eng'] | ['Dowker, John S'] | ['Heat kernels on curved cones'] | ['Particle Physics - Theory'] | ['space-time', 'regularization, heat kernel'] | ['http://preprints.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=9406002'] | ['A functorial derivation is presented of a heat-kernel expansion coefficient on a manifold with a singular fixed point set of codimension two. The existence of an extrinsic curvature term is pointed out.'] | ['1994-06-02'] |
16,953 | ['eng'] | ['De Rújula, Alvaro'] | ['Effects of virtual monopoles;'] | ['Particle Physics - Theory'] | ['quantum electrodynamics', 'postulated particle, magnetic monopole', 'postulated particle, dyon', 'mass, magnetic monopole', 'magnetic monopole, mass', 'Salam-Weinberg model', 'coupling constant', 'Z0, radiative decay', 'radiative decay, Z0', 'electron positron, annihilation', 'annihilation, electron positron', 'W, pa... | ['http://preprints.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=9405191'] | ["Electromagnetism would be a ``more unified'' theory if there were elementary magnetic monopoles and/or particles with both electric and magnetic charges (dyons). I discuss the simplest possibilities for the addition of these entities onto the Standard Model, and their empirical consequences. Lower limits on the masse... | ['1994-06-02'] |
16,954 | ['eng'] | ['Barnich, G', 'Brandt, F', 'Henneaux, M'] | ['Local BRST cohomology in the antifield formalism; 2, application to Yang-Mills theory'] | ['General Theoretical Physics'] | ['transformation, Becchi-Rouet-Stora', 'differential forms', 'ghost', 'gauge field theory, Yang-Mills', 'field theory, antifield', 'cohomology', 'perturbation theory', 'mathematical methods'] | ['http://preprints.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=9405194'] | ['Yang-Mills models with compact gauge group coupled to matter fields are considered. The general tools developed in a companion paper are applied to compute the local cohomology of the BRST differential s modulo the exterior spacetime derivative d for all values of the ghost number, in the space of polynomials in the ... | ['1994-06-02'] |
16,955 | ['eng'] | ['Morris, T R'] | ['On truncations of the exact renormalization group'] | ['General Theoretical Physics'] | ['field theory, scalar', 'symmetry, Z(2)', 'partition function', 'renormalization group, transformation', 'effective potential', 'numerical calculations'] | ['http://preprints.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=9405190'] | ['We investigate the Exact Renormalization Group (ERG) description of (Z_2 invariant) one-component scalar field theory, in the approximation in which all momentum dependence is discarded in the effective vertices. In this context we show how one can perform a systematic search for non-perturbative continuum limits wit... | ['1994-05-31'] |
16,956 | ['eng'] | ['Ferrara, Sergio', 'Kounnas, Costas', 'Zwirner, F'] | ['Mass formulae and natural hierarchy in string effective supergravities'] | ['Particle Physics - Theory'] | ['supergravity', 'effective potential', 'mass, hierarchy', 'hierarchy, mass', 'mass formula', 'string model', 'supersymmetry', 'symmetry breaking, nonperturbative', 'symmetry, scaling', 'invariance, modular', 'bibliography'] | ['http://preprints.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=9405188'] | ['We study some conditions for the hierarchy m_{3/2} << M_P to occur naturally in a generic effective supergravity theory. Absence of fine-tuning and perturbative calculability require that the effective potential has a sliding gravitino mass and vanishing cosmological constant, up to {\\cal O}(m_{3/2}^4) corrections. ... | ['1994-05-31'] |
16,957 | ['eng'] | ['Teitelboim, C'] | ['Topological roots of black hole entropy'] | ['Particle Physics - Theory'] | ['talk, Rayleigh 1993/12/12', 'black hole, entropy', 'gravitation', 'astrophysics, horizon', 'space-time, singularity', 'path integral', 'Wheeler-DeWitt equation', 'field theory, action', 'partition function'] | ['http://preprints.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=9405199'] | ['We review the insights into black hole entropy that arise from the formulation of gravitation theory in terms of dimensional continuation. The role of the horizon area and the deficit angle of a conical singularity at the horizon as canonically conjugate dynamical variables is analyzed. The path integral and the exte... | ['1994-06-02'] |
