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Showing papers in "Physics Letters B in 1987"


Journal ArticleDOI
TL;DR: In this article, a hybrid (molecular dynamics/Langevin) algorithm is used to guide a Monte Carlo simulation of lattice field theory, which is especially efficient for quantum chromodynamics which contain fermionic degrees of freedom.

3,377 citations


Journal ArticleDOI
TL;DR: In this article, the effect of duality transformations on the geometries of a subclass of two-dimensional sigma-models was investigated, and it was shown that duality preserves quantum conformal invariance at order [α′]0, where α′ is the string tension parameter, provided the change induced by duality is accompanied by a shift in the dilaton field.

1,060 citations


Journal ArticleDOI
TL;DR: In this paper, the authors constructed an action for a supermembrane propagating in d = 1 supergravity background, and showed that the action is invariant under Siegel-type tranformations recently generalized by Hughes, Li and Polchinski.

904 citations


Journal ArticleDOI
TL;DR: In this article, an explicitly unitary operator for the light superstring S-matrix above planckian energies was obtained, which is dominated by graviton exchange at large impact parameters and by absorption at small impact parameters.

864 citations


Journal ArticleDOI
TL;DR: In this article, the large energy, fixed-angle, behavior of string scattering amplitudes is considered to arbitrary order in perturbation theory, and it is shown that the path integal over surfaces is dominated, in this limit, by a saddle point.

771 citations


Journal ArticleDOI
TL;DR: In this paper, the mass of the lowest spin 2 state in lattice QCD was determined, and it was shown that it is close to the low spin 0 state in the scaling region.

627 citations


Journal ArticleDOI
TL;DR: In this article, the signatures of leptoquarks with masses of order 100 GeV and couplings to quark-lepton pairs as large as gauge couplings were systematically studied.

618 citations


Journal ArticleDOI
TL;DR: In this article, it was shown that the gravitational interaction of massless higher-spin fields (s > 2) does exist at least in the first nontrivial order, despite a widespread belief.

574 citations


Journal ArticleDOI
TL;DR: In this paper, it was shown that for small quark masses, low temperatures and large volumes, the main features of the QCD partition function can be predicted on the basis of chiral symmetry.

532 citations


Journal ArticleDOI
TL;DR: In this article, the authors characterize a class of composite models in which the quarks and leptons and technifermions are built from fermions bound by strong gauge interactions, and they show that the compositeness scale must be between ≈ 1 TeV and ≈ 2.5 TeV, giving rise to observable deviations from the standard electroweak interactions.

510 citations


Journal ArticleDOI
TL;DR: The scattering process of two pointlike particles at CM energies in the order of Planck units or beyond, is very well calculable using known laws of physics, because graviton exchange dominates over all other interaction processes.

Journal ArticleDOI
TL;DR: In this paper, the ARGUS detector at the DORIS II storage ring has been used in three different ways for B0-B 0 mixing in ϒ (4S) decays.

Journal ArticleDOI
TL;DR: In this paper, a simple N = 1 supersymmetric GUT based on the group SU(5)×U(1) was proposed, which has the following virtues: the gauge group is broken down to the SU (3) C × SU (2) L × U (1) Y of the standard model using just 10, 10 Higgs representations, and doublet-triplet mass splitting problem is solved naturally by a very simple missing-partner mechanism.

Journal ArticleDOI
TL;DR: In this paper, it is conjectured and demonstrated that any supersymmetric compactification of the heterotic string with an N = 2 superconformal theory is equivalent to a compactification on a manifold of SU( N ) holonomy, and in particular an arbitrary gluing of the discrete models with c=9 gives a solvable HST on some Calabi-Yau manifold.

Journal ArticleDOI
M. J. Duff1, P.S. Howe1, T. Inami1, K.S. Stelle1
TL;DR: The type IIA superstring in ten dimensions is derived from the supermembrane in eleven dimensions by a simultaneous dimensional reduction of the world volume and the spacetime as mentioned in this paper.

Journal ArticleDOI
TL;DR: In this article, a homogeneous isotropic cosmological model driven by a scalar field with an exponential potential is studied, and it is shown that there is a solution with power-law inflation, and this solution is an attractor.

Journal ArticleDOI
TL;DR: In this paper, the consequences of the presence of gauge background fields on the torus underlying the Z-orbifold compactification of the heterotic string were studied, and it was pointed out that such Wilson lines provide a mechanism for controlling the number of chiral matter states both from twisted and untwisted sectors, as well as breaking the symmetry group.

Journal ArticleDOI
TL;DR: In this paper, the extended superconformal algebras (SCA's) in two dimensions are discussed and a general classification of the different alga's is presented.

Journal ArticleDOI
TL;DR: In this article, the Veneziano and Virasoro-Shapiro four-particle scattering amplitudes can be factored in terms of an infinite product of non-archimedean string amplitudes.

Journal ArticleDOI
TL;DR: In this paper, it was shown that if the quark masses are very small, the correlation length becomes larger than the size of the box, and that the QCD partition function reduces to a standard integral over the flavour group.

Journal ArticleDOI
Hans Günter Dosch1
TL;DR: In this article, it was shown that a model in which the QCD vacuum is simulated by a stochastic background field leads to an asymptotically linear potential.

Journal ArticleDOI
TL;DR: In this paper, the superstring multiloop amplitudes in terms of theta functions were constructed using BRST-invariance and it was shown that these poles have no physical effect for on-shell amplitudes, and that the partition functions is given by a total derivative on moduli space.

Journal ArticleDOI
TL;DR: In this article, a dynamical process is described in which the cosmological constant is netralized through the quantum creation of closed membranes by totally antisymmetric tensor and gravitational fields.

Journal ArticleDOI
TL;DR: In this paper, a class of models which extend the standard model by adding new neutral fermions is analyzed. But the authors do not consider the effect of neutrinos on the superstring.

Journal ArticleDOI
TL;DR: In this paper, it was shown that monopole condensation is responsible for confinement in U(1) lattice gauge theory and that this mechanism persists in SU(2) nonabelian gauge theories.

Journal ArticleDOI
TL;DR: In this article, the critical properties of exactly soluble Ising model on a planar random dynamical lattice representing a regularization of the zero-dimensional string with internal fermions were investigated.

Journal ArticleDOI
TL;DR: In this article, the authors constructed several N = 1 supersymmetric three-generation models with SU(3)×SU(2)×U(1)n gauge symmetry, obtained from the compactification of the heterotic string in the presence of constant gauge-background fields.

Journal ArticleDOI
TL;DR: In this paper, a full set of factorized, dual, crossing-symmetric tree-level N-point amplitudes is constructed for non-archimedean closed strings.

Journal ArticleDOI
TL;DR: In this article, it was shown that the extension of the spacetime supersymmetric Green-Schwarz covariant action p -dimensional extended objects (p-branes) is possible if and only if the on-shell p-dimensional Bose and Fermi degrees of freedom are equal.

Journal ArticleDOI
TL;DR: In this paper, a new technique for generating the baryon asymmetry of the universe is discussed, using the natural CPT non-invariance of universe during its early history.