Showing papers in "Physics Letters B in 1986"

TL;DR: In this article, a mechanism to generate cosmological baryon number excess without resorting to grand unified theories is proposed, where the lepton number excess originating from Majorana mass terms may transform into the number excess through the unsuppressed baryone number violation of electroweak processes at high temperatures.

TL;DR: In this paper, the temperature dependence of the screening radius, as obtained from lattice QCD, is compared with the J/ψ radius calculated in charmomium models, and the feasibility to detect this effect clearly in the dilepton mass spectrum is examined.

TL;DR: If new particles are gauged by a new U(1) then their electromagnetic charges may be shifted by a calculable amount as mentioned in this paper, which is the case in the case of the current article.

TL;DR: In this paper, the (p, q)-type anti-de Sitter supergravity theories associated with the three-dimensional adS supergroups OSp (p|2; R )⊗ OSp(q|2, R ) were constructed.

TL;DR: A renormalization group strategy for the study of bound states in field theory is developed in this paper, which is completely different from conventional analyses, based upon the Bethe-Salpeter equation, and it is far simpler

TL;DR: In this article, it was shown that infinitely many heterotic string theories exist in uncompactified dimensions less than 10, that are one-loop finite (for massless external legs).

TL;DR: In this paper, a new version of the non-chiral N = 2a supergravity in ten dimensions is obtained, in which the two-index tensor field of the theory "eats" the single vector field and acquires a mass in a Higgs-type mechanism.

TL;DR: In this paper, it is shown that large-scale quantum fluctuations of the scalar field generated in the chaotic-inflation scenario lead to an infinite process of self-reproduction of inflationary mini-universe.

TL;DR: In this article, it was shown that at somewhat higher densities one finds a charged kaon condensate, driven to a large extent by the stgma term interaction with baryons.

TL;DR: In this paper, the explicit regularization of the Weyl fermion current leading to the anomalous commutation relation of the Gauss law constraint is established and the modified form of functional integral quantization for this model is proposed.

TL;DR: In this paper, a background dilaton condensate is introduced, such that the strings propagate in a background geometry which to leading order is equivalent to the de Sitter space.

TL;DR: In this article, determinant formulae are presented for the periodic, antiperiodic and twisted N = 2 superconformal algebras in two dimensions, and a classification is derived of the unitary highest weight representations.

TL;DR: In this paper, it is shown that the no hair conjecture fails even in isotropic cosmological models if the strong energy conditions is relaxed, and the relevance of the initial value structure of the cosmology problem for inflationary explanations of its present structure is discussed.

TL;DR: In this article, a generalisation of Birkhoff's theorem in the case of supersymmetric string theory modified by a Gauss-Bonnet term is proved, and the only spherically symmetric solutions of the theory are shown to be generalisations of the Reissner-Nordstrom and Robinson-Bertotti solutions.

TL;DR: In this article, the widths of ultra-heavy quarks that can decay into W, Z or Higgs bosons are discussed and the results of the jet evolution are investigated.

TL;DR: In this paper, the authors discuss the low energy properties of the invisible axion in an effective field theory language and study the most general model in which the strong CP problem is solved by a Peccei-Quinn symmetry spontaneously broken at a large scale.

TL;DR: A superspace calculation of the four-loop βT-function for two-dimensional N = 1, 2 supersymmetric non-linear αG-models is presented in this paper.

TL;DR: In this paper, the p -loop amplitude of closed oriented bosonic strings in 26 dimensions is considered and the integration measure is a measure on the moduli space M p of Riemann surfaces of genus p.

TL;DR: In this paper, the possibility of a new constraint on the Peccei-Quinn symmetry breaking scale arising from the decay of cosmic axion strings is discussed, which is a constraint that is related to the one proposed in this paper.

TL;DR: In this article, a simple explanation is given why the instanton amplitude is exhausted by one loop whilst in the standard supergraph technique the effective action contains terms of all orders in the coupling constant and an exact relation between the Gell-Mann-Low function and the anomalous dimensions of matter superfields stemming from instanton calculus is presented.

TL;DR: In this paper, it was shown that the associated coupling constant, which is dimensionless, is asymptotically free in the ultraviolet, and that the same term can be found in biophysical membranes and micro-emulsions.

TL;DR: In this article, it was shown that the IR asymptotics of an arbitrary hard process of perturbative QCD can be factorized out into the superposition of vacuum averages of path-ordered exponentials, the IR singularities of which are shown to be in a one-to-one correspondence with the UV ones.

TL;DR: In this paper, a model of the universe with an additional term Λ ( x ) g μν in the energymomentum tensor is motivated and presented, which is completely determined by the assumption that the energy density ofthe universe equals its critical value.

TL;DR: In this paper, conditions on the background fields from requiring finiteness, conformal invariance, anomally cancellation and unbroken supersymmetry are derived and compared, and consistency between these conditions fixes an ambiguity in the torsion Bianchi identity.

TL;DR: By modifying the definition of the fermion number projection in the E 8 × E 8 heterotic superstring theory in a manner consistent with modular invariance and factorization, a tachyon-free string theory is obtained without spacetime supersymmetry as mentioned in this paper.

TL;DR: In this article, the nucleons are represented as Gaussian wave packets in configuration and momentum space, and they interact via a combination of a Skyrme type potential and a Uehling-Uhlenbeck two-body scattering mechanism.

TL;DR: Very light or massless spin-zero particles coupled to two photons, such as axions or genuine Goldstone bosons, induce small changes in the polarization state of a laser beam travelling in a magnetic field.

TL;DR: In this article, it was shown that the dilaton, axion, Polonyi and gravitino problems are essentially equivalent in a wide class of superstring models, and that no problems arise with cosmological nucleosynthesis if m 3 2 ⪆ 10 4 GeV, or with baryosynthesis when m 2 2 ⫆ 10 13 GeV.

TL;DR: In this paper, the vanishing four-loop β-function for the N = 1 supersymmetric non-linear σ-model in two dimensions was constructed whose equations of motion coincide with the condition of vanishing fourloop β function.

TL;DR: In this paper, a search for decays of heavy neutrinos was conducted by the CHARM Collaboration in a prompt neutrino beam produced by dumping 400 GeV protons in a Cu target.