16,958 | ['eng'] | ['Anselmi, D', 'Fré, P', 'Girardello, L', 'Soriani, P'] | ['Constrained topological field theory'] | ['Particle Physics - Theory'] | ['gravitation, topological', 'field theory, Liouville', 'dimension, 2', 'transformation, Becchi-Rouet-Stora', 'constraint', 'moduli space', 'charge, topological'] | ['http://preprints.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=9405174'] | ['We derive a model of constrained topological gravity, a theory recently introduced by us through the twist of N=2 Liouville theory, starting from the general BRST algebra and imposing the moduli space constraint as a gauge fixing. To do this, it is necessary to introduce a formalism that allows a careful treatment of... | ['1994-05-30'] |
16,959 | ['eng'] | ['Kalloniatis, A C', 'Robertson, D G'] | ['On the discretized light-cone quantization of electrodynamics'] | ['Particle Physics - Theory'] | ['quantum electrodynamics', 'quantization, light cone', 'Hamiltonian formalism', 'constraint, solution', 'perturbation theory', 'boundary condition'] | ['http://preprints.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=9405176'] | ["Discretized light-cone quantization of (3+1)-dimensional electrodynamics is discussed, with careful attention paid to the interplay between gauge choice and boundary conditions. In the zero longitudinal momentum sector of the theory a general gauge fixing is performed, and the corresponding relations that determine t... | ['1994-05-30'] |
16,960 | ['eng'] | ['Ohta, K', 'Suzuki, H'] | ['Dirac operators on quantum two-spheres'] | ['General Theoretical Physics'] | ['space-time, sphere', 'quantum space', 'quantum algebra, SU(2)', 'operator, Dirac', 'fermion, wave function', 'partial wave analysis'] | ['http://preprints.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=9405180'] | ['We investigate the spin 1/2 fermions on quantum two spheres. It is shown that the wave functions of fermions and a Dirac Operator on quantum two spheres can be constructed in a manifestly covariant way under the quantum group SU(2)_q. The concept of total angular momentum and chirality can be expressed by using q-ana... | ['1994-05-30'] |
16,961 | ['eng'] | ['Cortés, J L', 'Plyushchay, M S'] | ['Anyons'] | ['Particle Physics - Phenomenology'] | ['gauge field theory, U(1)', 'Chern-Simons term', 'dimension, 3', 'postulated particle, anyon', 'spin, fractional', 'fractional, spin', 'quantization'] | ['http://preprints.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=9405181'] | ['The minimal (reduced) and extended canonical formulations for (2+1)-dimensional fractional spin particles are considered. We investigate the relationship between them, clearing up the meaning of the coordinates for such particles, and analyse the related question of correlation between spin and momentum. The classica... | ['1994-05-30'] |
16,962 | ['eng'] | ['Burgess, M'] | ['Infrared behaviour, sources and the Schwinger action principle'] | ['Particle Physics - Theory'] | ['path integral', 'effective action', 'renormalization group, transformation', 'field equations', 'phi**n model, 4', 'quantum electrodynamics, scalar', 'finite temperature', 'thermodynamics', 'regularization', 'infrared problem'] | ['http://preprints.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=9405184'] | ['An action principle technique is used to explore some issues concerning the infra-red problem in the effective action for gauge field theories. The relationship between the renormalization group and other non-perturbative resummation schemes is demonstrated by means of a source theory. It is shown that the use of ver... | ['1994-05-30'] |
16,963 | ['eng'] | ['Oda, I'] | ['Black hole thermodynamics from string theory'] | ['Particle Physics - Theory'] | ['black hole, horizon', 'sigma model, nonlinear', 'dimension, 2', 'field equations, solution', 'black hole, entropy', 'string model'] | ['http://preprints.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=9405185'] | ["In this note we consider a stringy description of black hole horizon. We start with a nonlinear sigma model defined on a two dimensional Euclidean surface with background Rindler metric. By solving the field equations, we show that to the leading order the Bekenstein-Hawking formula of black hole entropy can be produ... | ['1994-05-30'] |
16,964 | ['eng'] | ['Bonneau, G'] | ['BRS renormalisation of some on-shell closed algebras of symmetry transformations'] | ['Particle Physics - Theory'] | ['sigma model, nonlinear', 'supersymmetry, superfield', 'dimension, 2', 'perturbation theory, higher-order', 'renormalization, Becchi-Rouet-Stora', 'Slavnov identity', 'ghost', 'cohomology'] | ['http://preprints.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=9406030'] | ['In order to study in a regularisation free manner the renormalisability of d=2 supersymmetric non-linear \\si models, one has to use the algebraic BRS methods ; moreover, in the absence of an off-shell formulation, one has often to deal with open algebras. We then recall in a pedagogical and non technical manner the ... | ['1994-06-07'] |
16,965 | ['eng'] | ['Cea, P', 'Tedesco, L'] | ['Generalized Gaussian effective potential'] | ['General Theoretical Physics'] | ['phi**n model, 4', 'effective potential', 'wave function', 'perturbation theory, higher-order', 'higher-order, 2', 'numerical calculations'] | ['http://preprints.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=9405173'] | ['We study a generalization of the Gaussian effective potential for self-interacting scalar fields in one and two spatial dimensions. We compute the two-loop corrections and discuss the renormalization of the generalized Gaussian effective potential.'] | ['1994-05-27'] |
16,966 | ['eng'] | ['Marnelius, R', 'Shvartsman, S M'] | ['Superparticle actions from superfields'] | ['General Theoretical Physics'] | ['particle, relativistic', 'field theory, scalar', 'supersymmetry, superfield', 'quantization, constraint', 'transformation, Becchi-Rouet-Stora', 'gauge field theory, external field', 'dependence, gauge'] | ['http://preprints.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=9405164'] | ['Gauge invariant complex covariant actions for superparticles are derived from the field equations for the chiral superfields in a precise manner. The massive and massless cases in four dimensions are treated both free and in interaction with an external super Maxwell field. By means of a generalized BRST quantization... | ['1994-05-27'] |
16,967 | ['eng'] | ['Fuchs, J', 'Gato-Rivera, B', 'Schellekens, B', 'Schweigert, C'] | ['Modular invariants and fusion rule automorphisms from Galois theory'] | ['General Theoretical Physics'] | ['invariance, modular', 'field theory, conformal', 'group theory, Galois', 'algebra, fusion', 'S-matrix', 'Wess-Zumino-Witten model'] | ['http://preprints.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=9405153'] | ['We show that Galois theory of cyclotomic number fields provides a powerful tool to construct systematically integer-valued matrices commuting with the modular matrix S, as well as automorphisms of the fusion rules. Both of these prescriptions allow the construction of modular invariants and offer new insight in the s... | ['1994-05-26'] |
16,968 | ['eng'] | ['Bars, Itzhak', 'Schulze, J'] | ['Folded strings falling into a black hole'] | ['Particle Physics - Theory'] | ['string model', 'space-time', 'dimension, 2', 'Wess-Zumino-Witten model', 'gauge field theory', 'field equations, solution', 'black hole'] | ['http://preprints.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=9405156'] | [] | ['2003-12-11'] |
16,969 | ['eng'] | ['Dine, Michael', 'Shirman, Yu'] | ['Some explorations in holomorphy'] | ['Particle Physics - Theory'] | ['gauge field theory, E(6)', 'supersymmetry', 'potential', 'coupling constant', 'analytic properties', 'perturbation theory, higher-order', 'renormalization'] | ['http://preprints.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=9405155'] | ['In supersymmetric theories, one can obtain striking results and insights by exploiting the fact that the superpotential and the gauge coupling function are holomorphic functions of the model parameters. The precise meaning of this holomorphy is subtle, and has been explained most clearly by Shifman and Vainshtein, wh... | ['1994-05-26'] |
16,970 | ['eng'] | ['Berkovits, N', 'Ohta, N'] | ['Embeddings for non-critical superstrings'] | ['Particle Physics - Theory'] | ['string model, embedding', 'supersymmetry', 'central charge', 'tensor, energy-momentum', 'operator product expansion'] | ['http://preprints.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=9405144'] | ['It was previously shown that at critical central charge, N-extended superstrings can be embedded in (N+1)-extended superstrings. In other words, (N=0,c=26)\\to (N=1,c=15)\\to (N=2,c=6)\\to (N=3,c=0) \\to (N=4,c=0) . In this paper, we show that similar embeddings are also possible for N-extended superstrings at non-cr... | ['1994-05-25'] |
16,971 | ['eng'] | ['Fursaev, D V'] | ['Spectral geometry and one-loop divergences on manifolds with conical singularities'] | ['Particle Physics - Theory'] | ['space-time', 'boundary condition', 'effective action', 'perturbation theory, higher-order', 'regularization, heat kernel', 'field theory, scalar', 'effect, singularity'] | ['http://preprints.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=9405143'] | ['Geometrical form of the one-loop divergences induced by conical singularities of background manifolds is studied. To this aim the heat kernel asymptotic expansion on spaces having the structure C_{\\alpha}\\times \\Sigma near singular surface \\Sigma is analysed. Surface corrections to standard second and third heat ... | ['1994-05-25'] |
16,972 | ['eng'] | ['Bougourzi, A H', 'Vinet, L'] | ['A quantum analogue of the boson-fermion correspondence'] | ['Particle Physics - Theory'] | ['current algebra', 'quantum algebra, SL(2)', 'algebra, affine', 'algebra, representation', 'operator product expansion', 'bosonization', 'fermionization'] | ['http://preprints.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=9405142'] | ['We review the classical boson-fermion correspondence in the context of the \\widehat{sl(2)} current algebra at level 2. This particular algebra is ideal to exhibit this correspondence because it can be realized either in terms of three real bosonic fields or in terms of one real and one complex fermionic fields. We a... | ['1994-05-25'] |
16,973 | ['eng'] | ['Celeghini, E', 'Rasetti, M', 'Vitiello, G'] | ['Identical particles and permutation group'] | ['Particle Physics - Theory'] | ['quantization, 2', 'spin, statistics', 'statistics, spin', 'operator, algebra', 'linear spaces, Fock space'] | ['http://preprints.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=9405139'] | ['Second quantization is revisited and creation and annihilation operators areshown to be related, on the same footing both to the algebra h(1), and to the superalgebra osp(1|2) that are shown to be both compatible with Bose and Fermi statistics. The two algebras are completely equivalent in the one-mode sector but, be... | ['1994-05-25'] |
16,974 | ['eng'] | ['Celeghini, E', 'Rasetti, M', 'Vitiello, G'] | ['Identical particles and permutation group'] | ['Particle Physics - Theory'] | ['quantization, 2', 'spin, statistics', 'statistics, spin', 'operator, algebra', 'linear spaces, Fock space'] | ['http://preprints.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=9503183'] | ['Second quantization is revisited and creation and annihilation operators are shown to be related, on the same footing both to the algebra {\\it h}(1), {\\underline {and}} to the superalgebra {\\it osp}(1|2) that are shown to be both compatible with Bose {\\underline {and}} Fermi statistics. The two algebras are compl... | ['1995-03-28'] |
16,975 | ['eng'] | ['Grinstein, B'] | ['Exact heavy to light meson form factors in the chiral limit of planar 1+1 QCD'] | ['Particle Physics - Theory'] | ['talk', 'quantum chromodynamics, planar', 'dimension, 2', 'B, decay', 'decay, B', 'decay, form factor', 'form factor, decay', 'current, vector', 'current, flavor changing', 'quark, mass', 'mass, quark', 'model, pole', 'numerical calculations'] | ['http://preprints.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=9405137'] | ["The form factors of the flavor changing vector current between a \\bar q Q-meson and the lightest \\bar q q (pseudoscalar-)meson are computed exactly and explicitly in the 't~Hooft model (planar QCD in 1+1 dimensions) in the limit that the mass of q-quark vanishes."] | ['1994-05-25'] |
16,976 | ['eng'] | ['Steinmann, O'] | ['Perturbative quantum field theory at positive temperatures'] | ['Particle Physics - Theory'] | ['phi**n model, 4', 'correlation function', 'perturbation theory', 'finite temperature', 'field equations', 'axiomatic field theory'] | ['http://preprints.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=9405135'] | ['It is shown that the perturbative expansions of the correlation functions of a relativistic quantum field theory at finite temperature are uniquely determined by the equations of motion and standard axiomatic requirements, including the KMS condition. An explicit expression as a sum over generalized Feynman graphs is... | ['1994-05-25'] |
16,977 | ['eng'] | ['Moritsch, O', 'Schweda, Manfred'] | ['On the algebraic structure of gravity with torsion including weyl symmetry'] | ['Particle Physics - Theory'] | ['gravitation', 'gauge field theory, space-time', 'transformation, Lorentz', 'transformation, diffeomorphism', 'transformation, Weyl', 'torsion', 'transformation, Becchi-Rouet-Stora', 'field theory, scalar', 'path integral', 'anomaly', 'operator, algebra', 'bibliography'] | ['http://preprints.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=9405133'] | ['The BRST transformations for gravity with torsion including Weyl symmetry are discussed by using the so-called Maurer-Cartan horizontality conditions. Also the coupling of scalar matter fields to gravity is incorporated in this analysis. With the help of an operator \\d which allows to decompose the exterior space-ti... | ['1994-05-25'] |
16,978 | ['eng'] | ['Snippe, J'] | ['Tunneling through sphalerons'] | ['General Theoretical Physics'] | ['sigma model, nonlinear', 'symmetry, O(3)', 'space-time, cylinder', 'dimension, 2', 'field equations, instanton', 'moduli space'] | ['http://preprints.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=9405129'] | ['We construct all instantons for the \\nlsig\\ on a cylinder, known not to exist on a finite time interval. We show that the widest instantons go through sphalerons. A re-interpretation of moduli-space transforms the scale parameter \\rho to a boundary condition in time. This may give a handle on the \\rho\\rightarrow... | ['1994-05-25'] |
16,979 | ['eng'] | ['Buffenoir, E', 'Roche, P'] | ['Two dimensional lattice gauge theory based on a quantum group'] | ['Particle Physics - Theory'] | ['gauge field theory, Yang-Mills', 'dimension, 2', 'lattice field theory', 'quantum group', 'Wilson loop', 'Riemann surfaces', 'correlation function', 'partition function', 'symmetry, gauge'] | ['http://preprints.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=9405126'] | ['In this article we analyze a two dimensional lattice gauge theory based on a quantum group. The algebra generated by gauge fields is the lattice algebra introduced recently by A.Yu.Alekseev, H.Grosse and V.Schomerus. We define and study Wilson loops. We show that this theory is quasitopological as in the classical ca... | ['1994-05-25'] |
16,980 | ['eng'] | ['Duff, Michael J', 'Gibbons, G W', 'Townsend, P K'] | ['Macroscopic superstrings as interpolating solitons'] | ['General Theoretical Physics'] | ['string model', 'supersymmetry', 'dimension, 10', 'membrane model, p-brane', 'p-brane, 5', 'dimension, 11', 'field equations, soliton'] | ['http://preprints.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=9405124'] | ["It is known that, in string sigma-model metric, the `extreme' fivebrane solution of D=10 supergravity interpolates between D=10 Minkowski spacetime and a supersymmetric S^3 compactification to a linear dilaton vacuum. We show here that, in {\\it fivebrane} sigma-model metric, the extreme string solution of D=10 super... | ['1994-05-25'] |
16,981 | ['eng'] | ['Mussardo, G'] | ['Spectral representation of correlation functions in two-dimensional quantum field theories'] | ['Particle Physics - Theory'] | ['talk', 'field theory, Euclidean', 'dimension, 2', 'correlation function', 'spectral representation', 'analytic properties', 'Ising model'] | ['http://preprints.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=9405128'] | ['The non-perturbative mapping between different Quantum Field Theories and other features of two-dimensional massive integrable models are discussed by using the Form Factor approach. The computation of ultraviolet data associated to the massive regime is illustrated by taking as an example the scattering theory of th... | ['1994-05-25'] |
16,982 | ['eng'] | ['Russo, Jorge G'] | ['Thermal ensemble of string gas in a magnetic field'] | ['Particle Physics - Theory'] | ['string model', 'gas, string', 'magnetic field', 'partition function', 'critical phenomena', 'temperature, Hagedorn', 'superconducting, model', 'model, superconducting', 'symmetry breaking', 'postulated particle, tachyon'] | ['http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=9405118'] | ['We study the thermal ensemble of a gas of free strings in presence of a magnetic field. We find that the thermodynamical partition function diverges when the magnetic field exceeds some critical value $B_{\\rm cr}$, which depends on the temperature. We argue that there is a first-order phase transition with a large l... | ['2003-07-02'] |
16,983 | ['eng'] | ['Bandos, I A', 'Zheltukhin, A A'] | ['N=1 super-p-branes in twistor-like Lorentz harmonic formulation'] | ['Particle Physics - Theory'] | ['membrane model, p-brane', 'supersymmetry, superspace', 'field theory, action', 'twistor', 'field equations', 'string model, heterotic'] | ['http://preprints.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=9405113'] | [] | ['2003-12-11'] |
16,984 | ['eng'] | ['Alfaro, J', 'Damgaard, P H'] | ['Generalized lagrangian master equations'] | ['Particle Physics - Theory'] | ['quantization, Batalin-Vilkovisky', 'Lagrangian formalism', 'transformation, Becchi-Rouet-Stora', 'Dyson-Schwinger equation', 'master equation', 'Ward identity'] | ['http://preprints.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=9405112'] | ['We discuss the geometry of the Lagrangian quantization scheme based on (generalized) Schwinger-Dyson BRST symmetries. When a certain set of ghost fields are integrated out of the path integral, we recover the Batalin-Vilkovisky formalism, now extended to arbitrary functional measures for the classical fields. Keeping... | ['1994-05-19'] |
16,985 | ['eng'] | ['Cooper, F', 'Khare, A', 'Sukhatme, U P'] | ['Supersymmetry and quantum mechanics'] | ['Particle Physics - Theory'] | ['quantum mechanics', 'supersymmetry', 'symmetry breaking', 'Hamiltonian formalism', 'potential', 'S-matrix', 'integrability', 'bound state', 'approximation, quasiclassical', 'path integral', 'energy levels', 'wave function', 'perturbation theory', 'numerical calculations', 'bibliography'] | ['http://preprints.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=9405029'] | ['In the past ten years, the ideas of supersymmetry have been profitably applied to many nonrelativistic quantum mechanical problems. In particular, there is now a much deeper understanding of why certain potentials are analytically solvable and an array of powerful new approximation methods for handling potentials whi... | ['1994-05-09'] |
16,986 | ['eng'] | ['Brunelli, J C', 'Das, A', 'Huang, W J'] | ['Gelfand-Dikii brackets for nonstandard Lax equations'] | ['General Theoretical Physics'] | ['differential equations, nonlinear', 'operator, Lax', 'algebra, Kac-Moody', 'Hamiltonian formalism', 'integrability'] | ['http://preprints.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=9405111'] | ['Abstract : We generalize the construction of Gelfand-Dikii brackets to the case of nonstandard Lax equations. We also discuss the possible origin of Kac-Moody algebras present in such systems.'] | ['1994-05-19'] |
16,987 | ['eng'] | ['Barnich, G', 'Brandt, F', 'Henneaux, M'] | ['Local BRST cohomology in the antifield formalism; 1, general theorems'] | ['General Theoretical Physics'] | ['cohomology, Becchi-Rouet-Stora', 'differential forms', 'ghost', 'field equations', 'conservation law', 'gauge field theory, Yang-Mills', 'gravitation', 'bibliography'] | ['http://preprints.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=9405109'] | ['We establish general theorems on the cohomology H^*(s|d) of the BRST differential modulo the spacetime exterior derivative, acting in the algebra of local p-forms depending on the fields and the antifields (=sources for the BRST variations). It is shown that H^{-k}(s|d) is isomorphic to H_k(\\delta |d) in negative gh... | ['1994-05-19'] |
16,988 | ['eng'] | ['Birmingham, Daniel', 'Rakowski, M'] | ['State sum models and simplicial cohomology'] | ['Particle Physics - Theory'] | ['lattice field theory', 'gauge field theory, Z(N)', 'partition function', 'space-time, simplex', 'cohomology'] | ['http://preprints.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=9405108'] | ['We continue our analysis of a recently introduced subdivision invariant lattice model in four dimensions with gauge group Z_{p}. This model is based upon the assignment of field variables to both the 1- and 2-dimensional simplices of the simplicial complex. The property of subdivision invariance is achieved when the ... | ['1994-05-19'] |
16,989 | ['eng'] | ['Eguchi, Tohru', 'Yamada, Y', 'Yang, S K'] | ['On the genus expansion in the topological string theory'] | ['General Theoretical Physics'] | ['field theory, topological', 'gravitation', 'dimension, 2', 'string model', 'invariance, Becchi-Rouet-Stora', 'field theoretical model, CP(1)', 'model, vector', 'correlation function', 'perturbation theory, higher-order'] | ['http://preprints.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=9405106'] | ['A systematic formulation of the higher genus expansion in topological string theory is considered. We also develop a simple way of evaluating genus zero correlation functions. At higher genera we derive some interesting formulas for the free energy in the A_1 and A_2 models. We present some evidence that topological ... | ['1994-05-19'] |
16,990 | ['eng'] | ['Susskind, Leonard'] | ['Comment on a proposal by Strominger'] | ['Particle Physics - Theory'] | ['astrophysics', 'quantum gravity', 'black hole', 'radiation, Hawking', 'thermodynamics', 'density matrix'] | ['http://preprints.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=9405103'] | ["Strominger has proposed an interesting concrete realization of Hawking's idea that information is lost in black hole evaporation. In this note we demonstrate that a straightforward interpretation of Strominger's model leads to a complete breakdown of the conditions for using statistics for analyzing the results of ex... | ['1994-05-19'] |
16,991 | ['eng'] | ['Fujikawa, K'] | ['Generalized pauli-villars regularization and the covariant form of anomalies'] | ['Particle Physics - Theory'] | ['gauge field theory, Yang-Mills', 'fermion, chiral', 'current, conservation law', 'propagator', 'path integral', 'perturbation theory, higher-order', 'regularization, Pauli-Villars', 'anomaly', 'invariance, Lorentz'] | ['http://preprints.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=9405166'] | ['In the generalized Pauli-Villars regularization of chiral gauge theory proposed by Frolov and Slavnov , it is essential to specify how to sum the contributions from an infinite number of regulator fields. It is shown that an explicit sum of contributions from an infinite number of fields essentially results in a spec... | ['1994-05-27'] |
16,992 | ['eng'] | ['Albeverio, Sergio A', 'Fei, S'] | ['BRST structures and symplectic geometry on a class of supermanifolds'] | ['Particle Physics - Theory'] | ['Hamiltonian formalism', 'charge, Becchi-Rouet-Stora', 'quantization, geometrical', 'supersymmetry', 'algebra, deformation', 'differential geometry, symplectic'] | ['http://preprints.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=9405097'] | ['Abstract: By investigating the symplectic geometry and geometric quantization on a class of supermanifolds, we exhibit BRST structures for a certain kind of algebras. We discuss the undeformed and q-deformed cases in the classical as well as in the quantum cases.'] | ['1994-05-17'] |
16,993 | ['eng'] | ['Braga, N R F'] | ['BRST quantization of anomalous gauge theories'] | ['Particle Physics - Theory'] | ['gauge field theory', 'path integral', 'quantization, Batalin-Vilkovisky', 'anomaly', 'invariance, Becchi-Rouet-Stora', 'master equation', 'regularization'] | ['http://preprints.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=9405088'] | ['It is shown how the BRST quantization can be applied to a gauge invariant sector of theories with anomalously broken symmetries. This result is used to shown that shifting the anomalies to a classically trivial sector of fields (Wess-Zumino mechanism) implements the renormalizability conditions on the physical sector... | ['1994-05-16'] |
16,994 | ['eng'] | ['Bytsenko, A A', 'Kirsten, K', 'Zerbini, S'] | ['Are p-branes asymptotically black holes?'] | ['Particle Physics - Theory'] | ['membrane model, p-brane', 'black hole', 'energy levels, density', 'asymptotic behavior', 'analytic properties'] | ['http://preprints.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=9405090'] | ['An attempt is made to compare the asymptotic state density of twisted p-branes and the related state density of mass level M of a D-dimensional neutral black hole. To this aim, the explicit form of the twisted p-brane total level degeneracy is calculated. The prefactor of the degeneracy, in contrast to the leading be... | ['1994-05-16'] |
16,995 | ['eng'] | ['Strominger, A'] | ['Black holes and open strings'] | ['Particle Physics - Theory'] | ['gravitation', 'field theory, dilaton', 'coupling, matter', 'matter, coupling', 'field theory, conformal', 'dimension, 2', 'string model', 'black hole', 'radiation, Hawking', 'Wheeler-DeWitt equation', 'expansion 1/N'] | ['http://preprints.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=9405094'] | ['A model of two-dimensional dilaton gravity coupled to N matter fields is used to study black hole formation/evaporation at large N. The model may be recast as a string theory with a linear dilaton and both open and closed string tachyon backgrounds. Spacetime is then a semi-infinite open string, with the string end c... | ['1994-05-16'] |
16,996 | ['eng'] | ['Iida, T', 'Pasti, P', 'Tonin, M'] | ['Twistor--like formulation of D=10'] | ['Particle Physics - Theory'] | ['string model', 'supersymmetry', 'dimension, 10', 'dimensional reduction', 'sigma model, nonlinear', 'twistor', 'membrane model', 'dimension, 11', 'bibliography'] | ['http://preprints.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=9405074'] | ['Abstract. The twistor--like formulation of the type IIA superstring \\sigma--model in D=10 is obtained by performing a dimensional reduction of the recently proposed twistor--like action of the supermembrane in D=11. The superstring action is invariant under local, worldsheet (n,n) supersymmetry where 3\\leq n \\leq ... | ['1994-05-16'] |
16,997 | ['eng'] | ['Brustein, Ram'] | ['The role of the superstring dilaton in cosmology and particle physics'] | ['General Theoretical Physics'] | ['talk', 'string model', 'supersymmetry', 'effective action', 'gravitation', 'field theory, dilaton', 'field theory, tensor', 'gauge field theory, Yang-Mills', 'astrophysics, model'] | ['http://preprints.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=9405066'] | ['Superstring theory predicts the existence of a scalar field, the dilaton. I review some basic features of the dilaton interactions and explain their possible consequences in cosmology and particle physics.'] | ['1994-05-11'] |
16,998 | ['eng'] | ['Danielsson, U H'] | ['The scattering of strings in a black-hole background'] | ['Particle Physics - Theory'] | ['string model', 'dimension, 2', 'space-time', 'black hole', 'scattering amplitude', 'Ward identity', 'matrix model, deformation'] | ['http://preprints.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=9405052'] | ['In this paper, correlation functions of tachyons in the two-dimensional black-hole are studied. The results are shown to be consistent with the prediction of the deformed matrix model.'] | ['1994-05-11'] |
16,999 | ['eng'] | ['Bassetto, A', 'Griguolo, L'] | ['Anomalous dimensions and ghost decoupling in a perturbative approach to the generalized chiral Schwinger model'] | ['General Theoretical Physics'] | ['Schwinger model, chiral', 'dimension, 2', 'boson, propagator', 'regularization, dependence', 'perturbation theory, higher-order', 'fermion, propagator', 'ghost', 'asymptotic behavior', 'mass spectrum'] | ['http://preprints.cern.ch/cgi-bin/setlink?base=preprint&categ=hep-th&id=9405053'] | ['Abstract A generalized chiral Schwinger model is studied by means of perturbative techniques. Explicit expressions are obtained, both for bosonic and fermionic propagators, and compared to the ones derived by means of functional techniques. In particular a consistent recipe is proposed to describe the ambiguity occur... | ['1994-05-11'] |
Subsets and Splits
No community queries yet
The top public SQL queries from the community will appear here once available.